Background

[0001] Fluid level detectors can be utilized to determine a fluid level within a container. In some examples, fluid detectors can utilize a conductive liquid level sensor that utilizes a level of conductivity generated by a particular quantity of liquid surrounding the fluid detector. For example, a relatively higher level of liquid can correspond to a first level of conductivity and a relatively lower level of liquid can correspond to a second level of conductivity. In this way, the fluid detector can determine the level of a liquid within a container.

Brief Description of the Drawings

[0002] Figure 1 is an example system for a substance level detector in accordance with the present disclosure.

[0003] Figure 2 is an example system for a substance level detector in accordance with the present disclosure.

[0004] Figure 3 is an example system for a substance level detector in accordance with the present disclosure.

[0005] Figure 4 is an example system for a substance level gauge for different tilt levels of a reservoir in accordance with the present disclosure.

Detailed Description

[0006] In some examples, a printing device can generate an image such as text, pictures, or other features on a print medium. As used herein, a print medium can include a material that can receive a print substance from a printing device. For example, a print medium can include, but is not limited to paper, plastic, metal, among other materials. In some examples, the printing device can deposit the print substance on to specific locations of a print medium to generate the image. As used herein, a print substance can include a compound that can be deposited on the print medium by the printing device. For example, the print substance can include ink, toner, three-dimensional (3D) print ink, and/or other materials that can be deposited on a print medium to generate an image.

[0007] In some examples, the printing device can utilize a reservoir to store the print substance. For example, the reservoir can be an enclosure (e.g., substance enclosure, print substance enclosure, etc.) that can receive and enclose ink that can be utilized by an inkjet printing device. In this example, the reservoir can be filled to store additional print substance or store a relatively large quantity of print substance for the printing device. In this example, the reservoir can be drained to reclaim unused print substance at the end of a workable life of a printing device. In this way, the reservoir can be utilized to provide continuous print substance with relatively less waste compared to previous systems. Although the examples described herein reference reservoirs utilized by printing devices, examples of the present disclosure are not so limited. For example, the reservoirs described herein can be utilized by other types of devices or systems to store different substances within an enclosure of the reservoir.

[0008] In some examples, the reservoir can include sensors that can be utilized to determine a height or height level of the substance within the reservoir at a particular location (e.g., a location where the sensor is positioned, etc.). For example, the reservoir can utilize a floating sensor that floats to a level or height level of the substance within the reservoir. In this example, the floating sensor can be a height sensor as described further herein. In some examples, a height sensor can be utilized to identify a quantity of substance within the reservoir based on the height or height level of the substance within the reservoir. However, these types of height sensors can be impacted when the reservoir is tilted or positioned at an angle. For example, the reservoir can be tilted toward the height sensor. This can result in the quantity of substance being identified by the height senor that is greater than the actual quantity of substance within the reservoir. In a similar example, the reservoir can be tilted away from the height sensor. In this example, a quantity identified by the height sensor can be less than the actual quantity of substance within the reservoir. [0009] The present disclosure relates to substance level detectors that can be utilized to compensate for tilt levels (e.g., tilt angles, tilt directions, etc.) associated with reservoirs in order to provide a more consistent and accurate calculation of the quantity of substance within a reservoir despite the tilt level of the reservoir. The present disclosure can utilize a tilt sensor in combination with a height sensor to determine a more accurate calculation of the quantity of substance within the reservoir. For example, the present disclosure can utilize a tilt sensor to determine an angle of tilt and/or a direction of tilt. In this example, the present disclosure can utilize the tilt sensor data, height sensor data, and/or internal geometry of the reservoir to determine the quantity of substance within the reservoir.

[0010] The figures herein follow a numbering convention in which the first digit corresponds to the drawing figure number and the remaining digits identify an element or component in the drawing. Elements shown in the various figures herein may be capable of being added, exchanged, and/or eliminated so as to provide a number of additional examples of the present disclosure. In addition, the proportion and the relative scale of the elements provided in the figures are intended to illustrate the examples of the present disclosure and should not be taken in a limiting sense.

[0011] Figure 1 is an example system 100 for a substance level detector in accordance with the present disclosure. In some examples, the system 100 can be a part of a print substance detection system positioned within a printing device. For example, the system 100 can be part of an inkjet printing device that can utilize a substance 106 (e.g., print substance, ink, toner, etc.) stored within a substance reservoir 102. Although a substance reservoir 102 that is capable of storing a print substance is illustrated, examples of the present disclosure are not so limited. For example, other types of enclosures that are utilized to store materials could be implemented by the systems and devices described herein. In some examples, the substance reservoir 102 can be an enclosure or container that can receive and store the substance 106. As described herein, the substance 106 can be a compound that can be utilized by a printing device to generate images on a print medium. These compounds can include, but are not limited to, ink, toner, three-dimensional printing fluid, among other compounds. For example, the substance 106 can be an ink substance that can be deposited on a print medium to generate an image on the print medium. [0012] In some examples, the system 100 can include a height sensor 104 to determine a height of the substance 106 within the reservoir 102. In some examples, the height sensor 104 can include a plurality of sensor pins that can include a first pin to provide a signal into the substance 106 and a second pin to measure the signal to determine a height of the substance 106 within the reservoir 102. In other examples, the height sensor 104 can be a float sensor that includes a floating device (e.g., device that floats to a surface of the substance 106, etc.) that can provide a height of the substance 106 within the reservoir 102. In other examples, other types of height sensors can be utilized to determine a height of the substance 106 within the reservoir 102 at a location of the height sensor 104. For example, height sensors such as capacitive sensors, harmonic sensors, ultrasonic sensors, and/or time of flight sensors can be utilized, among other types of sensors, to determine a height of the substance 106 within the reservoir 102.

[0013] In previous systems, the height sensor 104 can be used without other sensors to determine the quantity of the substance 106 within the reservoir 102 based on the determined height. For example, the height sensor 104 can determine the quantity of substance 106 within the reservoir 102 based on the determined height and a presumption that the reservoir 102 is level with respect to gravity. However, the height sensor 104 can determine an incorrect quantity of substance 106 when the reservoir 102 is tilted or not level with respect to gravity. For example, the reservoir 102 can be tilted toward the height sensor 104, which can make it appear to the height sensor 104 that the level or height of the substance 106 is greater than an actual quantity of substance 106 within the reservoir 102. In a similar example, the reservoir 102 can be tilted away from the height sensor 104, which can make it appear to the height sensor 104 that the level or height of the substance 106 is less than an actual quantity of substance 106 within the reservoir 102.

[0014] In contrast, the system 100 can include a tilt sensor 108 to determine a tilt angle and/or tilt direction of the reservoir 102. For example, the tilt sensor 108 can be a gyroscope sensor that can be utilized to determine the tilt angle and/or tilt direction of the reservoir 102. A gyroscope sensor is used herein as an example, however the disclosure is not limited to gyroscope sensors. For example, other types of tilt sensors (e.g., accelerometer sensor, etc.) can be utilized to determine the tilt angle and/or tilt direction of the reservoir 102. In some examples, the tilt sensor 108 can be positioned on an exterior portion of the reservoir 102. In other examples, the tilt sensor 108 can be conductive sensors positioned within the reservoir 102. In this way, the tilt angle and/or tilt direction can be utilized to compensate for the altered position of the print substance 106 due to the tilt angle and/or tilt direction.

[0015] In some examples, the system 100 can include a controller 110 communicatively coupled to a tilt sensor 108, height sensor 104, and/or other components of the reservoir 102. In some examples, the controller 110 can be utilized to control particular functions of a printing device that includes or is coupled to the substance reservoir 102. In some examples, the controller 110 can be connected to the tilt sensor 108 and/or height sensor 104 through a communication path 118. For example, the controller 110 can be connected to the tilt sensor 108 and/or height sensor 104 through a wired or wireless communication connection. In some examples, the communication path 118 can be utilized by the controller 110 to determine a height or height level of the substance 106 within the reservoir 102 based on the height sensor 104, and/or determine a tilt angle and/or tilt direction based on the tilt sensor 108. In some examples, the height of the substance 106, tilt angle, tilt direction, and/or internal geometry can be utilized by the controller 110 to determine a quantity of substance 106 within the reservoir 102.

[0016] In some examples, the controller 110 can include a processing resource 112 and/or a memory resource 114 storing instructions to perform particular functions. A processing resource 112, as used herein, can include a number of processing resources capable of executing instructions stored by a memory resource 114. The instructions (e.g., machine-readable instructions (MRI), computer-readable instructions (CRI), etc.) can include instructions stored on the memory resource 114 and executable by the processing resource 112 to perform or implement a particular function. The memory resource 114, as used herein, can include a number of memory components capable of storing non-transitory instructions that can be executed by the processing resource 112.

[0017] The memory resource 114 can be in communication with the processing resource 112 via a communication link (e.g., communication path). The communication link can be local or remote to an electronic device associated with the processing resource 112. The memory resource 114 includes instructions 116. The memory resource 114 can include more or fewer instructions than illustrated to perform the various functions described herein. In some examples, instructions (e.g., software, firmware, etc.) can be downloaded and stored in memory resource 114 (e.g., MRM) as well as a hard-wired program (e.g., logic), among other possibilities. In other examples, the controller 110 can be hardware, such as an application-specific integrated circuit (ASIC), that can include instructions to perform particular functions.

[0018] The controller 110 can include instructions 116, that when executed by a processing resource 112 can determine a quantity of the substance 106 within the reservoir 102 based on the height of the substance 106 and the tilt level of the reservoir 102. As described herein, the controller 110 can determine the height of the substance 106 based on a reading or signal from the height sensor 104. For example, the height sensor 104 can provide a particular voltage reading to the controller 110 and the controller can utilize the voltage reading to determine the height of the substance 106 within the reservoir 102 at the location of the height sensor 104.

[0019] In some examples, the controller 110 can utilize the voltage reading from the height sensor 104 along with a tilt level from the tilt sensor 108 to determine the quantity of substance 106 within the reservoir 102. For example, the voltage reading can correspond to a level or height level of the substance 106 within the reservoir 102 at the area of the height sensor 104 and the tilt level can be utilized to compensate for a tilt angle and/or tilt direction of the reservoir 102. In some examples, the controller 110 can utilize a table of different voltages at different tilt levels to determine a corresponding quantity of substance 106 within the reservoir 102.

[0020] In some examples, the controller 110 can include instructions, that when executed by a processing resource 112 can determine a volume and shape of the reservoir 102 and determine the quantity of the substance 106 within the reservoir 102 based on the volume and shape of the reservoir 102. In some examples, determining the volume and shape of the reservoir 102 can include determining a volume and shape of the reservoir 102 that includes substance 106. For example, the controller 110 can receive a height level of the substance 106 within the reservoir 102 and determine the volume and shape of the portion of the reservoir 102 that is filled with substance 106. In some examples, the volume and shape of the reservoir 102 can be stored in the memory resource 114 of the controller 110. In some examples, the volume and shape of the reservoir 102 can be based on a plurality of metrics 120-1, 120-2, 120-3. In some examples, the plurality of metrics 120-1, 120-2, 120-3 can correspond to a height, width, and/or length of the reservoir 102. For example, the metric 120-1 can correspond to a length of the reservoir 102, the metric 120-2 can correspond to a height of the reservoir 102, and the metric 120-3 can correspond to a width of the reservoir 102. In some examples, the plurality of metrics 120-1, 120-2, 120-3 can be different for different shapes and/or geometries. For example, the reservoir 102 may not be a rectangular shape as illustrated in Figure 1. In this example, the plurality of metrics 120-1, 120-2, 120-3 may be different when the reservoir 102 is a non-rectangular shape (e.g., cube shaped, pyramidal shape, polygonal shape, etc.).

[0021] Although three metrics 120-1, 120-2, 120-3 are illustrated in Figure 1, a plurality of additional metrics can be utilized to identify the internal geometry of the reservoir 102. In some examples, the plurality of metrics 120-1, 120-2, 120-3 can be determined based on a model or type of the reservoir 102. For example, a manufacturer of the reservoir 102 can include specifications that identify the plurality of metrics 120-1, 120-2, 120-3 that can be utilized by the controller 110 to determine the volume and shape of the reservoir 102, which can be utilized to determine how the tilt level will affect the height sensor 104 determination of the level or height level of the substance 106 within the reservoir 102. In this way, the controller 110 can be utilized to determine a more accurate quantity of the substance 106 within the reservoir 102 compared to previous systems and methods.

[0022] Figure 2 is an example system 200 for a substance level detector in accordance with the present disclosure. In some examples, the system 200 can include the same or similar elements as the system 100 as referenced in Figure 1. For example, the system 200 can include a substance reservoir 202 that can be utilized to store a substance 206. In addition, the system 200 can include a height sensor 204 to determine a height level of the substance 206 and/or a tilt sensor 208 to determine a tilt level of the substance reservoir 202. As described herein, the height sensor 204 and the tilt sensor 208 can be utilized to determine a quantity of the print substance 206 within the reservoir despite the tilt level of the substance reservoir 202.

[0023] In some examples, the system 200 can include a controller 210. In some examples, the controller 210 can include the same or similar elements as controller 110 as referenced in Figure 1. For example, the controller 210 can be a computing device that includes a processing resource 212 and a memory resource 214. As described herein, the memory resource 214 can include a non-transitory computer readable medium that can store instructions (e.g., instructions 222, 224, etc.) that can be executed by the processing resource 212 to perform particular functions. In some examples, the controller 210 can be communicatively coupled to the height sensor 204, tilt sensor 208, and/or other components of the substance reservoir 202. In some examples, the controller 210 can receive signals (e.g., voltage, messages, etc.) from the height sensor 204, tilt sensor 208, and/or other components through the communication path 218.

[0024] The controller 210 can include instructions 222, that when executed by a processing resource 212 can determine an internal geometry of the substance reservoir 202. As described herein, the internal geometry of the substance reservoir 202 can include the internal geometry of the entire reservoir 202 and/or the internal geometry of a portion of the reservoir 202 that includes the substance 206. As used herein, the internal geometry of the substance reservoir 202 can include a plurality of dimensions or metrics 220-1, 220-2, 220-3 that define the internal boundaries of the substance reservoir 202. In some examples, the plurality of metrics 220-1, 220-2, 220-3 can be determined based on a manufacturer’s specification of the substance reservoir 202. In some examples, the internal geometry may be non-symmetrical.

For example, the width at a first location can be different than a width at a second location. In addition, a length at a first location can be different a length at a second location. Furthermore, a height at a first location can be different than a height at a second location. For this reason, different tilt angles and/or different tilt directions can affect the fluid height of the substance 206 at the location of the height sensor 204 differently.

[0025] The controller 210 can include instructions 224, that when executed by a processing resource 212 can determine a quantity of the substance 206 within the substance reservoir 202 based on the internal geometry, height of the substance 206 at a particular location, tilt angle, and tilt direction of the substance reservoir 202. As described herein, the quantity of substance 206 can be more accurately determined when the internal geometry, tilt angle, and/or tilt direction of the substance reservoir 202 is utilized.

[0026] As described herein, the height sensor 204 can be positioned at a particular location within the substance reservoir 202. For example, the height sensor 204 can be positioned on a first side (e.g., first end, etc.) of the substance reservoir 202. In this example, the internal geometry on the first side can be different than the second side, which can affect the height level detected by the height sensor 204 when the substance reservoir 202 is positioned at different tilt angles and/or different tilt directions. In these examples, a particular location of the height sensor 204 can be determined to ensure that the effect on the height of the substance 206 from the tilt angle and/or tilt direction is correctly identified. For example, the height sensor 204 can be positioned on a right side of the substance reservoir 202 as illustrated in Figure 2. In this example, a tilt direction toward the right side of the substance reservoir 202 can increase an observed height level of the substance 206. As used herein, the observed height level of the substance 206 can include a determined height of the substance 206 before considering the tilt level of the substance reservoir 202. However, if the height sensor 204 was positioned on the left side of the substance reservoir 202 as illustrated in Figure 2, the observed height level of the substance 206 would be decreased. Thus, the location of the height sensor 204 can be utilized to determine the quantity of substance 206 along with the observed height level, tilt angle, tilt direction, and/or internal geometry of the substance reservoir 202.

[0027] Figure 3 is an example system 300 for a substance level detector in accordance with the present disclosure. In some examples, the system 300 can include the same or similar elements as the system 200 as referenced in Figure 2, and/or system 100 as referenced in Figure 1. For example, the system 300 can include a substance reservoir 302 that can be utilized to store a print substance 306. As described herein, a print substance 306 can include a substance that can be utilized by a printing device to generate images on a print medium (e.g., paper, etc.). In addition, the system 300 can include a height sensor 304 to determine a height level of the print substance 306 and/or a tilt sensor 308 to determine a tilt level of the substance reservoir 302 or enclosure of the substance reservoir 302. As described herein, the height sensor 304 and the tilt sensor 308 can be utilized to determine a quantity of the print substance 306 within the reservoir despite the tilt level of the substance reservoir 302.

[0028] In some examples, the system 300 can include a controller 310. In some examples, the controller 310 can include the same or similar elements as controller 210 as referenced in Figure 2 and/or controller 110 as referenced in Figure 1. For example, the controller 310 can be a computing device that includes a processing resource 312 and a memory resource 314. As described herein, the memory resource 314 can include a non-transitory computer readable medium that can store instructions (e.g., instructions 332, 334, etc.) that can be executed by the processing resource 312 to perform particular functions. In some examples, the controller 310 can be communicatively coupled to the height sensor 304, tilt sensor 308, and/or other components of the substance reservoir 302. In some examples, the controller 310 can receive signals (e.g., voltage, messages, etc.) from the height sensor 304, tilt sensor 308, and/or other components through the communication path 318.

[0029] The controller 310 can include instructions 332, that when executed by a processing resource 312 can determine an internal geometry of the enclosure of the substance reservoir 302. In some examples, the internal geometry that is used to determine the quantity of the print substance 306 can be a portion of the enclosure of the substance reservoir 302 that includes print substance 306. In other examples, the entire internal geometry of the substance reservoir 302 in combination with the height level of the print substance 306 can be utilized to determine the quantity of print substance 306 within the enclosure of the substance reservoir 302. As described herein, the internal geometry of the substance reservoir 302 can include a plurality of metrics 320-1, 320-2, 320-3 that defines the internal area of the substance reservoir 302 that is capable of storing the print substance 306. In some examples, the substance reservoir 302 can be non-symmetrical, which can alter the way the print substance 306 behaves when the substance reservoir 302 is positioned at different tilt angles and/or different tilt directions. In this way, the internal geometry can be utilized to determine and/or predict how the print substance 306 will increase or decrease in height at the location of the height sensor 304.

[0030] The controller 310 can include instructions 334, that when executed by a processing resource 312 can calculate a fill percentage of the enclosure of the substance reservoir 302 based on the height of the print substance 306 at the location 305, the angle and direction of tilt, and the internal geometry of the enclosure of the substance reservoir 302. As used herein, a fill percentage of the enclosure of the substance reservoir 302 can be a value of how full or empty the enclosure of the substance reservoir 302 is with the print substance 306. For example, the quantity of print substance 306 can fill a particular percentage of the total volume or threshold volume for the enclosure of the substance reservoir 302. In this example, the fill percentage can correspond to a percentage of volume available for additional print substance or a percentage of volume occupied by the print substance 306 within the enclosure of the substance reservoir 302.

[0031] In some examples, the fill percentage can be displayed by a substance gauge (e.g., substance level gauge 442 as referenced in Figure 4, etc.) coupled to a device utilizing the print substance 306. Previous devices and systems could display the value provided by the height sensor 304 without considering the tilt value or internal geometry of the enclosure of the substance reservoir, which could result in inaccurate fill percentages displayed on the substance gauge.

[0032] As described herein, the location 305 of the height sensor 304 can be utilized to determine and/or predict increases or decreases in the height of the print substance 306 for a plurality of different tilt angles and tilt directions. For example, the increases or decreases of the print substance 306 can be different at the location 305 compared to other locations of the enclosure of the substance reservoir 302. That is, a placement position or location 305 of the height sensor 304 can produce different accuracies for different tilt angles and/or tilt directions. In this way, the controller 310 can receive the location 305 and/or determine the location 305 of the height sensor 304 and calculate the quantity of print substance 306 utilizing the location 305 of the height sensor 304.

[0033] In some examples, the controller 310 can include instructions, that when executed by a processing resource 312 can alter a function of a printing device based on the angle and direction of tilt and the internal geometry of the enclosure. For example, the controller 310 can enable particular functions and/or disable particular functions of the printing device based on the angle and direction of tilt for a particular substance reservoir 302 with a particular internal geometry. In some examples, the controller 310 can disable filling operations associated with the substance reservoir 302 based on the height of the print substance 306 at the location 305 and the angle and direction of tilt. For example, a filling port can be positioned near a side that is exceeding a height threshold. In this example, the controller 310 can disable filling operations to ensure that the print substance 306 does not further exceed the height threshold and lead to possible damage.

[0034] In some examples, the controller 310 can include instructions, that when executed by a processing resource 312 can disable printing operations associated with the substance reservoir 302 based on the angle and direction of tilt. In some examples, the controller 310 can disable printing operations to ensure that the print substance 306 within the substance reservoir 302 is not altered (e.g., consumed, drained, added, etc.) due to the printing operations. For example, additional printing operations can result in the print substance 306 being removed from the substance reservoir 302 if the printing device needs additional print substance 306.

[0035] In some examples, the controller 310 can include instructions, that when executed by a processing resource 312 can alter a function of a pump coupled to the substance reservoir 302 based on the angle of tilt, direction of tilt, and a location of a pumping location within the substance reservoir 302. As described herein, the angle of tilt and tilt direction can alter a height of the print substance 306 at positions within the substance reservoir 302. In this way, a height of the printing substance can be determined at a pumping location by the controller 310 to ensure that the height of print substance 306 is above the pumping location. As used herein, a pumping location can be a location within the substance reservoir 302 where the print substance 306 is removed from the substance reservoir 302 by a pump or pumping mechanisms. In this way, the pumping location does not fall below a height threshold of print substance 306, which could introduce air or other gasses into the pumping lines. In some examples, air in the pumping lines can cause damage to the printing device.

[0036] In some examples, the controller 310 can include instructions, that when executed by a processing resource 312 can generate a notification based on the height of the print substance 306 and/or tilt level of the substance reservoir 302 reaches and/or exceeds a threshold. In some examples, the print substance 306 can exceed a threshold height level for the substance reservoir 302, which can cause leaks or damage to the substance reservoir 302. As described herein, the threshold height level can be exceeded at the location 305 of the height sensor 304 or a different location within the substance reservoir 302. In some examples, the height at the different location can be calculated utilizing the height at the location 305, tilt angle, tilt direction, and/or determined quantity of print substance 306 within the substance reservoir 302. The calculated height at the different location can be utilized to determine if the print substance 306 at the different location exceeds the threshold height level for the different location. [0037] In some examples, the tilt level of the substance reservoir 302 can exceed a threshold angle, which can indicate to the controller 310 that continued operation of a pump or other device may be damaged. In some examples, the printing device can include a tilt level threshold. When the tilt level threshold is exceeded, the printing device may not be able to perform one or more functions (e.g., depositing print substance 306 on to a print medium, stacking print medium, performing finishing functions on print medium, etc.). Thus, when the controller 310 determines that a threshold from the height of the print substance 306 or a threshold from the angle of the tilt level has been reached and/or exceeded, the controller 310 can send a notification to a user device or display of the printing device. In some examples, the controller 310 can disable devices or components of the printing device in response to a threshold being exceeded or met. For example, the printing device can disable a pump when a threshold is exceeded or met.

[0038] In some examples, the controller 310 can include instructions, that when executed by a processing resource 312 can provide the quantity of the print substance 306 within the substance reservoir 302 to reflect a particular value on a substance gauge for the substance reservoir 302. For example, the controller 310 can provide a fill percentage of the substance reservoir 302 to a substance level gauge, which will be described further in reference to Figure 4.

[0039] Figure 4 is an example system 400 for a substance level gauge 442 for different tilt levels of a reservoir in accordance with the present disclosure. In some examples, the system 400 can include the same or similar elements as the system 300 as referenced in Figure 3, the system 200 as referenced in Figure 2, and/or system 100 as referenced in Figure 1. For example, the system 400 can illustrate a substance reservoir 402-1, 402-2, 402-3 that can be utilized to store a substance 406-1, 406-2, 406-3. Figure 4 illustrates the substance reservoir 402-1 , 402-2, 402-3 at different tilt levels. For example, substance reservoir 402-1 can illustrate a substantially level tilt level with respect to gravity (e.g., substantially level with respect to gravity, etc.), substance reservoir 402-2 can illustrate a tilt level that includes a tilt direction to the left as illustrated in Figure 4, and substance reservoir 402-3 can illustrate a tilt level that includes a tilt direction to the right as illustrated in Figure 4.

[0040] In addition, the system 400 can include a height sensor 404-1 , 404-2, 404-3 to determine a height level of the substance 406-1, 406-2, 406-3 and/or a tilt sensor 408-1 , 408-2, 408-3 to determine a tilt level of the substance reservoir 402-1 , 402-2, 402-3 or enclosure of the substance reservoir 402-1, 402-2, 402-3. As described herein, the height sensor 404-1 , 404-2, 404-3 and the tilt sensor 408-1 , 408-2, 408-3 can be utilized to determine a quantity of the substance 406-1, 406-2, 406-3 within the substance reservoir 402-1 , 402-2, 402-3 despite the tilt level of the substance reservoir 402-1, 402-2, 402-3.

[0041] In some examples, Figure 4 can illustrate the substance reservoir 402- 1, 402-2, 402-3 at different tilt levels with the same or similar quantity of substance 406-1, 406-2, 406-3. For example, the substance 406-1 within the substance reservoir 402-1 can be at a first height when the substance reservoir 402-1 is substantially level with respect to gravity. In this example, the tilt sensor 408-1 can determine that the substance reservoir 402-1 is substantially level, the height sensor 404-1 can determine the height level of the substance 406-1 , and a controller can determine the fill percentage based on the tilt level, height level, and/or internal geometry of the substance reservoir 402-1. In this example, the fill percentage can be provided to the substance level gauge 442-1.

[0042] In another example, the substance 406-2 within the substance reservoir 402-2 can be at a second height when the substance reservoir 402-2 has a tilt level that includes a tilt direction toward the left or away from the height sensor 404-2. In this example, the tilt sensor 408-2 can determine that the substance reservoir 402-2 includes the tilt level, the height sensor 404-2 can determine the height level of the substance 406-2, and a controller can determine the fill percentage based on the tilt level, height level, and/or internal geometry of the substance reservoir 402-2. As illustrated in Figure 4, the height of the substance 406-2 can seem relatively lower than the height of the substance 406-1 at the location of the height sensor 404-1 , 404-2. In this example, the fill percentage can be provided to the substance level gauge 442-2.

[0043] In another example, the substance 406-3 within the substance reservoir 402-3 can be at a third height when the substance reservoir 402-3 has a tilt level that includes a tilt direction toward the right or toward the height sensor 404-3.

In this example, the tilt sensor 408-3 can determine that the substance reservoir 402- 3 includes the tilt level, the height sensor 404-3 can determine the height level of the substance 406-3, and a controller can determine the fill percentage based on the tilt level, height level, and/or internal geometry of the substance reservoir 402-3. As illustrated in Figure 4, the height of the substance 406-3 can seem relatively higher than the height of the substance 406-1 at the location of the height sensor 404-1, 404-3. In this example, the fill percentage can be provided to the substance level gauge 442-2.

[0044] Although Figure 4 illustrates a tilt direction to the left as illustrated by the substance reservoir 402-2 and a tilt direction to the right as illustrated by the substance reservoir 402-3, the present disclosure is not limited to these tilt directions. For example, the tilt direction can be into the page as illustrated by Figure 4. In these examples, the tilt direction can alter the level of the substance 406-1, 406-2, 406-3 differently than the right or left tilt direction. In addition, the tilt direction can be out of the page as illustrated by Figure 4. In these examples, the tilt direction can alter the level of the substance 406-1 , 406-2, 406-3 differently than the right or left tilt direction. In some examples, the tilt direction into the page can have an opposite effect on the substance 406-1 , 406-2, 406-3 as the tilt direction out of the page in a similar way that the tilt direction to the right has an opposite effect on the substance 406-1 , 406-2, 406-3 compared to the tilt direction to the left.

[0045] In some examples, the system 400 can include the substance level gauge 442 coupled to a device that utilizes the substance 406-1 , 406-2, 406-3. For example, the substance level gauge 442 can be coupled to a printing device that can utilize a print substance. In some examples, the substance level gauge 442 can display the fill percentage of the substance reservoir 402-1 , 402-2, 402-3, which can provide a user a more accurate reading compared to previous systems and methods. For example, the substance level gauge 442-2 would make it appear that the substance reservoir 402-2 is relatively low even though the actual quantity of substance 406-2 is the same or similar quantity as print substance 406-1. In a similar example, the substance level gauge 442-3 would make it appear that the substance reservoir 402-3 is relatively high even though the actual quantity of substance 406-3 is the same or similar quantity as print substance 406-1. Thus, the system 400 can provide consistent fill percentages for a substance reservoir 402-1, 402-2, 402-3 despite the tilt angle of the substance reservoir 402-1 , 402-2, 402-3 by utilizing the tilt angle, tilt direction, internal geometry, and/or height level at the height sensor 404-1 , 404-2, 404-3.

[0046] The above specification, examples and data provide a description of the method and applications and use of the system and method of the present disclosure. Since many examples can be made without departing from the spirit and scope of the system and method of the present disclosure, this specification merely sets forth some of the many possible example configurations and implementations.