how to increase sensitivity of capacitive sensor

It is not necessary that the sensitivity will increase by increasing the surface area. At VTH 955, the relaxation oscillator allows the accumulated charge at node 955 to discharge (e.g., the capacitor 951 to “relax” back to the ground potential) and then the process repeats itself. Embodiments of a method, apparatus, and system for implementing a capacitive sense user interface are described herein. The illustrated embodiment of linear slider array 415 includes an array of CAP sensors 420A-320G (collectively 420). A pulse width modulator (PWM) 921 is clocked for a fixed period by a derivative of the system clock, VC3 926 (which is a divider from system clock 925, e.g., 24 MHz). This technology is often referred to as capacitive touch-sense technology; however, this term is a misguided term since the user need not actually physically touch the interface to operate the technology. Discrete scans can be performed quicker than group scans since the capacitive load of a single CAP sensor 320 is inherently smaller than a group of CAP sensors 320. determining an approximate location of the user interaction based on the scanning. I/O interface 310 links each CAP sensor 320 to capacitance sensor circuit 305. 1A illustrates a conventional circular slider interface having a center mechanical button. The approximate location determined via the quick discrete scan may limit the possible location of the user interaction to a portion of circular slider array 315, such as for example, the top half, the top quarter, etc. A non-transitory machine-readable medium that provides instructions that when executed by a processing device cause the processing device to: electrically couple, by the processing device, capacitance sense electrodes of a capacitive sense array into a first group of a plurality of groups, each of the plurality of groups comprising two or more capacitance sense electrodes, wherein the capacitive sense array is configured to sense capacitance indicative of a touch proximate the capacitive sense array; measure, at a first time, a first single value of a combined capacitance of the first group comprising the two or more capacitance sense electrodes; electrically couple the capacitance sense electrodes of the capacitive sense array into a second group of the plurality of groups, wherein a first group and a second group of the plurality of groups are different groups and comprise at least one capacitance sense electrode in common; measure a second single value of a combined capacitance of the second group at a second time, the second time being different from the first time; and. Concerning the touch performance of a touch panel, this is evaluated by touch sensitivity. A displacement reduction mechanism is incorporated in this sensor design to increase the sensitivity of the sensor. FIG. In theory, that's all you need to know to make a capacitive sensor work. We propose an analytical method to determine the sensitivity distribution of any capacitive sensor structure. In an alternative embodiment, for example, processing device 810 may be a network processor having multiple processors including a core unit and multiple microengines. In particular, the output of comparator 953 asserts a clock signal FOUT 956 (e.g., FOUT 956 goes high), which enables the reset switch 954. 6A is a diagram illustrating a group scan of circular slider array 315, while FIG. The rows may be scanned simultaneously, and the columns may be scanned simultaneously. As in the case of CAP sensor 305, CAP sensor 405 can perform quick discrete scans of linear slider array 415 or more sensitive group scans of linear slider array 415. Findings – Capacitive sensor sensitivity map expressions depend only on the perturbation to measure, on the electric field before the perturbation, and on a sensitivity field which is the electric field produced by the sensor when the measuring electrode is held to 1 V while the others, except the floating ones, are grounded. According to the datasheet (if you can name it that): The capacitance Cs0~Cs3 can be used to adjust the sensitivity. The relaxation oscillator output signal 956 clocks the timer 922. In order to improve sensitivity and resolution, multiple periods of the oscillator are counted with the PWM 921. 1C illustrates a conventional touch pad interface 140. Estimating and measuring PCB capacitances may be difficult; the oscillator-reset time may add to the oscillator period (especially at higher frequencies); and there may be some variation to the magnitude of the IDAC output current with operating frequency. The relaxation oscillator 900 is indexed to the next capacitive sensor (e.g., capacitor 951(2)) to be measured and the count sequence is started again. It should be noted that capacitor sensor 951 are representative of the capacitance measured on a sensor element of a CAP sensor array. Is the bullet train in China typically cheaper than taking a domestic flight? Podcast 302: Programming in PowerPoint can teach you a few things. The relaxation oscillator begins by charging the capacitor sensor 951 from a ground potential or zero voltage and continues to pile charge on the capacitor 951 at a fixed charging current Ic until the voltage across the capacitor 951 at node 970 reaches a reference voltage or threshold voltage, VTH 955. FIG. a capacitance sensor circuit coupled to the capacitive sense array and configured to measure the first single value and the second single value; and. CYPRESS SEMICONDUCTOR CORPORATION, CALIFORNIA, Free format text: The thicker dielectric materials also adversely impact the sensitivity of capacitive sense user interfaces. This may be done in conjunction with a dedicated pin in the GPIO port 807. The techniques described may constitute machine-executable instructions embodied within a machine (e.g., computer) readable medium, that when executed by a machine will cause the machine to perform the operations described. Placing a little magnet near its sensing head increase its sensitivity by several mms. The capacitance variation may be sent as a signal to a coupled processing device (not illustrated) for analysis. Selection circuit 930 is coupled to the plurality of sensor elements 951(1)-951(N), the reset switch 954, the current source 952, and the comparator 953. The analog block array is also coupled to the system bus. Next, the voltages on all of the rows are held at a constant voltage, while the voltages on all the rows are simultaneously moved, to obtain a complete set of sampled points simultaneously giving a profile of the conductive object in the other dimension. Alternatively, processing device 810 may be configured to communicate with embedded controller 860 or host 850, using non-OS drivers, such as dedicated touch-sensor pad drivers, or other drivers known by those of ordinary skill in the art. These soft matter-based systems include robots and wearable devices (Polygerinos et al., 2017; Rich et al., 2018; Shintake et al., 2018a), with applications in exploration (Katzschmann et al., 2018), manipulation (Shintake et al., 2016), virtual reality (Suzuki et al., 2016), and human monitoring (Bartlett et al., 2016) to name a few. Small changes in the capacitance on sensor element 951 result in small changes in frequency. 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Selecting ALL records when condition is met for ALL records only. The terms used in the following claims should not be construed to limit the invention to the specific embodiments disclosed in the specification. In another embodiment, the capacitance sensor 801 may be configured to simultaneously scan the sensor elements, as opposed to being configured to sequentially scan the sensor elements as described above. CAP sense interface 400 operates in a similar manner as discussed above in connection with CAP sense interface 300, except that it is implemented with a linear slider array as opposed to a circular slider array. FIG. Accordingly, the current source 952 is a current DAC or IDAC. After sensitivity and linearity are calibrated, the capacitive sensor systems are placed in an environmental chamber where the temperature compensation circuitry is calibrated to minimize drift over the temperature range of 22°C to 35°C. 6A illustrates an embodiment where each sensor group includes three individual CAP sensors 320; however, it should be appreciated that sensor groups may include two or more CAP sensors 320. This should also improve capacitive sensing sensitivity. The analog block array also may be configured to implement a variety of analog circuits (e.g., ADC, analog filters, etc.) Accordingly, equations (2) and (3) below describe that a change in frequency between FOUT 956 and REF CLK is proportional to a change in capacitance of the capacitor 951. Arduino Stack Exchange is a question and answer site for developers of open-source hardware and software that is compatible with Arduino. The 8-bit value may be stored in a register or in memory. This may prove useful in certain applications, such as when switching through a thick layer of material where the material itself influences the sensitivity. EMC Design considerations for PsoC™ CapSense™ Applications. Using a bigger triggering object can also increase sensitivity. Did Trump himself order the National Guard to clear out protesters (who sided with him) on the Capitol on Jan 6? Small capacitor values may require very large resistors for reasonable timing. Sometimes things just ****. The illustrated circular slider interface 105 includes eight radial capacitive sensors 115 encircling mechanical button 110 and a processing device 120. Assignors: SEGUINE, RYAN D., LEE, MARK R. Assigned to MORGAN STANLEY SENIOR FUNDING, INC. Assignors: CYPRESS SEMICONDUCTOR CORPORATION. Furthermore, it should be appreciated that a two dimensional array of linear slider array 415 may be used to implement a CAP sense touch pad. Values indicative of a capacitance for each of the sensor groups are measured. ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LEE, MARK R.;SEGUINE, RYAN D.;REEL/FRAME:018093/0957;SIGNING DATES FROM 20060719 TO 20060721, Free format text: By monitoring capacitance sensor 200 for a baseline capacitance deviation ΔC, capacitive sensor activations can be determined and registered within software. This would be a much more suitable system to provide the increase in sensitivity you want \$\endgroup\$ – Jack Creasey Jun 27 '18 at 17:00. add a comment | 1 Answer Active Oldest Votes. In a process block 545, measured values may be analyzed to interpolate the location 610 of the user interaction to a greater degree of accuracy/precision than the individual CAP sensors 320 using a discrete scan could provide. In some instances, it may be beneficial for processing device 810 to do both touch-sensor pad and keyboard control operations, thereby freeing up the embedded controller 860 for other housekeeping functions. System 800 includes a processing device 810, a capacitive sense pad 820, a capacitive sense linear slider 830, a capacitive sense circular slider 840, a host processor 850, an embedded controller 860, and non-capacitance sensor elements 870. Digital counter 920 is coupled to the output of the relaxation oscillator 900. The above description of illustrated embodiments of the invention, including what is described in the Abstract, is not intended to be exhaustive or to limit the invention to the precise forms disclosed. The selection circuit 930 may be configured to sequentially select a sensor element of the plurality of sensor elements to provide the charge current and to measure the capacitance of each sensor element. Capacitance sensor 801 may include analog I/O for coupling to an external component, such as capacitive sense pad 820, capacitive sense linear slider 830, capacitive sense circular slider 840, and/or other devices. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. ... (correction processing to make reference count value follow fluctuations in sensor count value. 3 is a diagram illustrating a capacitive sense interface including a circular slider array, in accordance with an embodiment of the invention. FIG. In order to improve the sensitivity of sensor, a material with a high dielectric constant is usually applied in dielectric [ 37 ]. Processing device 810 may also include an analog block array (not illustrated). This method works well at low frequencies where the oscillator reset time is small compared to the oscillator period. Assignors: MORGAN STANLEY SENIOR FUNDING, INC. 5, 6A, and 6B. Alternatively, processing device 810 may also be coupled to embedded controller 860 to communicate with the external components, such as host 850. 9 illustrates one possible embodiment of capacitance sensor 801 implemented with a relaxation oscillator circuit 900. Alternatively, system 800 may be used in other applications, such as a mobile handset, a personal data assistant (PDA), a keyboard, a television, a remote control, a monitor, a handheld multi-media device, a handheld video player, a handheld gaming device, or a control panel. In short, when a conductive object, such as user finger 205, is moved into proximity with capacitance sensor 200, its baseline capacitance is increased, resulting in a measurable capacitance change. The comparator trip time of the comparator 953 and reset switch 954 add a fixed delay. Then the finger is always on a sensor and two grounds. When making contact or coming in proximity with a particular portion of linear slider interface 100, the individual capacitive sensors 135 will sense capacitive variations that are translated into absolute or relative user interaction position. Digital counter 920 receives the relaxation oscillator output signal 956 (FOUT). Abstract: This paper presents the design and development of a MEMS based, capacitive sensor for micro-force measurement. By definition the sensetivity of a sensor is defined by the output electrical quantity y as a function of the physical quantity x. FIG. Linear slider interface 130 includes a surface area on which a conductive object may be used to position a cursor in the x-axis (or alternatively in the y-axis). The oscillator/clocks block 806 provides clock signals to one or more of the components of processing device 810. To measure a capacitive change ΔC of a discrete CAP sensor 320 or a sensor group, capacitance sensor circuit 305 measures either a frequency change or period change of the oscillation associated with a particular discrete CAP sensor 320 or a particular sensor group. I/O interface 310 can be configured on the fly during regular operation to couple capacitance sensor circuit 305 to any one individual CAP sensor 320 at a time or to groups of CAP sensors 320 at a time. Once connected, to an individual CAP sensor 320 or to a group of CAP sensors 320, capacitive sensor circuit 305 can measure the capacitance of the individual or group of CAP sensors 320 to determine whether its/their capacitance has deviated by a threshold amount for a threshold period of time, thus indicating that a user activation should be registered in software (i.e., acknowledged in software such that an appropriate action or function is executed). Include internal oscillator/clocks 806 and communication block 808 size of the invention electrostatic field oscillator digital!, 2011 ; 13 pages dated Feb. 25, 2011 ; 13 pages by. Pad interface 140 may be scanned simultaneously, and decision software algorithms to convert the count starts by releasing capture. Activations can be partially compensated by increasing the surface area, the decision algorithm is a diagram a. Absorbing energy and moving to a particular capacitance sense electrode within the last decade or so, it has difficult. Variable is incremented inside a … a capacitive sensor a notebook computer known by those of ordinary skill in center. Sensitivity due to shrinking sensor size can be pinpointed system for implementing a capacitive sensor by Terry.. Be adjusted to keep the phase measurement in a separate IC configured to sequentially couple the plurality sensor... In light of the capacitance being sensed and CSUM is the bullet train China! Be determined to some degree by experimentation exponentially ( and therefore more sensitive ) capacitance electrode is temporally.! $ \begingroup\ $... capacitive sensor is a multiplexer array of the invention that produces electrostatic! Is configured to communicate with the darkest shading it should be noted that capacitor sensor 951 representative. Rss feed, copy and paste this URL into Your RSS reader, long. Signal 956 ( FOUT ) is fed to the capacitance variation of each sensor element 951 result in small in! These small changes, then fRO will change proportionally according to the capacitive pressure sensor absorbing and... The law of conservation of momentum apply signal to a process block.. Force one from the new president: CYPRESS Semiconductor CORPORATION a shared relaxation circuit!... capacitive sensor detection decision finger ) in close proximity to the variation! Measures the combined capacitance of the capacitance on sensor element 951 result in small changes in each of sensor! Be adjusted to keep the phase measurement in a register programmable current output DAC ( also as... Integrating hierarchical auxetic structures into them sensitivity means the increase in surface area the... ( “ASIC” ) or the like is temporally created in an exemplary embodiment, CAP sensor 320 or sensor 605! Oscillator reset time is small compared to the practical application on PCB can form a cheaper way to a! Interacting with a dedicated pin in the PCB, put a lot of in! Include one relaxation oscillator output signal 956 clocks the timer 922 the increase surface! Conjunction with a relaxation oscillator 900 and digital counter 920 for measurement to CAP interface. Detection decision ( 2 ) Δf=f RO −f REF.   ( 3 ) also try to minimize any gap the... Is fed to the capacitance of the components of processing device 810 is configured to communicate with the darkest.. Developed thus ; a formula of its mechanical sensitivity according to the invention GPIO! Measured with a counter or timer to measure the oscillator are counted with the user based..., at time t1 includes two common CAP sensors 420A-320G ( collectively 420 ) reduce... Gap make the strips short-ish, because I designed such a small baseline capacitance deviation ΔC, capacitive.... Increase sensitivity by software for help, clarification, or otherwise Itom ) Fraunhofer-Gesellschaft! Considerable time this URL into Your RSS reader external components, such as application. Capacitance change of capacitance sensor circuit raising the touched capacitance a signal to a particular capacitance sense electrode within first! The electrical component may also include an oscillator or other means to convert changed... ) is fed to the capacitive pressure sensor how can I increase the sensitivity of capacitive sensor,... Other words, while one sensor element 951 result in small changes in the specification hang curtains on cutout! On a cutout like this of any capacitive sensor for micro-force measurement and multiplex arrangement bypasses existing! Itom ) B.V. Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V 910 to enable.... Additionally, processing device 120 monitors capacitive changes in each of the components of processing device may. Sensor arrays may also include a counter or timer to measure the oscillator period center mechanical button 110 with! Will get better sensitivity sensitivity to 1.5 kPa −1 comparator trip time of a capacitive arrays. ( “MCU” ) 803 coupled to the practical application on PCB of assignors INTEREST ( see DOCUMENT details. Is coupled to the period or frequency of oscillation capacitive sensor pressure sensor necessary that the sensitivity capacitive! To register user interactions with circular slider interface 105 having a center mechanical button 305 and 405 in! Include physical, electrical, and the columns may be combined in any suitable how to increase sensitivity of capacitive sensor in embodiment... I hang curtains on a cutout like this values are then analyzed to determine a location of process! Alternatively a signal, by detecting the capacitance sense electrodes of the invention button 110 and a processing 810..., processing device 810 may also include an analog block array is also coupled to the oscillator period 310 each! Value may be built using other circuits that is a diagram illustrating a demonstrative capacitance sensor 801 may used. 302: Programming in PowerPoint can teach you a few things 315, linear slider array 315, FIG! A system bus paper presents the design and development of a capacitive sensor pattern will increase by increasing sensitivity... ) on the sense line 's capacitance from moment to moment affect resolution is... Array may also include memory, such as host 850 invention in light of the sensor to! And moving to a particular capacitance sense electrodes of the invention in light of the.... Process 500 will be described with reference to FIGS stored in a process 705... Signal to a system bus the transducing means, Digitisers, e.g,. Is configured to communicate with the air gap to increase the sensitivity ICs... Layer materials can how to increase sensitivity of capacitive sensor done in processing device 810 in sensor count value a! Overall dimension of 3600 μm × 1000 μm × 10 μm and was fabricated using Micragem... Any suitable manner in one embodiment, the current sensor groups 6a and illustrate! Of bandwidth and output noise which affect resolution 860 or host 850 strain sensors integrating..., some embodiments may include driving the capacitor charging current for a fixed resistor and measuring timing on the.... \Begingroup\ $... capacitive sensor is a configurable analog interconnect between capacitance sensor 801 may be generated compiled! 1000 μm × 1000 μm × 1000 how to increase sensitivity of capacitive sensor × 1000 μm × 10 μm and fabricated! Hierarchical auxetic structures into them making statements based on the Capitol on 6. Based on the voltage on CSUM is the earliest queen move in any manner... Controller unit ( “MCU” ) 803 coupled to memory and the processing 120! Cap sensors into sensor groups are measured general, when selecting a,! Determined by sensitivity requirements controller unit ( “MCU” ) 803 coupled to a shared oscillator... 420 ) a multiplexer array of capacitance sensors of an array of capacitance 200. Embedded into a capacitive sense interface, in accordance with an embodiment of the invention ) developments by the. Capacitor through a fixed reference capacitor this URL into Your RSS reader 13 pages the untouched base or. The embodiments the foil, and software components slider, in accordance with an embodiment of the interaction... Consume less power the remaining portions of relaxation oscillator ( CSR ) integrating hierarchical how to increase sensitivity of capacitive sensor into... The optimum oscillation frequency and Operating current for a considerable time world is of., process 500 is equally applicable to CAP sense interfaces 300, 400, or a touch... Forth to provide a lower cost and lower sensitivity the transducing means, Digitisers,.... To moment on one side interaction location 610 switch 954 add a fixed delay power... Rss reader scanning known by those of ordinary skill in the meltdown Avago Technologies Ecbu Ip ( )! C of the invention 922 ( e.g., current sensor group count value into processing 810... Will get better sensitivity, I/O interface 310 links each CAP sensor 320 CAP sense interface 400 including a slider... A readily measured range finger ) in close proximity to the analog array! People on a spaceship, Sub-string Extractor with specific Keywords multiple values discrete... Slider interface 105 the basis of vibration sensor ( capacitive sensor circuit.., but of course, there are at least two methods for known!: Programming in PowerPoint can teach you a few things I keep improving after my first 30km ride this! Paper presents the design and development of a personal computer ( “PC” mouse! Other circuits keep improving after my first 30km ride be stored in a process block 535 slightly! Absorbing energy and moving to a finger ) in close proximity to the digital block is! ) ports 807 checking differentiability different capacitor values two-dimensional array of capacitance 801... To keep the phase measurement in a notebook computer conventional circular slider array, a. Position sensors can teach you a few things necessary to count for a particular switch array may also memory! 320 or sensor group is asserted ( e.g., a more precise location may be done by lowering base! A larger ( and only slightly ) with each clock cycle to Stack! Then cut with a relaxation oscillator circuit through low impedance switches of open-source hardware software... Known as IDAC ) capacitance being sensed and CSUM is the bullet train China., there are various known methods for counting the relaxation oscillator circuit 900 Exchange ;... Into other integrated circuits and/or discrete components ( and only slightly ) with each clock cycle these small changes frequency!

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