Piezoresistive sensors and sensor arrays
Highly expressive and flexibly programmable foot-operated controllers are described. Specific implementations are intended for musical applications and allow musicians an unprecedented degree of control of a wide variety of musical components and subsystems for recording and/or performance.
1. An apparatus, comprising:
a dielectric substrate having two conductive traces on a surface thereof;
fabric characterized by a resistance that changes in response to time-varying pressure, wherein the fabric is positioned to contact the surface of the dielectric substrate and both of the conductive traces; and
circuitry configured to receive a signal from one of the conductive traces via a connection between the circuitry and the conductive trace, the circuitry also being configured to generate data based on the signal, the data representing the time-varying pressure.
2. The apparatus of claim 1 , wherein the fabric is positioned to contact the surface of the dielectric substrate and the conductive traces in response to the time-varying pressure.
3. The apparatus of claim 2 , further comprising a mechanical structure to which the fabric is secured, the mechanical structure is movable in response to the time-varying pressure.
4. The apparatus of claim 1 , wherein the signal monotonically represents the time-varying pressure.
5. The apparatus of claim 1 , wherein the signal represents a continuous range of the time-varying pressure.
6. The apparatus of claim 1 , wherein the circuitry is configured to adjust a sensitivity of the data to the signal.
7. The apparatus of claim 1 , wherein the circuitry is configured to generate control information from the signal, and to map the control information to a control destination representing operation of a process or device.
8. The apparatus of claim 1 , wherein the substrate is a printed circuit board.
9. The apparatus of claim 1 , further comprising a material overlying the fabric and the substrate, wherein the time-varying pressure is relative to a surface of the material.
10. The apparatus of claim 1 , wherein the signal is an analog voltage representing the time-varying pressure.
11. An apparatus, comprising:
a dielectric substrate having a plurality of conductive traces on a surface thereof;
a plurality of pieces of fabric, each piece of fabric being characterized by a resistance that changes in response to time-varying pressure, wherein each piece of fabric is positioned to contact the surface of the dielectric substrate and a corresponding pair of the conductive traces; and
circuitry configured to receive a signal from each of the pairs of the conductive traces via a corresponding connection between the circuitry and each of the pairs of the conductive traces, the circuitry also being configured to generate data based on the signals, the data representing the time-varying pressure.
12. The apparatus of claim 11 , further comprising a surface of the apparatus adjacent the pieces of fabric and the substrate, wherein the circuitry is configured to determine a location of an object relative to the surface of the apparatus based on the data.
13. The apparatus of claim 11 , further comprising a surface of the apparatus adjacent the pieces of fabric and the substrate, wherein the circuitry is configured to detect motion of an object relative to the surface of the apparatus based on the data.
14. The apparatus of claim 13 , wherein the data represent the motion of the object in one or more linear dimensions.
15. The apparatus of claim 14 , wherein the circuitry is configured to adjust a sensitivity of the data to the signals independently for each of the linear dimensions.
16. The apparatus of claim 13 , wherein the data represent the motion of the object in one or more rotational dimensions.
17. The apparatus of claim 16 , wherein the circuitry is configured to adjust a sensitivity of the data to the signals independently for each of the rotational dimensions.
18. The apparatus of claim 11 , wherein the circuitry is configured to selectively ignore one or more of the signals in generating the data.
19. The apparatus of claim 11 , wherein the circuitry is configured to selectively adjust a sensitivity of the data to one or more of the signals.
20. The apparatus of claim 11 , wherein each signal is an analog voltage representing the time-varying pressure for a corresponding one of the pieces of fabric.