IFD:Analog Circuits and Interfaces/interface schematics: Difference between revisions
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This circuit can be used to detect finger pressure or any force on a surface with the help of a pressure sensitive sheet material called 'velotstat'. You can find a tutorial how to build the physical sensor [https://learn.bela.io/tutorials/pure-data/sensors/diy-pressure-sensor/ here]. | This circuit can be used to detect finger pressure or any force on a surface with the help of a pressure sensitive sheet material called 'velotstat'. You can find a tutorial how to build the physical sensor [https://learn.bela.io/tutorials/pure-data/sensors/diy-pressure-sensor/ here]. | ||
The same circuit can be used with a different type of physical interfaces as well. Instead of the velostat material as a variable resistor we can use a layout of wires known as a 'moisture sensor'. | The same circuit can be used with a different type of physical interfaces as well. Instead of the velostat material as a variable resistor we can use a layout of wires known as a 'moisture sensor'. | ||
We can hookup our moisture sensor to the circuit above instead of the velostat sandwiched between two electrodes. | We can hookup our moisture sensor to the circuit above instead of the velostat sandwiched between two electrodes. | ||
[https://www.youtube.com/watch?v=DT6nZsixP0M Here] is a video showing how to build a moisture sensor. | [https://www.youtube.com/watch?v=DT6nZsixP0M Here] is a video showing how to build a moisture sensor. | ||
Revision as of 14:18, 19 January 2023
This page shows a few ways to sense touch or force and convert it to an analog voltages.
1V/Oct analog keyboard interface
This is a vintage style analog keyboard interface that is used e.g. on the stylophone to convert touches to pitches in 1V/Oct. More sophisticated version with note priority and touch/release detection can be found on music from outer space.
Velostat Pressure Sensor / Moisture-to-Voltage converter
This circuit can be used to detect finger pressure or any force on a surface with the help of a pressure sensitive sheet material called 'velotstat'. You can find a tutorial how to build the physical sensor here.
The same circuit can be used with a different type of physical interfaces as well. Instead of the velostat material as a variable resistor we can use a layout of wires known as a 'moisture sensor'. We can hookup our moisture sensor to the circuit above instead of the velostat sandwiched between two electrodes.
Here is a video showing how to build a moisture sensor.