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.