Supported Boards
Currently TouchLib supports the following boards:
| Board | Processor | Capacitive sensing method | Resistive sensing method | Max number of sensors | Notes |
|---|---|---|---|---|---|
| Arduino UNO | ATmega328P | CVD method | analogRead() method | 6 | [1,2] |
| Arduino Mega | ATmega2560 | CVD method | analogRead() method | 32 | [2] |
| Arduino Lilypad USB | ATmega32u4 | CVD method | analogRead() method | 6 | [1,2] |
| Teensy 3.2 | MK20DX256 | touchRead() method | analogRead() method | 32 | [3] |
| Particle Photon | STM32F205 | CVD method | analogRead() method | 16 | [4] |
| ESP32Dev Board | ESP32 | touchRead() method | analogRead() method | 32 |
If a board is not listed but uses the same processor as one of the boards listed above, there is a good chance that it will work as well. If it does not work, please let me know.
Notes:
[1] TouchLib is large and the Atmel ATmega328 / ATmega32u4 processors only have limited RAM and flash; TouchLib is therefore limited to only 6 sensors maximum and consumes up to 77% of RAM and 86% of flash.
[2] ATmega328, ATmega32u4 and ATmega1280 / ATmega2560 are slow processors and therefore update rate and noise performance are not as good as with some other processors.
[3] TouchLib is developed and tested on a Teensy 3.2 but should also work on Teensy LC, Teensy 3.0, 3.1 and 3.6. Note that the Teensy 3.5 doesn’t have the hardware peripheral to do capacitive sensing and is thus not supported at this moment.
[4] TouchLib is developed and tested on a Particle Photon but should also work on any Particle board that uses the STM32F205 (such as the Electron). Note that the 1st generation Particle boards (Spark Core) and the 3rd generation boards (Argon, Boron and Xenon) are using a different processor (STM32F103 respectively Nordic nRF52840) and are not supported at this moment.
Untested boards
Boards that are untested but might work:
- Any Arduino compatible board based on an ATmega328 processor.
- Any Arduino compatible board based on an ATmega1280 or ATmega2560 processor.
- Any Teensy compatible board based on MKL26Z64 (Teensy LC), MK20DX128 (Teensy 3.0), MK20DX256 (Teensy 3.1 / 3.2), or MK66FX1M0 (Teensy 3.6). Note that MK64FX512 (Teensy 3.5) is not supported currently since it lacks the touchRead() function.
- Any Particle compatible board based on an STM32F2xx processor.
- Any Arduino compatible board based on an ESP32 processor.
When using an untested board, please check that the pin mappings from GPIO port / pin to Arduino pin number and from ADC input to Arduino analog pin number (pin numbers that are prefixed with A) are the same as in the original supported board.
Unsupported boards
TouchLib does not work on ATtiny processors as these processors simply have way to little RAM and flash for TouchLib.