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touch: add capacitive touch sensing on normal GPIO pins

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Tested on the following chips/boards:

  * RP2040 (Raspberry Pi Pico)
  * ATSAMD21 (Adafruit PyBadge)
  * NRF52840 (PCA10056 developer board)
  * ESP8266 (NodeMCU)
  * ATmega328p (Arduino Uno)
  * ESP32C3 (WaveShare ESP-C3-32S-Kit)
  * FE310 (SiFive HiFive1 rev B)

The sensitivity threshold in the example may need to be adjusted per
board though, the default value of 100 typically recognizes when a cable
is being touched but the RP2040 for example is capable of doing much
more precise measurements if the power supply is sufficiently
noise-free.
This commit is contained in:
Ayke van Laethem
2024-10-19 11:32:22 +02:00
committed by Ron Evans
parent 6d431e0726
commit 30f540c29f
3 changed files with 383 additions and 0 deletions
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smoketest.sh
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@@ -73,6 +73,7 @@ tinygo build -size short -o ./build/test.hex -target=microbit ./examples/st7789/
tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/thermistor/main.go
tinygo build -size short -o ./build/test.hex -target=circuitplay-bluefruit ./examples/tone
tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/tm1637/main.go
tinygo build -size short -o ./build/test.hex -target=pico ./examples/touch/capacitive
tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/touch/resistive/fourwire/main.go
tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/touch/resistive/pyportal_touchpaint/main.go
tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/vl53l1x/main.go