Tare via physical switch (ESP8266), experiment..

[ClausTonnesen]

I have added a physical switch to Tare the load cells when using the CG-Scale stand alone.
Simple, apart from the limited amount of GPIO pins on the ESP8266, actually close to none free when using 3 load cells.

Simple, hook up to D8 (GPIO15), but that doesn't work for input.. back to reading the manual :(
After reading a bit, I figured that the RX (GPIO3) could be used as input.
It breaks the USB/Serial functionality, but when up and running and everything available via the Web GUI, I can live with that.

I haven't tested GPIO9/10 as my wire was to short, and no jumper around (and running out of time for today).

Anyway.. got it running like this
In .h
// Enable pull up on Tare input pin
#ifdef PIN_TARE_BUTTON
pinMode(PIN_TARE_BUTTON, INPUT_PULLUP);
#endif

In setup
// use the RX pin for tare button input, BREAKS the USB/Serial interface, comment out for acces via USB!!
#define PIN_TARE_BUTTON RX

Thoughts