W1209 modification

Repository is work in progress

This repository contains my vision of modification of widely used W1209 thermostat. Here, I want to introduce following changes:

• add "universal" schematic to use with either:
  • 10-20K NTC (as original W1209)
  • DS18B20
  • TMP36 and alike
  • LMx35 and alike
• add a capacitor for RESET line of to prevent self-restart
  as reported here: 1

Remarks

• These thermostats were designed with STM8S103F3P6 microcontrollers, but there are variations with Nuvoton N76003AT20 MCU. The spare microcontroller can be salvaged from cheap STM8S103F3P6 devboards
  (examples 1, 2).

References

• The schematic of original module is "reviewed" here:
  1, 2, 3