/W1209_upgrade

Modification on the existing W1209 thermostat module

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