More-or-Less Compatible W1209 Clones

A project log for W1209 Data Logging Thermostat

The W1209 thermostat is cheap, but it's about time that it learns new tricks!

ThomasThomas 02/09/2018 at 20:110 Comments

A GitHub user documented a W1209 clone with a common anode display. This issue describes how to spot such a clone, and it also contains code patched for using the CA display. This board will be supported in the near future.

I found one more clone with a different PCB layout, and I ordered one for examination.