DIY Smart Thermostat
• Mark Eschbach
Residential thermostats in my area boil down to two effective subsystems:
- A set of relays to control which features of the HVAC system are on.
- Programs to monitor and activate those relays based on some predefined set of rules.
Perhaps I missed something however the price of thermostats, especially smart thermostats, seems absolutely silly. Really my desire is for a relatively unintelligent node controlling the relays and move the smarts into something like Home Assistant. Probably a bad idea, but I bet I can get below the $60 for an internet connected device.
Hilariously while researching parts I came across a Espressif Board containing a temperature and humidity sensor.
|ESP DevKitC (v4)||CPU/MCU||$7.595 ($15.19 for 2)|
|4 channel Songle SRD-05VDC-SL-C||HVAC signaling||$7.99|