ESP32C3 based fan control board for a modular 3d printed radiator booster based on this design. The idea is to use ESPHome with Home Assistant to turn on up to 5 radiator booster fans, when my smart thermostats are turning on, and use a Home Assistant automation to keep them running for an hour and automatically shut them off after that.
For an interactive KiCad experience see: Radiator Booster.
