Underfloor heating with PID controller, Node-RED
Updated 2024-11-14 ! In a former post I did some hacking/checking how our underfloor heating control system handled the valves, actuators, regulating the heat. Now it was time to do some tests with Node-RED(NR), with a PID controller , and a Shelly 1 (S1) connected via WiFi and driving the actuator. The actuators are in my case controlled by 24 VAC and the S1 accepts 110 - 240 VAC, 24 - 60 VDC and 12 VDC. So in this case it was simple to just add a rectifier and a capacitor, to the 24 VAC, to get approx 36 VDC to source the S1.