OpenSprinkler Forums Hardware Questions Soil moisture sensor SMT50 Reply To: Soil moisture sensor SMT50



It’s tricky to use an analog sensor with OS 3.0 — the reason is that OS 3.0 uses ESP8266 which has only 1 analog pin and that’s already used for sensing solenoid current. If you want to interface with additional analog sensors you will have to get a ADC module (like PCF8591) and connect it to OS 3.0 through I2C.