I consider using OpenSprinkler in my garden and would like to connect a soil moisture sensor.
I have choosen the soil moisture SMT50 by http://www.truebner.de which has an analog voltage output between
0-3V, see datasheet SMT50
Any advice on compatibility with OpenSprinkler is very appreciated.
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.