I have the new BrewPi Spark v2 Controller https://store.brewpi.com/featured/brewpi-spark-v2 and I am trying to get it to control the Sainsmart 2 channel relay. I notice that the digital output is only @4.8v not 5v ... could this cause the relay to not "click"?
On the 4 PIN [GND, IN1, IN2...