Reply To: Controlling 12-volt heaters with a power relay

@shicks I’m also going to be adding an air temperature sensor that has a 12-volt fan in the radiation shield. The fan can run at lower power by using pulse width modulation. I’m wondering if there might be a way to accomplish this with the power relay, since the fan will have to be connected directly to the battery like the heaters on my other sensors. Is that something that can be done using the Mayfly and the Seeed Studio power relay we’ve discussed here? PWM is new for me, so I’m not exactly sure how that would look trying to control the power consumption of a fan that is not drawing its power from the Mayfly.