Control DPS5015 fan with PWM, rather than on/off

[cortices]

Pin B11, which controls the fan on DPS5015, is channel 4 of timer 2. Theoretically, I believe we should be able to set up Timer 2 for PWM control of the fan, so the operating speed can be ramped according to output wattage (since there's no temperature sensor AFAIK).

[kanflo]

That would be very nice and ramping according to output wattage is a clever idea, lacking a temperature sensor.

[gnbl]

DPS5015 (and DPH5005) seem to have a temperature sensor, see https://github.com/kanflo/opendps/issues/50#issuecomment-443231110