i have a spare mk42 heater bed and I would like to use it has a plant heated bed for sprouting.
I only have to reach a maximum of 35 °C.
I was thinking of using a MOSFET and the Arduino PID library, but I don't know if this would work with a small 12v power supply, like 2a or 5a ?
The mk42 is used on 3d printers (similar to MK2 heated bed) and is powered by 300w+ PS.
What if the PID library set the PWM output to 1024 (basically all open) ? would a 20 to 50w power supply fail since the resistance of the mk42 is about 0.9 ohm ? Or it would just work more slowly ?