thanks for replying..With a relay, you can switch the pump to fully on or fully off. You cannot 'fine tune' the flow with a relay.
The 'governor' devices you mention seem to use a PWM control using an oscillator and a power (mosfet)-transistor.
You could look for an optoisolated mosfet switch like https://www.dfrobot.com/product-1567.html which allows PWM. Optoisolation helps to keep voltage spikes away from the RPi. Flywheel diode needed, guess not a bad idea. If pump uses a brushed DC motor, then add EMV filter.
A RPi can be used, but a raspberry pico could also do the job of producing PWM.
if that so..mosfet can be use like PWM control. so i can use python to control the pump speed. i trying to find python coding about this mosfet but no luck. can you give me how to control mosfet using python?
if i use mosfet, then i no need to use relay.right?
Statistics: Posted by myihan21 — Thu Jul 11, 2024 5:22 am