How to control 5V fan speed using Raspberry Pi Pico PWM and MicroPython?

Question

I dont if this is the correct place to ask this. Please give me feedback any kind will do.

How can I control fan speed using PWM on Raspberry Pico ?

Lets say if I have 5V fan, and a Raspberry Pico. Any other component I should buy ? Please also tell schematic if it is possible because I'm still new in this type of electronic stuff. Also how to utilize MicroPython to achieve that?

Answer 1

First of all, the RPi Pico's GPIO pins output 3.3V, not 5V. You can, however, get a steady 5V from the VBUS output from the board, assuming you're powering it from a 5V source.

I myself learnt how to use the PWM stuff from here: https://microcontrollerslab.com/raspberry-pi-pico-pwm-micropython-tutorial/

Here's a code snippet from the website, which would make PWM work on Pin13 at a PWM frequency of 1000Hz. So, just connect a resistor from Pin13 to the +ve of the LED and a jumper wire from -ve on the LED to neutral.

from machine import Pin, PWM
from time import sleep

led = PWM(Pin(13))
led.freq(1000)


while True:
    for duty in range(0,65535):
        led.duty_u16(duty)
        sleep(0.0001)

Hope this helps :)