Hello and welcome back. In this tutorial, we will learn how to control LED brightness using the Raspberry Pi Pico board. For that, I used a potentiometer. Through this, we can get the analog values and use that value to control the potential given to the LED bulb. It’s simply called PWM. This process can be done without a potentiometer. But using a potentiometer we can increase or decrease the LED brightness values as we want. You can also learn how to get an analog read on a Raspberry Pi board. If you want to know how to control LED brightness using Arduino, click this link. I also used the Micropython language and the Thonny IDE for this project. If you don’t have any idea about this, please use this link.
What is PWM?
PWM is simply called Pulse Width Modulation. Through this, we can get any value between the maximum and minimum value of the potential used to operate a microcontroller. For example, through a microcontroller powered by 5v, we can get any potential from 0v to 5v. Also, through the Raspberry Pi Pico board, we can get a potential between 0v to 3.3v. If you want to know more info about PWM, Please use this link. The PWM value on the Arduino board is between 0-255 and on the Raspberry Pi Pico board, it’s between 0-65535. Also, we can use any GPIO pins on the Raspberry Pi Pico board for PWM.
What is Analog Input?
From this, we can get the potential values between 0v to 3.3v in the Raspberry Pi Pico board. Also, we can do this task simply with a potentiometer or a preset. For that, we can use the GPIO 26,27,28, and 29 pins in the Raspberry Pi board. Also, we can get these analog values between 0 to 65535.
OK, let’s do this project step by step. The required components are given below.
- Raspberry Pi Pico board x 1 — Amazon / Our Store
- Potentiometer x 1 — Amazon / Our Store
- 180-ohm resistor x 1 — Amazon / Our Store
- LED bulb x 1 — Amazon / Our Store
- Breadboard x 1 — Amazon / Our Store
- Jumper wires — Amazon / Our Store
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Firstly, identify these components.
Secondly, attach the Raspberry Pi Pico board, potentiometer, LED, and 180-ohm resistor to the breadboard.
Thirdly, connect these components to the Raspberry Pi Pico board. For that use the circuit diagram below.
Next, connect it to the computer. Now, let’s create the program for this project. It’s as follows.
- Full details of this project – Download
#Include the library files from machine import ADC, Pin,PWM from time import sleep led = PWM(Pin(2))#Include the LED pin potentiometer = ADC(28)#Include the potentiometer pin led.freq(1000)#Set the frequency while True: value = potentiometer.read_u16()#Get the values print(value)#Print value on the shell led.duty_u16(value)#Turn the LED ON and OFF sleep(0.2)#Set the delay time
We can use the PWM class for PWM and the ADC class for analog input.
Now, save this code on the Raspberry Pi Pico board as “main.py“.
Finally, run this code and enjoy this project.