Push Button Using Raspberry Pi Pico

 

Control LED with Push Button Using Raspberry Pi Pico (MicroPython)

Objective

To control an LED using a push button on a Raspberry Pi Pico, written in MicroPython. This project is perfect for beginners learning input and output (I/O) control on microcontrollers.

 Components Required

S.N.ComponentQuantity
1Raspberry Pi Pico1
2LED (any color)1
3220Ω Resistor1(optional)
4Push Button1
5Breadboard + WiresAs needed
6Micro USB Cable1

 Circuit Description

  • LED's anode (long leg) is connected to GPIO 0 through a 220Ω resistor, and cathode to GND.

  • Push button is connected between GPIO 1 and 3.3V.

  • An internal pull-down resistor is enabled in code to keep the button input low when not pressed.

  • When the button is pressed, the input pin reads HIGH, and the LED turns ON.

       
ckt diagram






 Code: MicroPython for Button Controlled LED

python

from machine import Pin
from time import sleep

led = Pin(0, Pin.OUT)   
button = Pin(1, Pin.IN, Pin.PULL_DOWN)

print("Press button to turn ON the LED")

while True:
    if button.value() == 1:
        led.on()
    elif button.value() == 0:
        led.off()
    sleep(0.001)

 Working Principle

  • Pin(0, Pin.OUT) sets GPIO 0 as an output for the LED.

  • Pin(1, Pin.IN, Pin.PULL_DOWN) sets GPIO 1 as an input and activates the internal pull-down resistor.(you may used external resistor for pull up or down )

  • In the loop:

    • If the button is pressed (button.value() == 1), the LED turns ON.

    • If the button is not pressed (button.value() == 0), the LED turns OFF.

  • sleep(0.001) adds a tiny delay to avoid unnecessary CPU load.

Applications

  • Basic digital input handling.

  • Foundation for building user interfaces (like switches or sensors).

  • Can be expanded into memory games, door alarms, or counters.

 Advantages

  • Simple and very easy to understand.

  • Helps grasp core GPIO concepts (input/output).

  • Can be modified to include more buttons, LEDs, or logic.

 Limitations

  • No software debounce (LED may flicker if button bounces).

  • Only controls one LED with one button.

  • Doesn’t store LED state after button release.

 Suggestions

  • Add software debounce logic using delay or state tracking.

  • Use toggle logic to remember the state after button release.

  • Expand with multiple LEDs and buttons for more complex projects.

References

  • Raspberry Pi Pico GPIO documentation.

  • Youtube.

  • Concept explained and guided by ChatGPT.

 Conclusion

This simple LED control project using a push button and Raspberry Pi Pico is an excellent way to start learning real-world input/output programming. It lays the foundation for more advanced interaction-based microcontroller projects.

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