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Built-in project · Raspberry Pi Pico

CircuitPython blink on a Pico

CircuitPython on a Raspberry Pi Pico: digitalio blinks the board’s own LED and a red LED on GP15, once a second, and print() says on and off. The whole build, a Raspberry Pi Pico and 2 more parts, runs here in your browser on the firmware below; open it in the editor to change the wiring or the code and run it again.

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The parts retail for about $4.15. On Mokxi they're free.

CircuitPython blink on a Pico · Raspberry Pi Picolive0.000 s 0.00x
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The circuit itself, running here on the simulator. Press what can be pressed; click anything else to open it in the editor.

The code

The MicroPython code exactly as the editor opens it. Change a line there and press Run: the board runs it on the official MicroPython firmware, with nothing to compile.

code.py · Raspberry Pi Pico
# CircuitPython on a Raspberry Pi Pico: blink an LED.
# board.LED is the Pico's own LED (GP25); the red LED on GP15 through
# 220 ohms blinks with it.
import board
import digitalio
import time

onboard = digitalio.DigitalInOut(board.LED)
onboard.direction = digitalio.Direction.OUTPUT
led = digitalio.DigitalInOut(board.GP15)
led.direction = digitalio.Direction.OUTPUT

while True:
    onboard.value = led.value = True
    print("on")
    time.sleep(0.5)
    onboard.value = led.value = False
    print("off")
    time.sleep(0.5)

Parts list

3 parts, plus the jumper wires. They retail for about $4.15; on Mokxi they're free.

How it is wired

3 connections, pin by pin, read from the circuit itself. Each line is one set of pins joined together, by a jumper wire or a breadboard strip.

  • Ground: Raspberry Pi Pico pin GND; LED, red pin C
  • Raspberry Pi Pico pin GP15; Resistor, 220 Ω pin 1
  • Resistor, 220 Ω pin 2; LED, red pin A

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Open it in the editor, change the circuit or the code, and keep your version in a free account.

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