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Built-in project · ESP32 DevKit V1

MicroPython blink on an ESP32

MicroPython on an ESP32 DevKit: machine.Pin blinks the board’s own LED on GPIO 2 and a red LED wired to D2, twice a second, and print() says on and off. The whole build, an ESP32 DevKit 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 $9.15. On Mokxi they're free.

MicroPython blink on an ESP32 · ESP32 DevKit V1live0.000 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.

main.py · ESP32 DevKit V1
# MicroPython on an ESP32 DevKit: blink an LED.
# GPIO 2 is the DevKit's own blue LED, and the red LED wired to D2 through
# 220 ohms blinks with it.
from machine import Pin
import time

led = Pin(2, Pin.OUT)

while True:
    led.value(1)
    print("on")
    time.sleep_ms(500)
    led.value(0)
    print("off")
    time.sleep_ms(500)

Parts list

3 parts, plus the jumper wires. They retail for about $9.15; 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.

  • ESP32 DevKit V1 pin D2; Resistor, 220 Ω pin 1
  • Resistor, 220 Ω pin 2; LED, red pin A
  • Ground: LED, red pin C

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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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