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Built-in project · ESP32-DevKitC V4

DevKitC blink

An LED on GPIO 2 of Espressif’s ESP32-DevKitC V4, which has no user LED of its own and covers the breadboard’s whole width. The whole build, an ESP32-DevKitC V4 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 $15.15. On Mokxi they're free.

DevKitC blink · ESP32-DevKitC V4live0.000 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 firmware exactly as the editor opens it. Change a line there and press Run: it compiles in the browser.

sketch.ino · ESP32-DevKitC V4
// Blink, on a board with no LED of its own.
//
// The ESP32-DevKitC V4 has one lamp, the power LED, so there is no
// LED_BUILTIN here. Put an LED and a 220 ohm resistor from 2 to GND instead.
// The header is numbered by GPIO, so 2 is GPIO 2.

const int LED = 2;

void setup() {
  pinMode(LED, OUTPUT);
}

void loop() {
  digitalWrite(LED, HIGH);
  delay(500);
  digitalWrite(LED, LOW);
  delay(500);
}

Parts list

4 parts, plus the jumper wires. They retail for about $15.15; 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: ESP32-DevKitC V4 pin GND; LED, red pin C
  • ESP32-DevKitC V4 pin 2; Resistor, 220 Ω pin 1
  • Resistor, 220 Ω pin 2; LED, red pin A

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