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Built-in project · ESP32-C3 SuperMini

SuperMini blink

The blue LED on GPIO 8 lights when the pin is low and an LED on GPIO 2 when it is high, on the smallest ESP32-C3 board. The whole build, an ESP32-C3 SuperMini 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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SuperMini blink · ESP32-C3 SuperMinilive0.000 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-C3 SuperMini
// Blink, with an LED that is the other way round.
//
// The SuperMini's blue LED is on GPIO 8, so LED_BUILTIN is 8, the same number
// as on the DevKitM-1. The difference is the wiring: here the LED runs from
// 3V3 through a resistor to the pin, so the pin has to go LOW to light it.
// An LED you wire yourself from GPIO 2 to GND is the ordinary way round, so
// the two are always opposite.

const int WIRED = 2;

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(WIRED, OUTPUT);
}

void loop() {
  digitalWrite(LED_BUILTIN, LOW);  // the blue LED on
  digitalWrite(WIRED, HIGH);       // the wired LED on
  delay(500);
  digitalWrite(LED_BUILTIN, HIGH);
  digitalWrite(WIRED, LOW);
  delay(500);
}

Parts list

4 parts, plus the jumper wires. Every one is in the editor's parts bin.

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-C3 SuperMini pin GND; LED, red pin C
  • ESP32-C3 SuperMini pin 2; Resistor, 220 Ω pin 1
  • Resistor, 220 Ω pin 2; LED, red pin A

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