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Interactive pinout

ESP32-C3 SuperMini pinout

The tiny 16-pin ESP32-C3 SuperMini, shown with the USB-C port at the top. Labels vary slightly between sellers — this follows the common layout.

  • GPIO
  • Power
  • Ground / N.C.
  • Reset
  • Has a warning

Selected pin

9GPIO9

Boot-critical — avoid

GPIOPWMI2C

Default I2C SCL. Connected to the BOOT button.

i2c
I2C0 SCL

Boot-critical: Strapping pin (GPIO9): LOW at reset enters download mode. Don't hold it low from external circuits.

Code for this pin

const int PIN = 9;

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

void loop() {
  digitalWrite(PIN, HIGH);
  delay(500);
  digitalWrite(PIN, LOW);
  delay(500);
}
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Good to know

  • ›GPIO18 and GPIO19 are the USB D−/D+ lines and are not broken out.
  • ›ADC1 (GPIO0–4) is the safe choice for analog reads; ADC2 (GPIO5) is unreliable with Wi-Fi.
  • ›Some batches have weak Wi-Fi range because of the antenna layout — keep the antenna end away from metal.
Full ESP32-C3 SuperMini specs ESP32 pins to avoid

Where to buy

Adafruit SparkFun Amazon AliExpress

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