ESP32-C3-MINI-1 Pinout

Overview

This guide covers the ESP32-C3-MINI-1 module: a small, shielded module with the flash memory embedded inside the chip package itself rather than on a separate external chip. It’s the module most ESP32-C3 “Super Mini”-style development boards are built around, but the pin functions below apply to the module itself, independent of any specific board.

No 802.15.4 radio on this chip, so Thread and Zigbee aren’t possible here: that needs an ESP32-C6 or H2 instead. (Only badges for protocols this exact chip actually supports are shown, no Wi-Fi 6/7 either: this is 802.11 b/g/n.)

Getting started

Most people using this module have it on a “Super Mini”-style development board, not the bare module by itself, and the three steps below assume that. If you’re wiring the bare module directly, see “Flashing pins” further down for how to connect a USB-to-serial adapter instead.

Hello World: blink an LED

The microcontroller equivalent of “Hello World”: GPIO10 toggles once a second, shown here in two different environments. Wire an LED (with a resistor) to GPIO10, a plain general-purpose pin with no other job on this module.

#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"

#define LED_PIN GPIO_NUM_10

void app_main(void)
{
    gpio_reset_pin(LED_PIN);
    gpio_set_direction(LED_PIN, GPIO_MODE_OUTPUT);

    while (1) {
        gpio_set_level(LED_PIN, 1);
        vTaskDelay(pdMS_TO_TICKS(1000));
        gpio_set_level(LED_PIN, 0);
        vTaskDelay(pdMS_TO_TICKS(1000));
    }
}

#define LED_PIN 10

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

void loop() {
  digitalWrite(LED_PIN, HIGH);
  delay(1000);
  digitalWrite(LED_PIN, LOW);
  delay(1000);
}

ESP-IDF: build and flash with idf.py build flash monitor. Arduino IDE: install ESP32 board support first, see “Getting started” above. Many of these boards also carry an onboard addressable RGB LED on GPIO8, that one needs a WS2812/NeoPixel library instead of a plain digitalWrite.

Specifications

Official Espressif specifications for the ESP32-C3 chip and the ESP32-C3-MINI-1 module.

Pinout diagram

The 30-pin layout used on most ESP32-C3 “Super Mini”-style development boards. The bare module itself exposes fewer pins, boards add extra breakout pins (like the second 5V/GND pair) beyond that.

GPIO quick reference

This chip only has ADC1 and ADC2, no DAC or capacitive touch peripheral, unlike the classic ESP32.

Flashing pins (UART0)

Used by a USB-to-serial adapter (or the onboard one) to upload firmware.

Safety notes