ESP32 C3 Super Mini Development Board

Code name: ESP32C3_DEV

ESP32 C3 Super Mini development board is based on esp32c3 microcontroller and uses riscv32 architecture. This board has a maximum CPU frequency of 160 MHz and a flash size of 4MB.

⚡ Tech Specs 📌 Pinout 💡 On-Board LEDs 🔗 Useful Links 🗺️ Mappings 🛠️ Tools

About ESP32 C3 Super Mini

⚠️ If you have the red board, check ESP32 C3 Supermini Plus.

The ESP32-C3 SuperMini is a tiny yet powerful development board built around the Espressif ESP32-C3 chip. With WiFi 802.11b/g/n and Bluetooth 5 (LE), it’s perfect for IoT projects that need reliable wireless connectivity. 📶

Designed with a compact form factor, this board is easy to integrate into space-constrained projects. Its PCB antenna ensures stable wireless performance without needing an external antenna.

For ease of use, it includes a reset button 🔘 and a bootloader mode button, making development and debugging smooth. 🚀

With its versatile interfaces (UART, I2C, SPI) and plenty of GPIOs, the ESP32-C3 SuperMini is a great choice for your next embedded project! ⚙️

🆚 Wondering how the ESP32-S3 SuperMini compares to other SuperMini boards? Check out our full comparison guide to see how it stacks up against the C3, C3 Plus, C6, and H2.

Where to Buy

Starting from

5$ per unit

Amazon.com Ships worldwide

View Price

Amazon.de Ships to EU

View Price

AliExpress Best value

View Price

Prices are subject to change. We earn from qualifying purchases as an Amazon Associate.

Technical Specifications

🔌 USB

Type USB-C

Serial Chip Native

🛰️ Connectivity

WiFi 802.11 b/g/n (2.4 GHz)

Bluetooth 5.0

BLE 5.0

🧠 Microcontroller

Model esp32c3

Clock Speed 160 MHz

Flash Size 4MB

Architecture riscv32

✨ Features

Ultra-small size: As small as the thumb (22.52 x 18 mm)
Ultra-low power consumption: deep sleep power consumption of about 43μA
Onboard LED blue light: GPIO8 pin
11 digital IO pins
22 external interrupt pins
6 analog input pins
11 PWM pins

View Full Datasheet

ESP32 C3 Super Mini Dimensions

Width 18 mm

Length 22.50 mm

Pin Gap 2.54 mm

ESP32 C3 Super Mini Case / Enclosure

Looking for a case to finish up your project with ESP32 C3 Super Mini? Check our 🛒 Etsy Store

We offer a variety of enclosures for the ESP32 C3 Super Mini, available in different colors and configurations – with or without header pins, and more! You can also choose between a hexagon-patterned lid for improved heat dispersion ❄️ or a solid lid for a sleek finish.

On our 🛒 Etsy Store, you can find cases for different ESP32 development boards, the ESP32 boards with sensors, screens, etc. The stock is always filling up! 📦

Need a custom case? ✉️ Contact Us on Etsy Store or Contact Form

ESP32 C3 Super Mini Pinout

The ESP32-C3 Super Mini pinout is designed to provide maximum functionality in a most compact package. The ESP32-C3 Supermini features key power pins like 5V, 3.3V, and GND, ensuring stable power delivery for various peripherals and components.

The pinout includes dedicated communication pins, such as RX and TX for UART, SDA and SCL for I2C, and MISO, MOSI, SCK, and SS for SPI protocols. These allow seamless integration with a wide range of devices, from sensors to displays and external storage.

For analog input, the ESP32-C3 Super Mini offers ADC pins labeled A0 to A5, ideal for reading sensor data or measuring voltage levels. This flexibility makes the ESP32-C3 Supermini pinout suitable for both simple and complex projects.

Overall, the ESP32-C3 Super Mini provides a well-rounded pinout that supports digital I/O, analog input, and multiple communication protocols, despite being very small.

✅ Safe Pins to Use

For general GPIO usage, these are the safest and most flexible choices:

🔹 IO0

🔹 IO1

🔹 IO3

🔹 IO10

Why Are These Pins Safe?

Not involved in bootstrapping → No impact on device boot mode or system startup
Not linked to flash memory or PSRAM → Won't interfere with storage or memory access
Not dedicated to USB or JTAG → Free for general use without affecting debugging
No special hardware connections → Freely assignable without internal conflicts

⚠️ Pins to Avoid or Use with Caution

Some pins are reserved for critical functions like bootstrapping, JTAG debugging, USB communication, and flash memory operations. Misusing these pins may lead to boot failures, programming issues, USB conflicts, or disruptions in flash storage.

Critical Pin Categories:

🛠️ Strapping Pins: Control boot behavior and flash voltage selection
🔗 JTAG Debugging Pins: Required for low-level debugging
🔌 USB Communication Pins: Used for USB Serial/JTAG communication
⚡ Flash Memory & SPI Pins: Connected to SPI flash memory and PSRAM
📡 UART Serial Communication Pins: Used for debugging and firmware uploads

PIN	Label	Reason	Function
IO2	GPIO2	Must be held high during boot (if low on reset, normal flash boot may fail)	🛠️ Strapping
IO4	MTMS	Used during boot; JTAG TMS for debugging; acts as Quad-SPI flash IO (hold data line) in internal-flash variants	🔗 JTAG
IO5	MTDI	Used during boot; JTAG TDI for debugging; acts as Quad-SPI flash IO (write-protect data line) in internal-flash variants	🔗 JTAG
IO6	MTCK	Used during boot; JTAG TCK for debugging; provides flash clock in internal-flash variants	🔗 JTAG
IO7	MTDO	Used during boot; JTAG TDO for debugging; acts as Quad-SPI flash IO (data line) in internal-flash variants	🔗 JTAG
IO8	GPIO8	Must be held high during reset (if low, UART flashing/boot may not work)	🛠️ Strapping
IO9	GPIO9	Controls boot mode on reset (HIGH for normal flash boot, LOW enters serial download mode)	🛠️ Strapping
IO21	U0TXD	Used as UART0 transmit (console/bootloader); repurposing may disable serial console output and printing	📡 UART
IO20	U0RXD	Used as UART0 receive (console/bootloader); repurposing may disable serial programming and debug logs	📡 UART

ESP32 C3 Super Mini On-Board LEDs

The ESP32-C3 Supermini features two onboard LEDs with specific functions and GPIO assignments. Below is a breakdown of their roles and how to use the controllable one in both Arduino and ESPHome.

🔴 Red LED – Power Indicator

GPIO: None
Control: Not controllable via GPIO
Behavior: Always on when the board is powered

🔵 Blue LED – User Controllable

GPIO: GPIO8
Control: digitalWrite(), ESPHome GPIO output

Arduino Example:


void setup() {
  pinMode(8, OUTPUT);
}

void loop() {
  digitalWrite(8, HIGH);
  delay(1000);
  digitalWrite(8, LOW);
  delay(1000);
}

ESPHome Example:


output:
  - platform: gpio
    pin: 8
    id: blue_led

light:
  - platform: binary
    name: "Blue LED"
    output: blue_led

ESPHome GPIO Output Documentation →

ESP32 C3 Super Mini Useful Links

🔗 Datasheet

https://dl.artronshop.co.th/ESP32-C3%20SuperMini%20datasheet.pdf

🔗 ESP32C3 Datasheet

https://www.espressif.com/sites/default/files/documentation/esp32-c3_datasheet_en.pdf

🔗 GrabCab 3D Model

https://grabcad.com/library/esp32-c3-supermini-1

ESP32 C3 Super Mini Pin Mappings

This development board provides 11 digital IO pins, out of which 22 can be used as external interrupt pins , 6 as analog input pins and 11 pins have Pulse-Width Modulation (PWM) .

Pin	Function	ESP Pin	Input/Output	Description
1	5V	5V	POWER INPUT	5V power input for the board
2	GND	GND	POWER GROUNT	Ground connection
3	3V3	3.3V	POWER OUTPUT	3.3V power output
4	IO0	A0	BIDIRECTIONAL	GPIO, ADC pin, PWM
5	IO1	A1	BIDIRECTIONAL	GPIO, ADC pin, PWM
6	IO2	A2	BIDIRECTIONAL	GPIO, ADC pin, PWM
7	IO3	A3	BIDIRECTIONAL	GPIO, ADC pin, PWM
8	IO4	A4	BIDIRECTIONAL	GPIO, ADC pin, SCK, PWM
9	IO5	A5	BIDIRECTIONAL	GPIO, ADC pin, SPI Master In Slave Out, PWM
10	IO6	MISO	BIDIRECTIONAL	GPIO, SPI Master Out Slave In, PWM
11	IO7	SS	BIDIRECTIONAL	GPIO, SPI Slave Select, PWM
12	IO8	SDA	BIDIRECTIONAL	GPIO, I2C Data line, PWM
13	IO9	SCL	BIDIRECTIONAL	GPIO, I2C Clock line, PWM
14	IO10	RX	BIDIRECTIONAL	GPIO, PWM
15	IO21	TX	BIDIRECTIONAL	GPIO, UART Transmit
16	IO20	RX	BIDIRECTIONAL	GPIO, UART Receive (secondary)

Function Pin Function

ESP Pin Pin on ESP32

I/O Input/Output Pin

Description Pin Description

ESP32 C3 Super Mini Pins Mapping Arduino IDE

Below you can find the ESP32 C3 Super Mini pinout. This development board provides 11 digital IO pins, out of which 22 can be used as external interrupt pins, 6 as analog input pins and 11 pins have Pulse-Width Modulation (PWM).

Pin	Analog	Other
0	A0
1	A1
2	A2
3	A3
4	A4	SCK
5	A5	MISO
6		MOSI
7		SS
8		LED_BUILTIN SDA
9		SCL
20		RX
21		TX

Analog Analog input pins

Touch Touch pins

Function Function pins

RX / TX Receive/Transmit

LED_BUILTIN Built-in LED

PWM Pulse-Width Modulation

Default Tools

Bootloader tool	esptool_py
Uploader tool	esptool_py
Network uploader tool	esp_ota
Bootloader address	0x0
Flash mode	qio
Boot mode	qio
Maximum upload size	1280 Kb (1310720 B)
Maximum data size	320 Kb (327680 B)

The ESP32 C3 Super Mini development board by default uses esptool_py uploader tool, esp_ota network uploader tool for Over-the-air (OTA) uploads and esptool_py bootloader tool. The bootloader starts at address "0x0". Flash mode and boot mode for ESP32 C3 Super Mini development board by default is qio and qio respectively.