ESP32 C3 Super Mini

Development Board

Code name: ESP32C3_DEV

ESP32C3 SUPERMINI

ESP32 C3 Super Mini is a development board based on the ESP32C3 microcontroller using RISCV32 architecture.

This board features a maximum CPU frequency of 160 MHz and 4MB flash memory.

About ESP32 C3 Super Mini

Have a red board?

Check ESP32 C3 Supermini Plus instead.

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 ESP32 C3 Super Mini

Starting from

3$ per unit

ESPBoards

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Technical Specifications

Complete technical specification details for ESP32 C3 Super Mini

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 & Pins

Digital IO 11

Analog Input 6

PWM 11

Interrupts 22

• 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

Download Full Datasheet

Quick Setup

Copy-paste configs for ESP32 C3 Super Mini - auto‑generated from this board's exact hardware specs.

ESP32C3 160 MHz 4MB QIO RISC-V

In Arduino IDE 2 select Esp32c3 Dev from the esp32 by Espressif package. In PlatformIO use board = esp32-c3-devkitm-1. ESP32C3 · 160 MHz · 4MB · QIO · RISC-V.

Tools menu settings

Board (select in Arduino IDE) Esp32c3 Dev

CPU Frequency 160 MHz

Flash Size 4MB

Flash Mode QIO

Upload Speed 921600

Architecture RISC-V

In Arduino IDE 2, open Boards Manager, search "esp32" by Espressif and install it. Then go to Tools → Board and select "Esp32c3 Dev" for the ESP32 C3 Super Mini.

platformio.ini


[env:esp32-c3-super-mini]
platform  = espressif32
board     = esp32-c3-devkitm-1
framework = arduino

; Exact hardware config for ESP32 C3 Super Mini
board_build.mcu        = esp32c3
board_build.f_cpu      = 160000000L
board_build.flash_size = 4MB
board_build.flash_mode = qio
board_upload.flash_size = 4MB

The board value is a close generic match - check PlatformIO board registry for an exact fit.

esp32: block (YAML)


esp32:
  board: esp32-c3-devkitm-1
  framework:
    type: arduino   # or "esp-idf"

# ESP32 C3 Super Mini - 160 MHz ESP32C3
# Flash: 4MB | USB: USB-C

Paste into your device's .yaml. See ESPHome ESP32 docs for full options.

esptool.py - flash command


esptool.py \
  --chip esp32c3 \
  --baud 921600 \
  write_flash \
    --flash_mode qio \
    --flash_size 4MB \
    0x0 bootloader.bin \
    0x8000    partitions.bin \
    0xe000    boot_app0.bin \
    0x10000   firmware.bin

Install: pip install esptool - replace firmware.bin with your binary - bootloader at 0x0

ESP32 C3 Super Mini Board Dimensions

Physical measurements for ESP32 C3 Super Mini

ESP32 C3 Super Mini dimensions - height, width

Width 18mm

Length 22.50mm

Pin Gap 2.54mm

3D Printed Cases

Professional enclosures for ESP32 C3 Super Mini

View on Etsy →

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.

Features:

Custom designs

Precise fit

Growing catalog

Multiple variants

View on Etsy Request Custom

ESP32 C3 Super Mini Pinout Diagram

Complete pin reference for ESP32 C3 Super Mini

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.

ESP32 C3 Super Mini pinout diagram (alternate view)

Safe Pins to Use

These pins are safe for general GPIO usage without boot or system conflicts

IO0

IO1

IO3

IO10

Why Are These Pins Safe?

✓ No boot sequence involvement

✓ No flash/PSRAM connections

✓ No USB or JTAG conflicts

✓ Freely assignable without issues

Pins to Avoid or Use with Caution

Reserved for critical functions. Misuse may cause boot failures, programming issues, or system conflicts.

Strapping Pins

Boot behavior & flash voltage

JTAG Debugging

Low-level debugging interface

USB Pins

USB Serial/JTAG communication

Flash/SPI Pins

Memory & PSRAM connections

UART Serial

Debugging & firmware uploads

PIN	Label	Why Avoid	Type
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 Additional Information

More details about ESP32 C3 Super Mini

ESP32-C3 SuperMini Expansion Board

🔌 Key Features

Lithium Battery Compatibility: Supports 3.7V lithium battery input for portable power solutions.
USB Charging with LED Indicator: Green LED lights up during charging and turns off when the battery is full.
Full IO Access: Breaks out all ESP32-C3 SuperMini GPIOs for easy connectivity to sensors and modules.
Compact Size: Measures only 37.4mm x 22.5mm x 15.2mm, ideal for compact projects.

⚙️ Advanced Power Configuration – Dual Voltage Outputs

The expansion board includes two independent power outputs: VCC1 and VCC2, both defaulting to 3.3V. You can reconfigure them to output 3.7V if needed.

How to Switch to 3.7V Output:

Remove the pre-installed 0Ω resistor for the desired rail (VCC1 or VCC2).
Short the three solder pads using tin to reroute the output to 3.7V.

This allows you to adapt the voltage to match your specific module or sensor requirements.

💡 Final Thoughts

This expansion board is a powerful upgrade for the ESP32-C3 SuperMini, bringing flexibility, better power control, and seamless sensor integration.

On-Board LEDs

LED indicators on ESP32 C3 Super Mini

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 →

Useful Links

Datasheets and resources for ESP32 C3 Super Mini

Board Datasheet

Technical specifications

ESP32C3 Datasheet

Microcontroller reference

GrabCab 3D Model

ESP32 C3 Super Mini Custom Pin Mapping

Pin configuration and GPIO mapping for ESP32 C3 Super Mini

Digital I/O Pins

Interrupt Pins

Analog Inputs

PWM Pins

Pin	Function	ESP Pin	I/O Type	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)

Legend

Function Pin role

GPIO ESP32 pin

I/O Direction

# Pin number

Pin Mappings

Complete pinout and GPIO mapping for ESP32 C3 Super Mini

Digital I/O Pins

Interrupt Pins

Analog Inputs

PWM Pins

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

Legend

A0 Analog input

T0 Touch sensor

PWM PWM capable

RX/TX Serial pins

LED Built-in LED

# Pin number

Default Tools & Configuration

Build and upload settings for ESP32 C3 Super Mini

Setting	Value
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 bytes)
Maximum data size	320 KB (327680 bytes)