ESP32 C3 Super Mini Plus Development Board

Code name: ESP32C3_DEV

ESP32 C3 Super Mini Plus 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 Plus

⚠️ If you have the black pcb board, check ESP32 C3 Supermini

The ESP32-C3 SuperMini Plus is an enhanced IoT mini development board based on the Espressif ESP32-C3 WiFi/Bluetooth dual-mode chip. It shares the same core architecture as the standard SuperMini, featuring a 32-bit RISC-V CPU, 400 KB of SRAM, and 4 MB of flash memory. The board supports IEEE 802.11b/g/n WiFi and Bluetooth 5 (LE) protocols, ensuring robust connectivity.

A key difference between the two models is the antenna design. The SuperMini features a built-in small PCB antenna, whereas the SuperMini Plus comes with an external antenna that connects to the board via a U.FL connector, offering better range and signal strength for wireless applications.

The SuperMini Plus also comes in a distinct red PCB variant and features an onboard RGB LED, allowing for more flexible LED control compared to the single blue LED on the original SuperMini. This RGB LED enables users to program different colors for status indications, making it more versatile for IoT and embedded projects.

🆚 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

AliExpress Best value

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Technical Specifications

🛰️ 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

Red PCB variant
Ultra-low power consumption: deep sleep power consumption of about 43μA
Onboard RGB LED for multi-color status indication
11 digital IO pins
22 external interrupt pins
6 analog input pins
11 PWM pins

View Full Datasheet

ESP32 C3 Super Mini Plus Case / Enclosure

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

We offer a variety of enclosures for the ESP32 C3 Super Mini Plus, 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 Plus Pinout

The ESP32-C3 Super Mini Plus pinout is the same as ESP32 C3 Super Mini.

The ESP32-C3 Super Mini Plus pinout retains the compact yet versatile layout of its predecessor. Key power pins such as 5V, 3.3V, and GND ensure stable power delivery for various peripherals. The board supports communication protocols with dedicated RX and TX for UART, SDA and SCL for I2C, and MISO, MOSI, SCK, and SS for SPI interfaces.

The ESP32-C3 SuperMini Plus expands its capabilities with an onboard RGB LED, replacing the single blue LED of the original SuperMini, allowing users to control various colors programmatically.

Additionally, the board retains 11 digital GPIOs (PWM-capable) and 4 analog I/Os (ADC-capable), making it ideal for diverse IoT applications.

✅ 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 Plus On-Board LEDs

The ESP32-C3 Supermini Plus features three onboard LEDs: a power indicator, a user-controllable blue LED, and a WS2812 RGB LED. Note that the Blue LED and WS2812 share GPIO8, which can lead to conflicts if used simultaneously. Here's a breakdown of each LED's function, GPIO assignment, and usage examples.

🔴 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
⚠️ Both the Blue LED and WS2812 share GPIO8 and use different signal types (digital vs. timing-based), which means they cannot be reliably used at the same time.

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 →

🌈 WS2812 LED – Programmable RGB

GPIO: GPIO8
Control: Adafruit NeoPixel library (recommended)
⚠️ Both the Blue LED and WS2812 share GPIO8 and use different signal types (digital vs. timing-based), which means they cannot be reliably used at the same time.

Arduino (Adafruit NeoPixel) Example:

#include 

#define PIN        8
#define NUMPIXELS  1

Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  pixels.begin();
}

void loop() {
  pixels.setPixelColor(0, pixels.Color(255, 0, 0));
  pixels.show();
  delay(1000);

  pixels.setPixelColor(0, pixels.Color(0, 255, 0));
  pixels.show();
  delay(1000);

  pixels.setPixelColor(0, pixels.Color(0, 0, 255));
  pixels.show();
  delay(1000);
}

ESPHome (NeoPixelBus) Example:

light:
  - platform: neopixelbus
    type: GRB
    pin: 8
    num_leds: 1
    name: "Onboard RGB LED"

ESPHome NeopixelBus Documentation →

ESP32 C3 Super Mini Plus 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

ESP32 C3 Super Mini Plus 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 Plus Pins Mapping Arduino IDE

Below you can find the ESP32 C3 Super Mini Plus 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		RGB_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 Plus 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 Plus development board by default is qio and qio respectively.