ESP32 C3 Super Mini Plus 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 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 ESP32 C3 Super Mini Plus
Starting from
5$ per unit
Prices are subject to change. We earn from qualifying purchases as an Amazon Associate.
📋 Technical Specifications
Complete technical specification details for ESP32 C3 Super Mini Plus
🛰️ Connectivity
🧠 Microcontroller
✨ Features & Pins
- • Red PCB variant
- • Ultra-low power consumption: deep sleep power consumption of about 43μA
- • Onboard RGB LED for multi-color status indication
3D Printed Cases
Professional enclosures for ESP32 C3 Super Mini Plus
Features:
ESP32 C3 Super Mini Plus Pinout Diagram
Complete pin reference for ESP32 C3 Super Mini Plus
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
These pins are safe for general GPIO usage without boot or system conflicts
💡 Why Are These Pins Safe?
⚠️ Pins to Avoid or Use with Caution
Reserved for critical functions. Misuse may cause boot failures, programming issues, or system conflicts.
Boot behavior & flash voltage
Low-level debugging interface
USB Serial/JTAG communication
Memory & PSRAM connections
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 Plus Additional Information
More details about ESP32 C3 Super Mini Plus
On-Board LEDs
LED indicators on ESP32 C3 Super Mini Plus
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.
void setup() {
pinMode(8, OUTPUT);
}
void loop() {
digitalWrite(8, HIGH);
delay(1000);
digitalWrite(8, LOW);
delay(1000);
}
output:
- platform: gpio
pin: 8
id: blue_led
light:
- platform: binary
name: "Blue LED"
output: blue_led
🌈 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.
#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);
}
light:
- platform: neopixelbus
type: GRB
pin: 8
num_leds: 1
name: "Onboard RGB LED"Useful Links
Datasheets and resources for ESP32 C3 Super Mini Plus
ESP32 C3 Super Mini Plus Custom Pin Mapping
Pin configuration and GPIO mapping for ESP32 C3 Super Mini Plus
| 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) |
Pin Mappings
Complete pinout and GPIO mapping for ESP32 C3 Super Mini Plus
| Pin | Analog | Touch | PWM | 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 |
Default Tools & Configuration
Build and upload settings for ESP32 C3 Super Mini Plus
| 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) |
The ESP32 C3 Super Mini Plus uses esptool_py for uploads , esp_ota for OTA updates, and esptool_py bootloader at 0x0.
Flash mode: qio | Boot mode: qio
Max sketch size: 1280 KB | Max data size: 320 KB
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