ESP32 C3 Super Mini Development Board Pinout and Technical Specifications
Code name: ESP32C3_DEV
ESP32 C3 Super Mini development board is based on esp32c3 microcontroller and uses riscv32 architecture. This development board has a maximum CPU frequency of 160 MHz and a flash size of 4MB.
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π ESP32 C3 Super Mini Description
β οΈ 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), itβs perfect for IoT projects that need reliable wireless connectivity. πΆ
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 π and a bootloader mode button, making development and debugging smooth. π
With its versatile interfaces (UART, I2C, SPI) and plenty of GPIOs, the ESP32-C3 SuperMini is a great choice for your next embedded project! βοΈ
π ESP32 C3 Super Mini Case / Enclosure
Looking for a case to finish up your project with ESP32 C3 Super Mini? Check our π Etsy Store.
We offer a variety of enclosures for the ESP32 C3 Super Mini, available in different colors and configurations β with or without header pins, and more! You can also choose between a hexagon-patterned lid for improved heat dispersion βοΈ or a solid lid for a sleek finish.
On our π Etsy Store, you can find cases for different ESP32 development boards, the ESP32 boards with senors, screens, etc. The stock is always filling up! π¦
Need a custom case? βοΈ Contact Us on Etsy Store or our Contact Form
π ESP32 C3 Super Mini Specs
Below you can find the specifications of ESP32 C3 Super Mini, such as features, connectivity options, and ESP32 C3 Super Mini technical specs.
β¨ Features
- Ultra-small size: As small as the thumb (22.52 x 18 mm)
- Ultra-low power consumption: deep sleep power consumption of about 43ΞΌA
- Onboard LED blue light: GPIO8 pin
- 11 digital IO pins
- 22 external interrupt pins
- 6 analog input pins
- 11 PWM pins
π°οΈ Connectivity
- WiFi: 802.11 b/g/n (2.4 GHz)
- Bluetooth: 5.0
- WiFi: 5.0
π Technical specs
| Clock Speed | 160 MHz |
| Flash size | 4MB |
| Microcontroller | esp32c3 |
| Architecture | riscv32 |
π 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.
β οΈ 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. Below is a list of pins to avoid or use with caution, categorized for clarity:
- π οΈ Strapping Pins (Boot Mode & System Behavior) - These pins control boot behavior and flash voltage selection. Pulling them high or low at reset can impact boot mode selection, voltage settings, or debugging access. Avoid altering their state unless necessary.
- π JTAG Debugging Pins - JTAG is used for low-level debugging and programming. If JTAG is enabled, these pins must remain dedicated to it. Repurposing them as GPIO can disable JTAG debugging features.
- π USB Communication Pins - These pins are used for USB Serial/JTAG communication. If USB debugging or communication is required, they should not be reassigned as GPIO.
- β‘ Flash Memory & SPI Pins - Certain GPIOs are hardwired to SPI flash memory and PSRAM. Using them as standard GPIOs may result in system instability, corrupted storage, or boot failure.
- π‘ UART Serial Communication Pins - By default, these pins are used for serial debugging, console output, and firmware uploads. Repurposing them for general I/O may break UART programming or debugging capabilities.
| PIN | Label | Reason | Function |
|---|---|---|---|
| IO2 | GPIO2 | Must be held high during boot (if low on reset, normal flash boot may fail) | π οΈ Strapping |
| IO4 | MTMS | Used during boot; JTAG TMS for debugging; acts as Quad-SPI flash IO (hold data line) in internal-flash variants | π JTAG |
| IO5 | MTDI | Used during boot; JTAG TDI for debugging; acts as Quad-SPI flash IO (write-protect data line) in internal-flash variants | π JTAG |
| IO6 | MTCK | Used during boot; JTAG TCK for debugging; provides flash clock in internal-flash variants | π JTAG |
| IO7 | MTDO | Used during boot; JTAG TDO for debugging; acts as Quad-SPI flash IO (data line) in internal-flash variants | π JTAG |
| IO8 | GPIO8 | Must be held high during reset (if low, UART flashing/boot may not work) | π οΈ Strapping |
| IO9 | GPIO9 | Controls boot mode on reset (HIGH for normal flash boot, LOW enters serial download mode) | π οΈ Strapping |
| IO21 | U0TXD | Used as UART0 transmit (console/bootloader); repurposing may disable serial console output and printing | π‘ UART |
| IO20 | U0RXD | Used as UART0 receive (console/bootloader); repurposing may disable serial programming and debug logs | π‘ UART |
π Key Takeaway:
- Before using any GPIO, check if it is assigned a critical function.
- Avoid using bootstrapping pins unless you're modifying boot behavior intentionally.
- If JTAG debugging is needed, ensure its pins remain free.
- USB and Flash-related GPIOs should remain dedicated unless you disable their default functions.
β Pins Safe to use
- πΉ IO0
- πΉ IO1
- πΉ IO3
- πΉ IO10
Unlike restricted pins, these GPIOs are not tied to essential system functions like π οΈ bootstrapping, π USB communication, π JTAG debugging, or β‘ SPI flash memory, making them the best choices for custom applications and general use.
Why Are These Pins Safe?- Not involved in bootstrapping β These GPIOs do not affect the deviceβs boot mode or system startup.
- Not linked to flash memory or PSRAM β They wonβt interfere with storage or memory access.
- Not dedicated to USB or JTAG β They remain free for general use without affecting debugging or programming.
- No special hardware connections β Unlike some pins that are internally wired to system functions, these remain freely assignable.
πΊοΈ ESP32 C3 Super Mini External Pins Mapping Functions
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 an 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) |
πΊοΈ 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 an external interrupt pins , 6 as analog input pins and 11 pins have Pulse-Width Modulation (PWM) .
| Pin | Analog | Touch | PWM | 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 |
π οΈ Default Tools
| Bootloader tool | esptool_py |
| Uploader tool | esptool_py |
| Network uploader tool | esp_ota |
| Bootloader address | 0x0 |
| Flash mode | qio |
| Boot mode | qio |
| PSRAM type | |
| 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.
