How to Use ESP32 C3 SUPER MINI: Examples, Pinouts, and Specs

The ESP32 C3 SUPER MINI, manufactured by MIRANDA, is a compact and powerful microcontroller designed for IoT applications and embedded systems. It features integrated Wi-Fi and Bluetooth Low Energy (BLE) capabilities, making it an excellent choice for wireless communication projects. Its small form factor and robust performance make it ideal for space-constrained designs while maintaining high efficiency and versatility.

• Smart home devices (e.g., smart lights, thermostats)
• Wearable technology
• Industrial IoT systems
• Wireless sensor networks
• Remote monitoring and control
• Prototyping and educational projects

The following table outlines the key technical details of the ESP32 C3 SUPER MINI:

The ESP32 C3 SUPER MINI has a total of 22 GPIO pins, which can be configured for various functions. Below is the pinout description:

1. Power Supply: Connect the 3V3 pin to a 3.3V power source and GND to ground.
2. Programming: Use a USB-to-UART adapter to connect the module to your computer. Connect:
   • TX of the adapter to RX (IO1) of the ESP32 C3 SUPER MINI.
   • RX of the adapter to TX (IO0) of the ESP32 C3 SUPER MINI.
   • GND of the adapter to GND of the ESP32 C3 SUPER MINI.
3. Enable Pin: Ensure the EN pin is pulled high to enable the module.
4. GPIO Configuration: Configure the GPIO pins as needed for your application (e.g., input, output, ADC, PWM).
5. Programming Environment: Use the Arduino IDE or ESP-IDF (Espressif IoT Development Framework) to write and upload code.

• Voltage Levels: Ensure all connected peripherals operate at 3.3V logic levels to avoid damaging the module.
• Antenna Placement: Keep the onboard antenna area clear of metal objects or enclosures to maintain optimal wireless performance.
• Power Supply: Use a stable power source to avoid unexpected resets or performance issues.
• Deep Sleep Mode: Utilize the deep sleep mode to minimize power consumption in battery-powered applications.

Below is an example of how to blink an LED connected to GPIO2 of the ESP32 C3 SUPER MINI using the Arduino IDE:

// Define the GPIO pin for the LED
#define LED_PIN 2

void setup() {
  // Initialize the LED pin as an output
  pinMode(LED_PIN, OUTPUT);
}

void loop() {
  // Turn the LED on
  digitalWrite(LED_PIN, HIGH);
  delay(1000); // Wait for 1 second

  // Turn the LED off
  digitalWrite(LED_PIN, LOW);
  delay(1000); // Wait for 1 second
}

1. Module Not Detected by Computer

   • Ensure the USB-to-UART adapter is properly connected.
   • Verify that the correct COM port is selected in the Arduino IDE or ESP-IDF.
   • Check the drivers for the USB-to-UART adapter.

2. Wi-Fi Connection Fails

   • Verify the SSID and password in your code.
   • Ensure the router is operating on the 2.4 GHz band (not 5 GHz).
   • Check for interference from other devices.

3. Program Upload Fails

   • Ensure the EN pin is pulled high.
   • Press and hold the RST button while uploading the code.
   • Verify the correct board and settings are selected in the Arduino IDE.

4. Unstable Operation

   • Use a stable and sufficient power supply.
   • Check for loose connections or short circuits.

Q: Can the ESP32 C3 SUPER MINI operate on 5V?
A: No, the module operates at 3.3V. Connecting 5V directly to the module may damage it.

Q: How do I reset the module?
A: You can reset the module by pulling the RST pin low momentarily.

Q: Can I use the ESP32 C3 SUPER MINI with Bluetooth and Wi-Fi simultaneously?
A: Yes, the module supports simultaneous use of Bluetooth and Wi-Fi, but performance may vary depending on the application.

Q: What is the maximum range of the Wi-Fi and Bluetooth?
A: The Wi-Fi range is approximately 30 meters indoors and 100 meters outdoors, while Bluetooth range is around 10 meters indoors.