How to Use ESP32 Mini: Examples, Pinouts, and Specs

The ESP32 Mini is a compact and versatile microcontroller module that integrates Wi-Fi and Bluetooth connectivity, making it an ideal choice for Internet of Things (IoT) projects and wireless applications. With its dual-core processor and ample GPIO pins, the ESP32 Mini is capable of handling complex tasks and can be used in a variety of applications, including smart home devices, wearable electronics, and sensor networks.

• Processor: Tensilica Xtensa® Dual-Core 32-bit LX6 microprocessor
• Operating Voltage: 3.3V
• Input Voltage (recommended): 5V
• Digital I/O Pins: 34 (GPIOs)
• Analog Input Pins: 12-bit SAR ADC up to 18 channels
• Analog Output Pins: 2 (8-bit DAC)
• Wi-Fi: 802.11 b/g/n (802.11n up to 150 Mbps)
• Bluetooth: v4.2 BR/EDR and BLE specification
• RAM: 520 KB SRAM
• Flash Memory: 4 MB
• Clock Speed: Up to 240 MHz
• Operating Temperature: -40°C to +125°C

1. Power Supply: Connect a 5V power source to the VIN pin and ground to one of the GND pins. Alternatively, you can supply 3.3V directly to the 3V3 pin.
2. Boot Mode: To upload code, ensure GPIO0 is connected to GND during power-up or reset to enter bootloader mode.
3. Serial Communication: Use GPIO1 (TX) and GPIO3 (RX) for serial communication with a computer or other devices.
4. Wi-Fi and Bluetooth: Utilize the built-in Wi-Fi and Bluetooth for wireless communication. Ensure proper antenna design or connection for optimal performance.
5. GPIO Pins: Connect sensors, actuators, or other peripherals to the GPIO pins as required by your project. Be mindful of the input/output capabilities and voltage levels of each pin.

• Use a voltage regulator to ensure a stable 3.3V supply if powering the ESP32 Mini with more than 3.3V.
• Avoid drawing more than 12 mA from any GPIO pin to prevent damage to the device.
• When using ADC pins, be aware that the input voltage range is 0 to 3.3V.
• For high-frequency signals or applications requiring precise timing, use the pins marked as HSPI (High-Speed SPI).

• Failure to Connect to Wi-Fi: Ensure the Wi-Fi credentials are correct and the ESP32 Mini is within range of the router.
• Unexpected Resets: This can be caused by an inadequate power supply. Make sure the power source can deliver sufficient current.
• GPIO Pin Not Working: Check if the pin is configured correctly in the code and that there are no shorts or open circuits in your connections.

• Improving Wi-Fi Range: Use an external antenna or ensure the onboard antenna is not obstructed.
• Code Upload Issues: If you're having trouble uploading code, ensure GPIO0 is grounded and the ESP32 Mini is in bootloader mode.
• Serial Communication Errors: Verify the baud rate and other serial settings match between the ESP32 Mini and the device it's communicating with.

#include <WiFi.h>

// Replace with your network credentials
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

void setup() {
  Serial.begin(115200);
  
  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.println("Connecting to WiFi...");
  }
  
  Serial.println("Connected to WiFi");
}

void loop() {
  // Your code here
}

Note: This example demonstrates how to connect the ESP32 Mini to a Wi-Fi network. Replace your_SSID and your_PASSWORD with your actual Wi-Fi credentials. The Serial.begin(115200); line initializes serial communication at a baud rate of 115200, which is commonly used for ESP32 modules.

For further assistance or questions, refer to the manufacturer's datasheet or contact technical support.