How to Use ESP32 (30 pin): Examples, Pinouts, and Specs

The ESP32 is a powerful microcontroller developed by Arduino, with the manufacturer part ID "UNO." It features built-in Wi-Fi and Bluetooth capabilities, making it an excellent choice for Internet of Things (IoT) applications, smart devices, and embedded systems. With its 30-pin configuration, the ESP32 offers a wide range of input/output (I/O) options, enabling seamless integration with sensors, actuators, and other peripherals.

• IoT devices and smart home automation
• Wireless sensor networks
• Wearable technology
• Robotics and automation systems
• Data logging and remote monitoring
• Prototyping and educational projects

The ESP32 (30 pin) microcontroller is designed to deliver high performance and versatility. Below are its key technical specifications:

The ESP32 (30 pin) has a versatile pinout. Below is a table summarizing the key pins and their functions:

The ESP32 (30 pin) is easy to use in a variety of projects. Below are step-by-step instructions for using it in a circuit:

1. Powering the ESP32:

   • Use the VIN pin to supply 7-12V, or connect a USB cable to power the board.
   • Ensure the GND pin is connected to the ground of your circuit.

2. Connecting Peripherals:

   • Use the GPIO pins to connect sensors, actuators, or other devices.
   • For analog sensors, connect them to ADC pins (e.g., IO32, IO33).
   • For communication, use UART, SPI, or I2C pins as needed.

3. Programming the ESP32:

   • Install the Arduino IDE and add the ESP32 board support package.
   • Connect the ESP32 to your computer via USB.
   • Select the correct board and port in the Arduino IDE.

Here is an example of how to blink an LED connected to GPIO2:

// Define the GPIO pin where the LED is connected
#define LED_PIN 2

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

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

• Voltage Levels: Ensure all connected devices operate at 3.3V logic levels to avoid damaging the ESP32.
• Deep Sleep Mode: Use deep sleep mode to conserve power in battery-powered applications.
• Boot Mode: GPIO0 must be pulled low during boot to enter programming mode.
• Wi-Fi and Bluetooth: Avoid using GPIO pins 1, 3, 9, 10, and 11 for other purposes when Wi-Fi or Bluetooth is active.

1. ESP32 Not Detected by Arduino IDE:

   • Ensure the correct board and port are selected in the Arduino IDE.
   • Install the ESP32 board support package if not already installed.

2. Upload Fails with "Failed to Connect" Error:

   • Press and hold the "BOOT" button on the ESP32 while uploading the code.

3. Wi-Fi Connection Issues:

   • Double-check the SSID and password in your code.
   • Ensure the Wi-Fi network is within range.

4. Random Resets or Instability:

   • Verify that the power supply provides sufficient current (at least 500mA).
   • Use decoupling capacitors to stabilize the power supply.

Q: Can the ESP32 operate on 5V logic?
A: No, the ESP32 operates on 3.3V logic. Using 5V logic can damage the board.

Q: How do I reset the ESP32?
A: Press the "EN" button on the board to reset the ESP32.

Q: Can I use the ESP32 with an external antenna?
A: Yes, some ESP32 models support external antennas. Check the specific model for details.

Q: How do I enable deep sleep mode?
A: Use the esp_deep_sleep_start() function in your code to enable deep sleep mode.

This documentation provides a comprehensive guide to using the ESP32 (30 pin) microcontroller. For further assistance, refer to the official Arduino documentation or community forums.