How to Use WeMos LOLIN D32 V1.0.0 ESP-32 WiFi-Bluetooth Combo: Examples, Pinouts, and Specs

The WeMos LOLIN D32 V1.0.0 (ESP-WROOM-32) is a powerful and versatile development board designed by WEMOS/LOLIN. It is based on the ESP32 chip, which integrates dual-core processing, WiFi, and Bluetooth capabilities. This board is ideal for Internet of Things (IoT) projects, wireless communication, and applications requiring high performance and connectivity.

• IoT devices and smart home automation
• Wireless sensor networks
• Bluetooth Low Energy (BLE) applications
• Robotics and remote control systems
• Data logging and real-time monitoring
• Prototyping and development of connected devices

The following table outlines the key technical specifications of the LOLIN D32 V1.0.0:

The LOLIN D32 V1.0.0 features a 30-pin layout. Below is the pin configuration:

1. Powering the Board:

   • Connect the board to a computer or USB power source using a Micro-USB cable.
   • Alternatively, supply 3.3V to the 3V3 pin or 5V to the VIN pin.

2. Programming the Board:

   • Install the Arduino IDE and add the ESP32 board support via the Board Manager.
   • Select "LOLIN D32" as the board type in the Arduino IDE.
   • Connect the board to your computer and select the appropriate COM port.

3. Connecting Peripherals:

   • Use the GPIO pins to connect sensors, actuators, or other peripherals.
   • Ensure that the voltage levels of connected devices are compatible with the 3.3V logic of the ESP32.

4. Uploading Code:

   • Write or load a sketch in the Arduino IDE.
   • Click the "Upload" button to flash the code to the board.

• Voltage Levels: The GPIO pins operate at 3.3V. Avoid applying 5V directly to the pins to prevent damage.
• Deep Sleep Mode: Use deep sleep mode to minimize power consumption in battery-powered applications.
• Pin Multiplexing: Many GPIO pins have multiple functions (e.g., ADC, PWM, I2C). Refer to the ESP32 datasheet for details.
• External Antenna: For better WiFi performance, ensure the onboard antenna is not obstructed.

Below is an example of using the LOLIN D32 to blink an LED connected to GPIO2:

// Example: Blink an LED connected to GPIO2 on the LOLIN D32

void setup() {
  pinMode(2, OUTPUT); // Set GPIO2 as an output pin
}

void loop() {
  digitalWrite(2, HIGH); // Turn the LED on
  delay(1000);           // Wait for 1 second
  digitalWrite(2, LOW);  // Turn the LED off
  delay(1000);           // Wait for 1 second
}

1. Board Not Detected in Arduino IDE:

   • Ensure the correct USB driver is installed for the ESP32.
   • Check that the correct COM port is selected in the Arduino IDE.

2. Upload Fails with Timeout Error:

   • Press and hold the "BOOT" button on the board while uploading the code.
   • Release the button once the upload starts.

3. WiFi Connection Issues:

   • Verify the SSID and password in your code.
   • Ensure the board is within range of the WiFi router.

4. Power Issues:

   • Use a reliable power source to avoid instability.
   • Check the voltage and current requirements of connected peripherals.

• Q: Can I use the LOLIN D32 with MicroPython?
  A: Yes, the LOLIN D32 supports MicroPython. You can flash the MicroPython firmware to the board.

• Q: What is the maximum current output of the 3V3 pin?
  A: The 3V3 pin can supply up to 500 mA, depending on the input power source.

• Q: How do I reset the board?
  A: Press the "RST" button on the board to perform a hardware reset.

• Q: Can I use the LOLIN D32 for battery-powered applications?
  A: Yes, the board supports low-power modes, making it suitable for battery-powered projects.