How to Use ESP32-VROOM-32: Examples, Pinouts, and Specs

The ESP32-VROOM-32, manufactured by Diymore, is a versatile and powerful microcontroller module designed for Internet of Things (IoT) applications. It features integrated Wi-Fi and Bluetooth capabilities, a dual-core processor, and a wide range of GPIO pins. This module is ideal for embedded systems, smart devices, and wireless communication projects. Its compact design and robust performance make it a popular choice for developers and hobbyists alike.

• IoT devices and smart home automation
• Wireless sensor networks
• Wearable technology
• Industrial automation and control systems
• Robotics and drones
• Real-time data monitoring and logging

The ESP32-VROOM-32 module is packed with features that make it suitable for a variety of applications. Below are its key technical specifications:

The ESP32-VROOM-32 module has 38 pins. Below is a table describing the key pins:

Note: For a complete pinout diagram, refer to the official datasheet provided by Diymore.

The ESP32-VROOM-32 is easy to integrate into a variety of projects. Below are the steps and best practices for using the module:

1. Power Supply: Provide a stable 3.3V power supply to the 3V3 pin. If using the VIN pin, supply 5V.
2. Programming: Use a USB-to-serial adapter to connect the module to your computer. Connect:
   • TX on the adapter to RX0 (IO3) on the ESP32.
   • RX on the adapter to TX0 (IO1) on the ESP32.
   • GND on the adapter to GND on the ESP32.
3. Boot Mode: To upload code, hold the IO0 pin low (connect to GND) while resetting the module.
4. GPIO Usage: Connect peripherals (e.g., sensors, LEDs) to the GPIO pins. Ensure the pins are not overloaded with current.

• Voltage Levels: The ESP32 operates at 3.3V logic levels. Avoid connecting 5V signals directly to GPIO pins.
• Power Supply: Use a low-noise power supply to avoid interference with Wi-Fi and Bluetooth signals.
• Heat Management: The module may heat up during operation. Ensure proper ventilation or heat dissipation.
• Programming Environment: Use the Arduino IDE or ESP-IDF for programming. Install the necessary ESP32 board support package.

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

// Example: Blink an LED connected to GPIO2 on the ESP32-VROOM-32

// 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
}

Tip: Ensure the ESP32 is properly connected to your computer and the correct board and port are selected in the Arduino IDE.

1. Issue: The ESP32 is not detected by the computer.

   • Solution: Ensure the USB-to-serial adapter drivers are installed. Check the connections and ensure the module is powered.

2. Issue: Code upload fails with a timeout error.

   • Solution: Hold the IO0 pin low (connect to GND) while resetting the module to enter boot mode.

3. Issue: Wi-Fi connection is unstable.

   • Solution: Use a stable power supply and ensure the antenna is not obstructed.

4. Issue: GPIO pins are not functioning as expected.

   • Solution: Verify the pin configuration in your code. Ensure the pins are not being used for other functions (e.g., boot mode).

• Q: Can the ESP32-VROOM-32 operate on 5V logic levels?
  A: No, the ESP32 operates at 3.3V logic levels. Use a level shifter if interfacing with 5V devices.

• Q: What is the maximum current draw of the ESP32?
  A: The ESP32 can draw up to 500 mA during peak operation. Ensure your power supply can handle this.

• Q: Can I use the ESP32 with a battery?
  A: Yes, you can power the ESP32 using a 3.7V LiPo battery connected to the VIN pin.

• Q: How do I reset the ESP32?
  A: Press the EN pin or button to reset the module.

By following this documentation, you can effectively use the ESP32-VROOM-32 in your projects. For further details, refer to the official datasheet or support resources provided by Diymore.