How to Use Arduino Micro Pro: Examples, Pinouts, and Specs

The Arduino Micro Pro is a compact and versatile microcontroller board designed by Arduino, based on the ATmega32U4 microcontroller. It features built-in USB connectivity, making it ideal for projects requiring direct communication with a computer. With its small form factor, the Arduino Micro Pro is perfect for embedded systems, wearable devices, and other space-constrained applications.

• USB-based projects such as keyboards, mice, and game controllers
• Wearable electronics and IoT devices
• Robotics and automation systems
• Prototyping for small-scale embedded systems
• Sensor integration and data logging

The following table outlines the key technical details of the Arduino Micro Pro:

The Arduino Micro Pro has 24 pins, including power, digital I/O, and analog input pins. Below is a detailed pinout description:

1. Powering the Board:

   • Connect the board to your computer via a USB cable for power and programming.
   • Alternatively, supply power through the VIN pin (7-12V recommended) or the RAW pin (6-20V).

2. Programming the Board:

   • Open the Arduino IDE on your computer.
   • Select Arduino Leonardo as the board type (since the Micro Pro uses the same ATmega32U4 microcontroller).
   • Connect the board via USB and select the appropriate COM port.
   • Write your code and upload it to the board.

3. Connecting Components:

   • Use the digital I/O pins for controlling LEDs, relays, or other digital devices.
   • Use the analog input pins to read sensor data (e.g., temperature, light, or potentiometers).
   • For communication, use the UART (TX/RX), I2C (SDA/SCL), or SPI pins.

• Avoid exceeding the maximum current rating of 20 mA per I/O pin to prevent damage.
• Use pull-up or pull-down resistors for stable digital input readings.
• When using the board in USB HID (Human Interface Device) mode, ensure proper USB driver installation.
• For power-hungry peripherals, consider using an external power source instead of USB power.

The following example demonstrates how to blink an LED connected to pin 13 of the Arduino Micro Pro:

// This example code blinks an LED connected to pin 13 of the Arduino Micro Pro.
// The LED will turn on for 1 second and off for 1 second in a loop.

void setup() {
  pinMode(13, OUTPUT); // Set pin 13 as an output pin
}

void loop() {
  digitalWrite(13, HIGH); // Turn the LED on
  delay(1000);            // Wait for 1 second
  digitalWrite(13, LOW);  // Turn the LED off
  delay(1000);            // Wait for 1 second
}

The following example reads data from a sensor connected to analog pin A0 and prints the value to the Serial Monitor:

// This example reads an analog value from pin A0 and prints it to the Serial Monitor.

void setup() {
  Serial.begin(9600); // Initialize serial communication at 9600 baud
}

void loop() {
  int sensorValue = analogRead(A0); // Read the analog value from pin A0
  Serial.println(sensorValue);      // Print the value to the Serial Monitor
  delay(500);                       // Wait for 500 milliseconds
}

1. The board is not recognized by the computer:

   • Ensure the USB cable is functional and supports data transfer.
   • Check that the correct drivers are installed for the Arduino Micro Pro.

2. Unable to upload code to the board:

   • Verify that the correct board type (Arduino Leonardo) is selected in the Arduino IDE.
   • Ensure the correct COM port is selected.
   • Press the reset button on the board before uploading the code.

3. The board is not powering on:

   • Check the power source and ensure it meets the voltage requirements.
   • Inspect the USB cable or external power connections for faults.

4. Erratic behavior or unexpected resets:

   • Ensure the power supply is stable and not fluctuating.
   • Avoid drawing excessive current from the I/O pins.

Q: Can the Arduino Micro Pro act as a USB keyboard or mouse?
A: Yes, the ATmega32U4 microcontroller supports USB HID functionality, allowing the board to emulate a keyboard, mouse, or other USB devices.

Q: What is the difference between the Arduino Micro Pro and the Arduino Leonardo?
A: Both boards use the ATmega32U4 microcontroller, but the Micro Pro is smaller and more compact, making it suitable for space-constrained projects.

Q: Can I power the board with a 3.7V LiPo battery?
A: No, the recommended input voltage is 7-12V via the VIN pin. For lower voltages, use a step-up converter to meet the required input voltage.

Q: How do I reset the board manually?
A: Press the reset button on the board to restart the microcontroller. This is useful for troubleshooting or entering the bootloader mode.