Pro Micro ATmega32U4 16MHz 5V Type C

The Pro Micro is a compact ATmega32U4 development board that packs native USB HID capability into an 18 x 33mm footprint, making it one of the smallest fully-featured Arduino-compatible boards available. Because the ATmega32U4 has USB built directly into the chip, this board can present itself to a computer as a keyboard, mouse, MIDI device, joystick, or generic serial port without needing any extra USB-to-serial hardware. This updated version swaps the older micro-USB port for a modern, reversible USB Type-C connector, making day-to-day plugging in more convenient.

Running at 5V and 16MHz with 32KB of flash, 2.5KB of SRAM, and 1KB of EEPROM, the board exposes 18 digital I/O pins (5 with PWM) and 9 analog input channels, along with hardware UART, SPI, and I2C for interfacing with sensors and peripherals. It can be powered directly through USB or via the RAW pin with 6-12V unregulated input, giving it flexibility for both bench prototyping and embedded builds where USB isn’t available.

This makes the Pro Micro a go-to choice for custom mechanical keyboard firmware (QMK), macro pads, flight sim and racing sim button boxes, USB joysticks, and any wearable or space-constrained project that still needs full Arduino Leonardo compatibility. It programs directly through the Arduino IDE by selecting the Leonardo or Pro Micro (5V, 16MHz) board profile, making it an easy drop-in for makers already familiar with the Arduino ecosystem.

Specification:

• Microcontroller : ATmega32U4
• Clock Speed : 16MHz
• Operating Voltage : 5V
• Input Voltage (RAW) : 6V – 12V
• Flash Memory : 32KB
• SRAM : 2.5KB
• EEPROM : 1KB
• Digital I/O Pins : 18 (5 PWM)
• Analog Inputs : 9 Channels (10-bit ADC)
• USB : Native USB Type-C (HID Support)
• Board Dimensions : 33 x 18mm