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Arduino-Compatible Pro Micro ATmega32U4 5V 16MHz – Compact USB HID Dev Board

The Arduino-Compatible Pro Micro ATmega32U4 5V 16MHz is a compact, breadboard-friendly microcontroller development board built around the powerful ATmega32U4 chip. Unlike traditional Arduino boards that rely on a separate USB-to-serial converter (like the FTDI or CH340), the ATmega32U4 features a built-in full-speed USB 2.0 transceiver. This means the board can natively enumerate as a USB HID device — a keyboard, mouse, game controller, or MIDI instrument — directly from your code, without any extra hardware or firmware hacking. Measuring roughly 33mm by 18mm, this Pro Micro is significantly smaller than an Arduino Nano and fits neatly onto a standard breadboard with room to spare. It offers 18 digital I/O pins (of which 5 support hardware PWM), 9 analog input channels via a 10-bit ADC, a 16MHz crystal oscillator, and a micro-USB port for programming, power, and USB communication. The board runs at 5V logic level, making it compatible with the vast majority of sensors, modules, and shields in the Arduino ecosystem. Programming is straightforward via the Arduino IDE — simply select "Arduino Leonardo" or "Arduino Micro" from the board manager, hit upload, and you're ready to go. Thanks to the native USB Caterina bootloader, no external programmer is needed. The Pro Micro is widely loved by makers, hobbyists, and engineering students across India for building custom keyboards, macro pads, game controllers, USB dongles, and embedded automation projects. Whether you are prototyping a wearable gadget, building a DIY mechanical keyboard with QMK firmware, or creating a custom MIDI controller for your music setup, this tiny yet powerful board is the ideal brain for your next project. Its low cost, compact size, and native HID capability make it one of the most versatile Arduino-compatible boards available in the Indian market today.

Arduino-Compatible Pro Micro ATmega32U4 5V 16MHz – Compact USB HID Dev Board
₹440.00

Specifications

SRAM: 2.5 KB EEPROM: 1 KB Weight: ~4g (without headers) Max VCC: 6V (absolute maximum) Bootloader: Caterina (DFU-compatible) Dimensions: ~33 mm × 18 mm × 4 mm Clock Speed: 16 MHz (crystal oscillator) Flash Memory: 32 KB (4 KB used by bootloader) USB Interface: Micro-USB (native USB 2.0 full-speed) Microcontroller: ATmega32U4 (8-bit AVR RISC) Digital I/O Pins: 18 (5 support hardware PWM) Analog Input Pins: 9 (10-bit ADC) IDE Compatibility: Arduino IDE v1.0.1+ (select Arduino Leonardo or Micro) Operating Voltage: 5V (logic level) Input Voltage (RAW): 6V – 12V (recommended 7V–12V) DC Current per I/O Pin: 40 mA DC Current for 3.3V Pin: 50 mA

Details

The Arduino-Compatible Pro Micro ATmega32U4 is one of the most versatile and compact development boards in the maker ecosystem. Its secret weapon is the ATmega32U4 microcontroller, which integrates a USB 2.0 controller directly on the silicon. This native USB support unlocks capabilities that boards like the Uno or Nano simply cannot match without additional hardware. When you plug a Pro Micro into your computer, it can appear as a standard keyboard, mouse, joystick, or even a composite device combining all three. This makes it the go-to choice for DIY mechanical keyboard builders who use QMK firmware, custom macro-pad creators, flight-sim enthusiasts building button boxes, and anyone who wants to send keystrokes or mouse movements from physical buttons and sensors. In India, where the mechanical keyboard hobby and DIY electronics scene are booming among engineering students and young professionals, the Pro Micro has become a staple component. Beyond HID projects, the Pro Micro excels at any application where space is at a premium. With 18 digital I/O pins (5 PWM-capable) and 9 analog inputs, it packs enough GPIO for most small-to-medium projects. You can drive OLED displays, read temperature and humidity sensors, control servos and motors via driver boards, or communicate over I2C, SPI, and UART serial protocols. The 5V operating voltage means it is directly compatible with common sensors like ultrasonic distance modules (HC-SR04), PIR motion sensors, DHT11/DHT22 temperature sensors, and relay modules — all without level shifting. The board features 32KB of flash memory (4KB used by the bootloader), 2.5KB of SRAM, and 1KB of EEPROM for storing configuration data. The 16MHz clock speed provides predictable, deterministic timing — crucial for bit-banging protocols and precise PWM control. Power options are flexible: the board can be powered via the micro-USB port (5V), or through the RAW pin with an external supply of 6V to 12V (regulated down to 5V by the onboard regulator). For Indian buyers, the Pro Micro represents exceptional value at around Rs.440, delivering capabilities that rival boards costing three to five times as much. From custom input devices to compact data loggers, this board deserves a spot in every Indian maker's component bin.

Tags

arduinopro-microatmega32u4usb-hidkeyboard-controllercompact5vbreadboard-friendly