Keyestudio 5V/16MHZ ProMini Original ATMEGA328P Development Board For Arduino DIY Projects

The Keyestudio Pro Mini is an ultra-compact microcontroller board based on the ATmega328P, designed specifically for space-constrained projects and breadboard prototyping. It is an ideal choice for advanced hobbyists, students and makers who want to permanently embed an Arduino-compatible board into their custom builds without the bulk of a standard Uno.

Compact ATmega328 microcontroller

Built around the ATmega328P-AU chip, this board offers reliable processing power in a highly reduced footprint. It is specifically designed for permanent installation in projects where space is at a premium and breadboard compatibility is essential.

Versatile input and output pins

The board features 14 digital input/output pins, including 6 that can be used as PWM outputs (D3, D5, D6, D9, D10, and D11). It also provides 8 analogue input pins labelled A0 to A7 for connecting various sensors.

Flexible power supply options

You can power the board directly with a regulated 5V DC supply via the 5V and GND pins. Alternatively, it supports an external DC 7-9V power supply connected through the Vin and GND female headers.

External serial programming required

To keep the footprint as small as possible, this board does not include an on-board USB-to-serial connection. Programming and TTL level serial communication via the RX/TX pins require an external USB-to-serial module.

Integrated crystal and reset button

The board is equipped with a 16 MHz crystal oscillator to ensure accurate timing for your code execution. A physical reset button is also onboard for easy system restarts during testing and debugging.