ARDUINO Pro Mini ATmega328 3.3V-8MHz

The Arduino Pro Mini ATmega328 3.3V / 8MHz is a minimalist Arduino-compatible development board designed for users who need the full power of the ATmega328 microcontroller in a much smaller and lighter package. It is the perfect choice for permanent embedded installations, wearable electronics, drones, IoT nodes, and any project where space, weight, or power consumption are critical factors.

Built around the ATmega328P, the same microcontroller found in the Arduino Nano and Arduino Uno, the Pro Mini offers excellent compatibility with virtually all Arduino libraries and code examples available online. Unlike the Uno or Nano, however, it does not include an onboard USB-to-Serial converter, which keeps both the price and the physical footprint to a minimum. Programming is performed through an external FTDI or CP2102 USB-to-UART bridge adapter, connected to the dedicated 6-pin programming header.

This 3.3V variant runs at a clock speed of 8MHz, making it especially suitable for projects involving 3.3V sensors and modules such as NRF24L01 transceivers, ESP-01 Wi-Fi modules, and various IMUs and SD card modules — without the need for level shifters. The board includes 14 digital input/output pins (with 6 PWM channels) and 8 analog inputs, providing more analog channels than the standard Arduino Uno. With 32KB of flash memory (2KB used by the bootloader), 2KB of SRAM, and 1KB of EEPROM, it has ample resources for a wide variety of mid-complexity Arduino sketches.

The Pro Mini comes pre-flashed with the Arduino bootloader, allowing immediate programming through the standard Arduino IDE with the appropriate board selection. Its breadboard-friendly pin layout makes it ideal for both prototyping and final product integration.

Specifications

• Microcontroller: ATmega328P
• Operating Voltage: 3.3V logic level
• Recommended Input Voltage: 3.35 – 12V
• Maximum Input Voltage: 7 – 20V (via RAW pin)
• Clock Speed: 8 MHz
• Digital I/O Pins: 14 (6 with PWM output)
• Analog Input Pins: 8 (ADC)
• Flash Memory: 32 KB (≈0.5 KB used by bootloader)
• SRAM: 2 KB
• EEPROM: 1 KB
• Programming Interface: 6-pin FTDI / USB-to-UART header
• Bootloader: Pre-installed Arduino Bootloader
• Form Factor: Compact, breadboard-friendly
• IDE Compatibility: Arduino IDE (select "Arduino Pro or Pro Mini, ATmega328 (3.3V, 8MHz)")

Applications

• IoT Devices and Smart Sensors with 3.3V wireless modules
• Wearable Electronics where size and weight matter
• Drones, RC Vehicles, and Robotics as a flight or motion controller
• Wireless Sensor Nodes using NRF24L01, LoRa, or ESP-01
• Battery-Powered Embedded Systems with low-power requirements
• Home Automation Projects for switches, sensors, and controllers
• Educational STEM Projects for advanced Arduino learners
• Custom Electronic Gadgets integrated into final enclosures
• Wireless Remote Controls and Receivers
• Data Loggers for environmental, motion, and biometric data
• Prototyping before transitioning to a custom PCB
• Replacements for Arduino Uno in compact, embedded designs

Note: Programming requires an external USB-to-UART (FTDI / CP2102) adapter. Always select the correct 3.3V / 8MHz variant in the Arduino IDE to ensure proper sketch timing and uploading.