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Pro Mini 328 Development Board Compatible with Arduino - 3.3V/8MHz (With Headers)

Pro Mini comes with unsoldered headers in a package. Pro Mini is very close to Arduino Mini board respect its features. However, Pro Mini has a different pin array than Mini board. It is not possible to use one instead of the other one.

Pro Mini 328 Development Board Compatible with Arduino - 3.3V/8MHz (With Headers) Package content:

  • Pro Mini 328 Development Board for Arduino - 3.3V/8MHz
  • Male Headers

Pro Mini is a microcontroller board based on Atmega328. There are 16 digital I/O pins (6 of them are PWM out), 8 analog input pins, a 16 MHz crystal oscilator and a reset button on the board. This board is designed for the places with very limited dimensions and to use it on a breadboard. Pro Mini has no a usb socket and programmer chip. To program this board it is possible to use USB-Serial Converter or any other usb-serial converters.

There are two different versions of Pro Mini board; 3.3 V / 8 Mhz and 5 V / 16 Mhz

Pro Mini 328 Development Board Compatible with Arduino - 3.3V/8MHz (With Headers) Features:

  • Microcontroller: ATmega328
  • Operating voltage: 5 V or 3.3 V (Depends on the model.)
  • Supply voltage (recommended): 5-12 V (3.3 V model) or 7-12 V (5 V model)
  • Number of digital I/O pins: 14
  • Number of PWM pins: 6
  • Number of analog input pins: 8
  • Max DC current for each I/O pins: 40 mA
  • Flash memory: 32 kB (ATmega328, 0.5 kB is used by bootloader)
  • SRAM: 2 kB (ATmega328)
  • EEPROM: 1kB (ATmega328)
  • Clock speed: 16 MHz (5 V model) or 8 MHz (3.3 V model)

11624-min.png (113 KB)


Arduino Pro Mini can be supplied via 5V pin or an external voltage source. 5V can be connected to VCC pin. External voltage source would be an AC - DC adapter or a battery. When it is supplied with an external voltage supply or battery. The battery can be connected to the board via GND and Vin pins.

7 - 20 V can be used as an external supply but these are the limits for Uno. Recommanded voltage supply for this board is between 7 - 20 V.

Operating voltage of the Arduino Pro Mini's microcontroller is 5 V. If the voltage supplies the board via RAW pin, then this voltage is regulated to 5 V and distributed to the board by the regulator.

Power pins are like that:

  • RAW: When an external adapter is used, the voltage of the adapter is on this pin. You can supply the board by applying 7-12 V among this pin instead of the on-board power connector.
  • 5 V: The 5 V pin on the board is directly connected to the output of the regulator. If the board is supplied by an external power supply or from RAW pin then the voltage of the 5 v pin comes from output of the regulator.
  • GND: Ground pins on the board.

Note: There is not an 3.3 V regulator on this board.


Atmega328 has an 32 kB flash memory (0.5 kB of this is used by the bootloader), 2 kB SRAM and 1 kB EEPROM.

Input and Output:

All of the 14 digital pins on the Arduino Pro Mini board can be configured both as an input or an output. Even the same microcontroller is used in the Pro Mini board, there are 6 analog inputs on it. But, there are 8 analog input pins on the Mini Pro board. All of these analog pins can be configured as digital input or output. In total there are 22 digital input - output pins on the board. Logic level of these pins are all 5 V. All of these pins are able to provide an output current up to 40 mA. Additionally, some of these pins have diffrent features too, listed below:

  • Serial Communication, 0 (RX) and 1 (TX): These pins are used to recieve (RX) and Transmit (Tx) TTL data. These pins might be connected to a usb - serial converter chip to program the board, that means when the board is getting programmed or while the Pro Mini and computer is communicating these pins are in use. Becouse of this situation it is recommended not to use these pins when the other pins are free.
  • External Interrupts: By using the pins 2 (Interrupt 0), 3 (interrupt 1) you may activate interrupts respect to logic-1 and logic-0 levels and/or rising edge or falling edge. You can find the details on the attachInterrupt() function page.
  • PWM: Pins 3, 5, 6, 9, 10, 11 and 13 can provide 8-bit analog out using analogWrite() function.
  • SPI: 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK) pins are used for SPI communication.
  • Analog: A0 - A7; Pro Mini board has 8 10-bit analog input pins. These pin may be used also as digital input or output. As default, the referance range of analog inputs is between 0-5 V. This range can be changed by using AREF pin and analogReferance() function.
  • I2C, A4 (SDA) pin and A5 (SCL) pin: These pins are used for I2C serial communication.
  • AREF: The referance pin for analog input.
  • Reset: If logic-0 voltage level applied to this pin, the board resets itself.

You may view the pin mapping page from this link.


There are several options for Pro Mini to communicate with another arduino or microcontroller. Atmega328 provides UART TTL (5V) Serial communication via its 0 (RX) and 1 (TX) pins

There is a phsycally serial port on the Pro Mini board but this number can be increased with the SoftwareSerial library as software.

Atmega328 provides I2C and SPI ports too. Wire library if to use I2C and SPI library is for SPI communication.


Pro Mini board can be programmed with the Arduino computer software (Arduino IDE). To program this board it is possible to use USB-Serial Converter or any other usb-serial converters.

You can start programming by choosing Pro Mini under tools > board menu on the Arduino IDE. For details you may see the referance and the basic functions page. Atmega328 on the Pro Mini board comes together with a specific software installed, named bootloader. Thanks to this it is not needed to use an external programming device to program Pro Mini. Communication is supplied by and original STK500 protocol.

The board can be programmed by using ICSP headers via ISP programmer instead of bootloader software (bootloading the Pro Mini).

Note: Pro Mini comes with unsoldered male headers.

Pro Mini 328 Development Board Compatible with Arduino - 3.3V/8MHz (With Headers)
Pro Mini 328 Development Board Compatible with Arduino - 3.3V/8MHz (With Headers)
127.45 TL + VAT
152.94 TL
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