Arduino Pro Mini 5V 16MHz

The Pro Mini 5V/16MHz is basically an Uno or Nano which has been stripped down to its most basic configuration for the smallest size, lowest power and lowest cost. It is primarily designed for permanently embedding into a project.

Package Includes:

• Pro Mini 5V/16MHz
• 1×12 male headers (x2)
• 1×6 right-angle male header

Key Features of PRO MINI 5V/16MHZ:

• ATmega328 processor running at 16MHz
• 32KB Flash memory
• 14 Digital I/O
• 6 PWM shared with the digital I/O
• 8 Analog inputs of which 6 can also be used as digital I/O for a total of up to 20 digital I/O
• 1 I2C and SPI port
• 1 Hardware serial port
• 5V Operation

The small size allows you to place the Pro Mini directly into your breadboard circuit.  The small size also makes the Pro mini useful for putting down on a solder type breadboard for building into a permanent circuit.

The main impact to achieve this minimalistic state, is not having a built-in USB port. That means that a USB to serial converter needs to be used during the programming phase to download new code. The upside is the board is not carrying around an unneeded USB circuit and the resulting space, cost and power draw when it will not be used in the final application.

All the basic I/O of an Uno is still accessible on the Pro Mini.  Most of these are available on the two rows of 1×12 header pins that can fit into a breadboard.  There are a couple of exceptions.

• Pins A4 and A5 which are also the I2C SDA/CLK pins are inside and offset from pins A2 and A3.  To use these pins generally requires a header to be placed on the top side of the board.
• Pins A6 and A7 which are analog inputs are located on the end of the board and similarly would require the pins to be on the top side of the board to use.

Powering the Board

The board includes a 5V regulator and operates at 5V internally.

The pin labeled RAW is the same as VIN on most other boards.  The voltage applied to this pin feeds the on-board 5V regulator.  The input to this pin is typically 6V-12VDC.

The pins labeled VCC is on the output of the 5V regulator so 5V will be available on these pins when power is applied to the RAW input.  5V can also be applied directly to the Vcc pin instead of using the RAW input.

Note:  It is important to not apply different voltages to both the RAW and VCC pins at the same time as the two power supplies will be shorted together.

Assembling the Module

The board ships with two 1×12 male headers which can be soldered to the sides of the board.   in some applications it may be desirable to use wires or perhaps use female headers instead.

To ensure good alignment during soldering, first insert the loose headers into a solderless breadboard.  The Pro Mini can then be placed on top of the headers and soldered into place.

The right-angle header can be optionally added to the end of the board for connection to a USB to TTL serial interface adapter to allow the module to be programmed.