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## Arduino Pro Mini

The Arduino Pro Mini is intended for advanced users who require flexibility, low-cost, and small size. It comes with the minimum of components (no on-board USB or pin headers) to keep the cost down. It's a good choice for a board you want to leave embedded in a project. Please note that the boards operates at 3.3V (unlike most other Arduino boards, which use 5V); be careful when connecting external components.

### Uploading Sketches

The board comes without built-in USB circuitry, so an off-board USB-to-TTL serial convertor must be used to upload sketches. This can be an FTDI TTL-232R-3V3 USB - TTL Level Serial Converter Cable, the SparkFun FTDI Basic Breakout Board, or any other USB to 3.3V TTL serial convertor. One convenient way to connect these is by inserting a six-pin 0.1" male pin header into the end of the FTDI cable or breakout board, and pressing it against the six hole programming header on the Mini Pro.

If using the FTDI cable on Windows, you'll need to make one configuration change to enable the auto-reset. With the board connected, open the Device Manager (in Control Panels > System > Hardware), and find the USB Serial Port under Ports. Right-click and select properties, then go to Port Settings > Advanced and check Set RTS on Close under Miscellaneous Options.

In Arduino 0011, use the LilyPad Arduino entry in the Tools > Board menu to compile and upload sketches to the Arduino Pro (do not burn the bootloader to the Arduino Pro from Arduino 0011). Arduino 0012 will include specific support for the Arduino Pro Mini.

The Arduino Pro Mini connected to (and powered by) an FTDI TTL-232R-3V3 USB - TTL Level Serial Converter Cable. The green and black wires align with the labels "GRN" and "BLK" written next to the holes.

The Arduino Pro Mini connected to (and powered by) a SparkFun FTDI Basic Breakout Board and USB Mini-B cable.

### Power

The board can be powered through USB via the six-pin programming header, or from a regulated 3.3V supply applied to the VCC pin or an unregulated supply on the RAW pin.

### Connectors

Any standard 0.1" spaced header can be soldered to the holes on the Arduino Pro Mini. To use every pin requires two 12-pin headers, plus a six pin header for programming, if desired. Bare wire can also be soldered directly to the holes.

The text of the Arduino getting started guide is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the guide are released into the public domain.

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