Use:

• The Arduino Pro Mini can be programmed with the Arduino software download.
• Project Hub: this is a large collection of Arduino projects to try.
• Programming Forum: this platform is a place to find help for programming the Arduino Pro Mini generic.
• Power. This can be a regulated +5V power source (e.g. from the +5V pin of the Mini USB Adapter or an Arduino NG) connected to the +5V pin of the Arduino Mini. Or, a +9V power source (e.g. a 9-volt battery) connected to the +9V pin of the Arduino Mini.
• Ground. One of the ground pins on the Arduino Mini must be connected to the ground of the power source.
• TX/RX. These pins are used both for uploading new sketches to the board and communicating with a computer or other device.
• Reset. Whenever this pin is connected to the ground, the Arduino Mini resets. You can wire it to a pushbutton, or connect it to +5V to prevent the Arduino Mini from resetting (except when it loses power). If you leave the reset pin unconnected, the Arduino Mini will reset randomly.
• An LED. While not technically necessary, connecting an LED to the Arduino Mini makes it easier to check if it’s working. Pin 13 has a 1 KB resistor on it, so you can connect an LED to it directly between it and the ground. When using another pin, you will need an external resistor.