This step is not required unless you want to modify the source code. From a terminal/command line go to the folder/directory containing the source code and execute the following:

• make clean

• make all

This will generate a .hex file containing the compiled firmware. After connecting the teensy board you can program it as shown in the next section or, if you have installed the command line version of the teensy loader application, program it directly by executing this:

• make program

You will be requested to push the button of the teensy board. Do so and the firmware will be downloaded.

You can find a detailed description of the following steps at https://www.pj rc.com/teensy/loader.html.

• Connect the teensy board to your computer.

• Execute the teensy loader application.

• Push the button of the teensy board.

• From the File name, choose "Open HEX File" and open the .hex file containing the firmware to be programmed.

• Select "Program" from the "Operations" menu, or click the Program button on the tool bar. You should see the "Download Complete" message.

• Choose "Reboot" from the "Operations" menu, or click the Reboot button on the tool bar.

The components must be wired as shown in the following schematic:

The blue, yellow, green and red backlighted insert coin buttons must be connected to the lines vgnd1, vgnd2, vgnd3 and vgnd4 respectively. The lights of some backlighted buttons can be connected directly to a voltage of 5V like the one generated by the board. Other models may require additional series resistors in order to limit the current through the LEDs. In case of doubt look at its data sheet.