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The schematic for the board is:

RPI LED Board

Where the components are as shown here:

RPI LED Board

Some points to note:

  • The switch inputs (GPIO24 and GPIO23) would be set as pulled up inputs so that they would normally read HIGH and then go LOW when the button was pressed.
  • The signal on GPIO4 to control the fan is a 3.3V signal whereas the fan needs a 5V supply to run at full speed.
  • GPIO19 is one of the hardware PWM channels. The audio output also uses this so they can't be used at the same time.
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