14. Closing the Lids
1. Fit heatsinks to the Pi board if you wish.
2. Connect the fan (negative wire) to the ground pin on the expansion header.
3. If the fan is 3.3V, connect the fan (positive wire) to the 3.3V pin on the expansion
header.
4. If the fan is 5V, connect the fan (positive wire) to the 5V pin on the expansion
header.
5. Ensure that the cables are neatly routed within the box, such that they will not
interfere with the fan when the lid is closed.
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Ground
5V
3.3V
Fan connections not shown