Connect the LiPo battery to make sure that everything runs, then stack the components and fold the wires around so that nothing is protruding. If using the onboard reset button, make sure it’s on the back side where you can reach it, not blocked by the LED backpack or battery. Other than your wires, there should be no conductive parts touching between the microcontroller board and LED backpack.

The layers can be held together with a couple small pieces of foam tape, dabs of hot-melt adhesive, epoxy, etc. If you added a replay button you can encase the whole thing in a plastic bubble (such as toy vending machines dispense) with just the button protruding.

The mounting holes on the LED backpack can be used for attaching a lanyard. Plastic lace from a craft store is one option. Do not use a metal chain for this…it’s conductive and could cause an electrical short as the pendant shifts around. Another option is a pin back…we have a magnetic type in the shop, or you can find the regular variety at most sewing or craft shops…again, be careful with this bridging electrical contacts.
The little battery should last all day, depending how often you activate it. To recharge, unplug the LiPo cell from the Gemma (or JST plug if using a Trinket) and connect it to the Micro Lipo USB charger. The battery does not charge when the microcontroller is connected to USB.

This guide was first published on Oct 01, 2013. It was last updated on Jun 20, 2024.

This page (Finishing Up) was last updated on Sep 26, 2013.

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