4
Beginner
Project guide
Wiring
The circuit is fairly straightforward and can be assembled well within an hour
Headers (included with Trinket) may be soldered to facilitate attachment to a breadboard or proto board. Other parts may be pressed into the breadboard. Ready-made hookup wire or cut to fit wires make the connections.
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These diagrams are the same for all versions of Trinket and Gemma.
The same circuit with Gemma. The LEDs share D0. D2/A1 is hooked to the junction of the photocell and a 1000 ohm (1K) resistor. If you wish to just rely on the power pack on/off switch, you can eliminate the photocell and 1K resistor.
The battery pack works well with wearables. It has a JST connector to plug directly into Gemma. It also has the on/off switch to save power when the circuit is not being used.
Page last edited December 01, 2025
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