Tilt and rotate the back so that the Circuit Playground Express can fit into the opening.

Press the back piece so that it snaps into place.

Optional: Power Switch

If you prefer a way to turn the circuit on and off without popping off the back of the heart, you can easily solder together a small switch for this purpose.

Power Circuit

Create a small power switch for the battery.

Solder two wires to the slide switch. Insert these wires into the heart through the aorta.

Cut the ends off a JST extension cable. Strip the tips and solder the black (GND) wires together.

Solder the switch so that it connects the red wires together. You now have a small and effective power switch!

With an external switch you can now turn on/off power without having to unplug the battery.

This guide was first published on Sep 13, 2019. It was last updated on Sep 13, 2019.

This page (Assemble) was last updated on Sep 10, 2019.

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