A slide switch will need to be wired to the Trinket/ItsyBitsy Lipo Backpack. This PCB enables the ItsyBitsy M4 to have USB battery recharging.
Connect a short 2-wire ribbon cable to the slide switch. The ideal length of wire is around 2.5cm (1in) which is pretty short! Note the pins on the switch have been shorted. Only use the middle pin and either far left or right pin.
The pins on the Trinket/ItsyBitsy Lipo Backpack need to be cut in order to enable on/off switch functionality. Use diagonal flush snips to cut the trace. Use the mounting hole as an anchor.
Solder the two wires from the slide switch to the switch pins on the Trinket/ItsyBitsy Lipo Backpack. Solder the wires from the top of the PCB.
Wire for Lipo Backpack
Measure and cut a 30.5cm (12in) 3-wire ribbon cable. This will be used to connect the Trinket/ItsyBisty Lipo Backpack to the ItsyBisty M4.
Cut Ground Short
Measure out one wire to be 9cm (3.5in) in length. Use wire cutters to cut the wire. Peal away the (longer) excess wire from the 3-wire ribbon cable. The shorter wire will be connected to one of the ground pads on the left ring.
Connect Cable to Lipo Backpack
Solder the three wires to the pins on the back of the Trinket/ItsyBitsy Lipo Backpack. Ensure the short wire is soldered to the ground pin. The installation requires the wires to be soldered from the bottom of the PCB.