On little sad thing about the PocketChip is the lack of a speaker. But the guys from NextThing made it so hackable I couldn’t resist to upgrade mine. On AliExpress you find these little audio amplifier moduls for a few cents. All you need more is a speaker (or two if you like) and a few wires.
Except from luggage trunks there are other compartments wich are quite dim: Mailboxes.
In my various electronics survival boxes I found the components to solve this issue: Battery holder, Reed Relais, an old Magnet, Boost DC/DC conveter from AliExpress (LiPo Bat. to 5V USB-A Connector) and a 12 V LED strip. The LED strip had no drivin circuit on it an the forward voltage was below 5 V. So a modification from 12 V to 5 V was by changing the current limitting resistor easy. To connect the batteries to the circuit I used the Reed Relais and the Magnet. The Magnet is attached in the mailbox inner top using adhesive. The Reed Relais ist mounted on the flap by adhesive as well. Pulling the flap upwards activates the light an let you check for post in the dark :-).
by