World's thinnest keychain flashlight (and shopping cart coin)
Description
This is an only 2 mm thick flashlight (thinner than a credit card flashlight) which can also be used as a removable shopping cart coin that I made primarily for my key organizer, (hence the slim design). I made two different versions: a coin and a key chain. Just slide it into the shopping cart, release the cart, pull out the keychain and put it in your pocket again. The diameter is slightly smaller than a one euro coin, so the cart gets released but the key chain can be pulled back out. This worked with all the carts I've tested so far. The flashlight is powered by a CR1216 button cell. The lamp is a flat 2x3x4 mm led like this one: https://www.amazon.com/Rectangle-Transparent-Lighting-Electronics-Components/dp/B01C5HL0PO/ You also need electrically conductive adhesive/paint, as shown in the picture. Aluminum foil can also work, but it is much more difficult to fix it properly. The flexibility of the painted wall and the 0.1 mm distance to the battery serve as a simple switch.
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