Mailight

thingiverse

[](https://www.youtube.com/watch?v=k0oHYXkPr5Y) This is a solution for a small gadget to insert into your mailbox that illuminates when you open it to check for mail. This is useful since here in Sweden we only receive a few hours of sunlight every day during winter, which means I typically have to inspect my mail in the dark. Components required: - 1x Sparkfun PRT-08808 prototype board - 2x 3mm x 12mm screws - 4x rechargeable AAA batteries - 1x resistor with a resistance of 1M ohm - 1x resistor with a resistance of 10-22 ohm (You'll want it to be around 60 mA to ensure it doesn't overheat) - 1x 100 mF capacitor - 1x through-hole 555 timer - Plenty of wire - 1x NC magnetic switch (some stores may label this incorrectly, you want the one that closes the circuit when not affected by an external magnet). I often use Standex-Meder Electronics (MK04-1B90C-500W). Be sure to purchase a flange if it's sold separately. - Some battery contacts such as Keystone Electronics AA ones. The AAA ones will likely work just as well. They're quite flexible. - 1x Computer M3 chassis screw - Super glue - 2x JST female connectors - 2x JST male contacts - 1x 1W Power LED - Heat shrink or isolating tape Tools required: - A 3D printer (yeah, yeah) - Screwdriver - Soldering equipment - Something to strip/cut wires with.