Postbox notification

thingiverse

This is a high-tech enclosure for a 443 MHz radio alarm system. The hardware will transmit a code over 433 MHz as soon as it gets powered up. To turn on the device, two cables need to be connected to the case. I am using a reed switch and a magnet on my mailbox that will connect the cables whenever the magnet moves away (open mailbox). #### Alert examples - Mailbox alert (as described) - Door/window sensor (with a reed switch) - Smart button (alert when the button is pressed) - When the closet was opened (with a normally closed switch) #### More resources - A detailed project description can be found on my blog: [New letter in mailbox notification with Arduino and ATtiny85](https://jwillmer.de/blog/tutorial/new-letter-in-mailbox-notification-with-arduino-and-attiny85) - The model can be found/copied and modified at [Onshape Mailbox Model](https://cad.onshape.com/documents/04cc9ffde790c244f445a191/w/332193449112b0657b7ed5d1/e/b42d4ecc18fd3f39120f373f)