A device that sends a message to an MQTT-topic whenever mail is put in my mailbox. The detection is done using a reedswitch in the mailbox and a magnet on the flap.
PCB:
https://oshwlab.com/kostecki/mailbox-notifier
"BOM":
- Wemos D1 Mini (Pro model if external antenna is needed)
- Dual 18650 Battery holder (Mine is branded BeilaMoo)
- MicroWakeupper module
- 2x 18650 Lithium batteries
- TP4056 Battery charging module
- DFRobot Reed Switch (SEN0481)
- Glass fuse folder + Fuse
- Salecom slide switch (TS-13-A1-2-CR1-E-H)
- 2x 2P Screw terminal (DB126V-5.0-2P)
Enclosure:
https://www.printables.com/model/264666-mailbox-notifier-enclosure