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Mailbox notifier with LoRa and SMS API

This project aims at providing a mailbox notifier when it s opened (presumably by the postman). It relies on LoRa technologoy where the transmitter located in the mailbox sends a LoRaWAN alert to the receiver located in the house and set a LED on. If the house has WiFi, it then push a SMS (using Twilio free SMS API) to the desired recipient to warn him that he has a mail waiting for him in the mailbox.

For a full context understanding, please visit:

https://www.youtube.com/watch?v=VwmAAkHYImQ&ab_channel=antoinekeller

Problem to solve

Hardware

When the mailbox is opened

Wiring

Transmitter: Arduino Pro Mini and SX 1276 (LoRa module)

Arduino Pro Mini SX 1276
13 SCK
12 MISO
11 MOSI
10 NSS
9 RST
2 DI00
A0 Door switch (not SX1276)

Receiver: ESP32 and SX 1276 (LoRa module)

ESP32 SX 1276
D19 MISO
D23 MOSI
D18 SCK
D5 NSS
D14 RST
D4 DI00
D13 LED (not SX1276)

SMS API

I used Twilio for my SMS API https://www.twilio.com/

Many other companies offer similar service for free.