https://youtu.be/aKUESTVg_8A
A simple wireless PIR motion sensor is designed and build over LoRa. the project includes 2 board with to STM32 MCUs. One of them is interfacing a PIR sensor and the other one emulates siren sound using a buzzer. Two MCUs are communicating witlessly over LoRa
GitHub Repository:
https://github.com/UsefulElectronics/stm32-rylr998-lora-transceiver
Thingiverse Profile:
https://www.thingiverse.com/wardzx/designs
MCU Used pin number saving techniques playlist:
https://www.youtube.com/watch?v=npfm74aswP8&list=PL6JRJSblHowDlqM-Fut5b1vjC62iKF4Wy