Here are notes how I connected passive IR sensor to Meshtastic radio. With this approach you can have totally out-of-band alarming system which will deliver alarms via MESH formed by several meshtastic radios.

You can utilize this totally stand alone or combined with Edgemap for alarm visualization on map.

You can obtain Panasonic passive IR sensor and wire it up to Meshtastic Starter Kit.

This setup allows you to use Meshtastic detection node functionality to deliver movement alerts to Edgemap via Meshtastic radios.

• My 3D printable case
• Demo video

Configuration example

meshtastic --port /dev/ttyACM0 --set detection_sensor.name "12|sensor|||"
meshtastic --port /dev/ttyACM0 --set detection_sensor.monitor_pin 34
meshtastic --port /dev/ttyACM0 --set detection_sensor.state_broadcast_secs 300
meshtastic --port /dev/ttyACM0 --set detection_sensor.minimum_broadcast_secs 5
meshtastic --port /dev/ttyACM0 --set detection_sensor.detection_triggered_high true
meshtastic --port /dev/ttyACM0 --set detection_sensor.enabled true

Few pictures how I did put together RAK-19007 based Meshtastic board and IR sensor.