433mhz-to-lora-forwarder: A C++ repository from daniel-mcdonough

Forward 433MHz 1527 encoded codes over LoRa.

This code listens for 1527 encoded codes from things like door sensors and smoke detectors and forwards it over LoRa to a receiver which beeps depending on the device code received.

This is part of a home security project.

If you're using 433MHz door/window/smoke detector sensors and want to receive them over a long distance, you can forward them via LoRa

Materials:

Boards:
- Controllers: Adafruit Feather RF96 M0
  - This can be swapped for an ESP board with an RF96 chip but the pin numbers may differ. This ARM chip doesn't have as large of a library compared to the ESP boards.
  - Antenna: 8.2cm length of wire
- 433MHz: RXB6 Receiver
  - Antenna: 17.32cm length of wire
  - Other receivers have terrible sensitivity or are packet-based. Do not use them.
Sensors:
- Generic 433MHz sensor supporting 1527
- Generic reed switch(optional)
Cases(3D printed):
- Found on Thingiverse.
Buzzer
- Any 3.3v buzzer large enough to hear across the house.

Use this RBX6 board.

Wiring

The default wiring is as shown. The optional reed switches are internal pullup but external resistors can be used instead. The 443MHz antenna length is ~17.32cm. The 912MHz antenna length is ~8.2cm.

Flashing

I used the Arduino IDE with the RCSwitch, SPI, and RadioHead libraries. They can be found in the Library Manager.

The Adafruit Feather M0 needs a board repository added: https://adafruit.github.io/arduino-board-index/package_adafruit_index.json This option can be found in the preferences menu under Additional Boards Manager URLs.

Flashing is standard fare. No special settings needed. You will get a warning that the RC-Switch library may not be compatible if using the M0 board. Ignore it.

Troubleshooting

Check the serial output from the forwarder in the serial monitor to make sure it's receiving, processing, and forwarding the codes.
Make sure the antennas are fairly straight and in the same orientation.
Activate the sensor from a closer distance(~2 feet).
Distance the boards from one another.
Make sure your sensors use 1527 encoding.

Potential Additions