At work, where we care for people with mental disabilities and disorders, we use these wireless buttons to allow clients to request help during the night.

They are essentially (overpriced) simple wireless doorbells that operate at 433.92 MHz using OOK (On-Off Keying).

The receivers rely on an outlet for power, which means they cannot be carried around. This is not very practical, so we were looking for a solution that would allow help requests to be received on the professional's smartphone.

That's why I built this. I used ESPHome because it's quicker and easier to set up than developing custom firmware.

I use LoRa sx127x radio modules. I tried cheap 433Mhz receivers but the range was terrible.

How to use

• Configure secrets.yaml with Wifi credenials, API endpoint and authentication token
• Ceck/configure your GPIO pins
• Check/configure frequency, bandwith and modulation
• Adjust protocol and code length
• filter and idle parameters in remote_receiver might use some tweaking depending on your remotes.
• Run:

$ esphome run rc_switch_api_receiver.yaml