The project goal is to ring an existing Friedland doorbell when the Ring Doorbell 4 is pressed.
To this end I used an SDR (Software Defined Radio) USB dongle to see if it could pick up bell rings on 868 MHz.
Looking at the back of the doorbell is has the Libra+ model number of : 48248SL and the fact it operates at 868Mz (the unlicensed instrumentation band in the UK/Ireland)
With the rtl_433 software installed on a Kali Linux desktop I got this result:
Using the command:
kilnageer@mint-AMILO-Pro-Series-V8210:~$ rtl_433 -v -f 868000000 -M time
Interestingly, it sees it as a Honeywell doorbell so they must share the same RF protocol!
So this allows me to know when someone has pressed the doorbell but can I mimic this action myself in software so that I can get the Ring doorbell to activate it?
So to this end I bought a Honeywell ringer and a LILYGO TTGO MCU both of which have 868MHz transmitters.
The Honeywell DCP311 doorbell push button:
uses the ActivLink protocol but isn't detected by the SDR. So I've parked that approach up for now to concentrate on the TTGO MCU. Which can apparently run sniffer firmware :)
http://www.lilygo.cn/prod_view.aspx?TypeId=50060&Id=1271&FId=t3:50060:3
So my next blog post will be on this device.
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