Hi @John74406
According to the doorbell documentation, the transmitter/receiver will work up to 50 meters in open air.
I haven’t actually tested the limit of it’s range yet, but I have now successfully extracted the receiver from the doorbell speaker circuit (it will NEVER work as a doorbell again, I had to be a little harsh on the board to get the receiver out).
There are other models of doorbell available at Bunnings which offer greater range, but I can’t confirm if they can be hacked like the HPM D642/01 can.
Here’s a picture of the Raspberry Pi working with the receiver unit alone… I simply used the Pis 3.3Volt GPIO pin to power the receiver:-
