After almost frying my Pi with my last question, I thought I'd better ask if what I have seemingly working is ok and won't cause me any problems.
I have a modern wireless doorbell that I am powering from the pi by using the 3.3v pin to the positive on the chime and the negative of the chime to a ground pin on the Pi. So far so good?
Then to sense when the doorbell has been activated I'm taking an input from the positive side of an LED that lights when the doorbell is ringing to pin 25 of the Pi. That seems to register around 2v.
It consistently recognises when the doorbell is activated, and so seems to be ok, but I just wanted to check I wasn't doing anything that would harm the Pi or catch fire!
Many thanks for any assistance. Once again, apologies for any incorrect terminology.