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You just use the other contacts on a relay In the normal state the voltage from the transformer keeps a relay energised and the alarm look is closed circuit, when you press the bell push the voltage across the bell drops to zero, so the relay loses power and the contacts cycle and voila, you...

It amazes me how many people seem to struggle with this problem I have been installing "video doorbells" since several years before video doorbells were on the market. All you do is get a standard POE IP camera that has an alarm input, and if you want audio then audio in/out too Add a little...

One of the most annoying things about batteries or a UPS is that they only tell you the maximum capacity of the batteries They will reach a cut off voltage where the conversion circuit ceases to try and achieve the output voltage but the batteries still have X amount of "capacity" left in them...