A solution for doorbells you can't hear?
Im an engineer working on a DIY project that solves a common problem: doorbells you can't hear.
It's a wireless doorbell which gives you the option to send a photo of who is at the door directly to your phone. The wireless doorbell has 3 modes: chime mode only, photo mode only, and chime/photo mode.
I'd appreciate it if anyone has opinions/suggestions for my "photo" doorbell project because I want this to be the best project I can make.
". . . doorbells you can't hear"
A relay with a high impedance coil controlling a much larger 120v doorbell?
Relays have "current gain" so find one that has a high ratio of
contact current rating/coil current rating.
"The NFPA 72 requirement for sleeping rooms is either a minimum of 75 dBA or 15 dB over the average ambient sound level, whichever is greater."
is probably for 1 meter distance. You lose 6 dB for each doubling of distance.
"Near total silence - 0 dB
A whisper - 15 dB
Normal conversation - 60 dB
A lawnmower - 90 dB
A car horn - 110 dB
A rock concert or a jet engine - 120 dB
A gunshot or firecracker - 140 dB"
and an airbag comes in at 175 dB and probably deafens you while it saves your life.
Add a key pad so the person at the door can enter his or her ph # so the homeowner could call him right away and tell him to go away or ??
". . .that solves a common problem: doorbells you can't hear. "
The relay can also control a flashing light.
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