I connected my traditional wired AC powered doorbell to my Konnect system through a circuit that creates a 3.3V DC signal.  I will attach a picture of my circuit and setup.  Right now I only have the front door doorbell connected. 

My question has to do with selecting the best type of zone sensor for a doorbell.  Right now I am using the open/close switch but I am wondering if anyone has a better solution.  I would prefer to have an icon that is similar to the smoke detector, one which is not colored until the button is pressed.  If anyone has any advice please let me know.  I am brand new to using SmartThings.  I created an automation that pushes a notification and text to alert me that someone is at the front door.  

I am also going to implement my mailbox soon.  I installed a proximity sensor which uses a Hall effect sensor and a magnet.  The sensor is hard wired and I buried the wire from the mailbox to my house.  

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  • Here are a few pictures of my mailbox sensor.  

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  • Opps, I just noticed a mistake in my circuit drawing.  Here is the correct depiction.  The circuit connects between the switch and the transformer, not to both switches.  


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  • Based on the second schematic you are grounding the Front doorbell F signal. I follow the pink line from the chime F and as I move to the right, below the line is a ground icon.
  • Wow this is a great idea. Can you explain to me why you can’t take the two wires emerging from the doorbell and connect it as a door sensor whose default state is open? When the button is pressed it would close the circuit and be the equivalent of a door close sensor that doesn’t require any power at all.
  • If you connect your wired doorbell to your Konnected board like you would a door contact sensor you will damage it.  A wired doorbell is an AC circuit running somewhere between 14 to 36 volts.  In order to utilize this with your Konnected board you will need a circuit that converts the AC circuit into a 3.3 volt DC circuit.  The circuit I show above works but its not the only way and I would suggest looking into a circuit that isolates your Konnected board from the AC circuit all together.  An opto-isolator circuit would be a better choice.  In the future I might replace this circuit with one of those designs.   

    I did not design the circuit above but I built it and it works.  The circuit works by rectifying the AC signal into a half-wave DC signal.  The signal then goes through a smoothing capacitor and a voltage divider to drop the voltage.  This low level signal then drives a transistor which is acting as a switch connected to the Konnected board.  

    I am not an electrical engineer and I make no claim to the safety of this circuit.  I am sure certain conditions could damage your board but it works well for me.  Perhaps someone else wants to chime in with a safer or better design.  I am sure their are many ways you could do this.     

  • I'm a newbie here and I was also interested in hooking up my wired door bell.  Would a 24VAC relay work?  Simply when the doorbell is pressed it would apply power to the relay and the relay would in turn open or close a set of contacts?

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