Hacking up a Ring type camera doorbell

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Hacking up a Ring type camera doorbell

Postby jonsmirl » December 2nd, 2016, 12:20 pm

You can get cheap wifi video camera on ebay, $20
http://www.ebay.com/itm/Wireless-WIFI-H ... 2169728634
This camera needs 5V input.

Existing wiring for American doorbells has a 12V AC transformer in series to a switch and then the doorbell. It is also allowable to leak several watts (for a lighted doorbell button) without making the chime ring.

So what kind of circuit is needed to:
1) make 5V from the several watts you can draw without triggering the chime
2) provide a way to close the circuit (TRIAC?) so that chime can have full current and sound
3) Keep making 5V for the camera while chime is sounding (pulse the TRAIC?)

Can this be hacked together with something like a 555 and a TRIAC so that the camera always gets 5V and then has a GPIO to sound the chime?
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Re: Hacking up a Ring type camera doorbell

Postby k-ww » December 2nd, 2016, 12:46 pm

The camera runs on DC, and the doorbell can also, so put the camera [power supply], the button and the bell in a series loop with the bell transformer.

Call one half cycle of the power "A" and the other half cycle "B".

Place a diode across the button that short it during the "A" half cycle.

Place a diode across the doorbell that shorts it during the same "A" half cycle.

Across the Camera power supply, you need two diodes : one to short across it during the "B" half cycle,
and one that lets the camera power supply get power during the "A" half cycle.

The camera power supply gets power during the "A" phase because the button and the bell are bypassed.

[Use a a big cap before the +5V regulator for the camera, since it's running on a half phase power input]

The bell does not ring, because it only gets power during the "B" phase, and the circuit during that phase is incomplete because the button blocks it.

When the button is pushed, during the "B" half cycle, the bell gets "B" phase power, because the button now passes it and the Camera power supply is bypassed.

To make the bell louder, place a diode that passes "B" phase power in series with the bell, and place a cap [observing polarity] across the bell also.

P.M. me if you need a circuit diagram to wire this.

Use diodes with a 50V or better breakdown rating and that can handle at least an Amp.

The 5V power supply can be made with a 7805 regulator and some caps.
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Re: Hacking up a Ring type camera doorbell

Postby jonsmirl » December 3rd, 2016, 7:48 am

Can all types of chimes work on DC? What about something like this?
http://s.hswstatic.com/gif/doorbell-ch.jpg

The AC waveform will be distorted for the chime, I wonder if electromechanical type chimes will still sound ok.
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Re: Hacking up a Ring type camera doorbell

Postby k-ww » December 3rd, 2016, 5:39 pm

Ah, yes, a doorbell from the days of my youth.

If you remove the cover, you should be able to see if there is some sort of interrupter connected to the arm that hits the bell.

That will tell you that the bell can operate on DC.

An other way is just to connect the bell to a car battery.

If the bell rings, it can run on DC.

If it just goes clank once, it can't.
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