Crazy idea ? external power supply to door sensor

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crazy72
Posts: 1
Joined: 25 Mar 2018 21:10

Crazy idea ? external power supply to door sensor

Post by crazy72 » 25 Mar 2018 21:20

Hi

Am i crazy if I want to connect an external power supply to the fibaro door sensors ?
The idea is to use the sensor with the battery so in case the power has gone off the sensor will continue to work.
Required:
- rechargeable battery 14250
- This one to provide 220V-5V
https://www.ebay.it/itm/Alimentatore-5V ... SwwChar~v7
- It will be connected to this one to have a recharge module and not overload the battery
https://www.ebay.it/itm/Module-recharge ... Swd4tTvWKT

For less than 10 euros we have a powered z-wave door sensor with backup power supply. (extender function not available)

What do you think ?

Thanks
Chris


IgoriokLT
Posts: 87
Joined: 09 Oct 2016 15:24

Re: Crazy idea ? external power supply to door sensor

Post by IgoriokLT » 08 Apr 2018 19:56

Easier way - take Arduino Uno or even smaller, 2-core wires, 5-12V supply. Take the battery out, connect wires to the sensor and arduino`s 3.3V pins, plug power supply into a socket. You have external power supply.

I did it to my Philio 3-in-1 sensors, and it works.

michap
Posts: 332
Joined: 26 Mar 2013 10:35
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Re: Crazy idea ? external power supply to door sensor

Post by michap » 13 Apr 2018 18:59

Take any LiPo cell and add a small low dropout regulator - as sample LP 2950 ACZ3,0 for very small money.
It will need only about 3,4V on input and will protect the Z-Wave chip against high voltage of the LiPo cell.

If you have more place you can use a solar charger for LiPo cells- then it will be a solution for ever (more or less) ;)
(I use it for Z-Uno as sample)

Michael

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