Connect doorbell

[RayAmsterdam]

I want to connect my doorbell to de gpio (in) of my pi 3b. The momentary contact is connected in between the door entry unit (Golmar Platea) en mass. When the contact is open, the tension measured over the contact is 16,7V. What is the easiest way to get the signal of the doorbell as input?

door bell.png (1.55 KiB) Viewed 5831 times

[YellowSky]

A voltage divider to get about 3V?

[NStafford]

I am trying to do something similar with my door system. But I am pretty new to trying to do this set ups without someone checking up on my work.

For me, I am having issues other than the signal. But I would try the voltage divider.

[heggink]

Is the 17.6v ac or dc? If dc then you should be able to use a simple up/down converter to 3.3v and connect that to the gpio pin, right? I ordered these for a different use (esp power) : DD0603SB_3V3 * 5 5 STKS Auto Step-UP
http://s.aliexpress.com/NJZjiAvA

[RayAmsterdam]

Thanks for the replies. I ordered a step down converter. I'll keep you guys informed.

[RayAmsterdam]

Unfortunately the step down converter is not the solution. The step down converter itself triggers the door entry system, like if the doorbell button is pushed. Any other solution?

[RayAmsterdam]

I was thinking, isn't it simply possible to achieve this with just 2 diodes?

door bell.png (3.06 KiB) Viewed 5697 times

[RayAmsterdam]

This is the working solution:

door bell.png (2.8 KiB) Viewed 5676 times

[ronh123]

Where can I find the instructions and a diagram how to configure and connect a simple switch ( like a door bell switch without any power ) to a Raspberry PI3 and make it usefull in Domoticz.
Installation WiringPI, how to configure the pins and how to keep it in the config of the Raspberry.
Thanks

[elgringo]

viewtopic.php?f=65&t=17759&p=136511#p136511 ?

Input voltage is 8 VAC (normal doorbell), if different the resistor of 1200 Ohm must be changed