Diode usage

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I have an automation system that I am trying to control a garage door
opener with. There is a relay on the automation controller that I'm
using to open and close the door. When I wire my controller's relay
common to one wire and NO to the other inline with that keypad it works
most of the time. Here is my problem, the garage door opener's keypad
has its own little brain, it's not just a simple contact button.
There is 12 volts sent to the keypad, and this sends my automation
controller into a hissy fit, will a diode prevent that voltage from
reaching my controller? If so what kind?

I apologize for my inexperience in this area and appreciate any
assistance!

Jon

 

[Bob]

I have an automation system that I am trying to control a garage door
opener with. There is a relay on the automation controller that I'm
using to open and close the door. When I wire my controller's relay
common to one wire and NO to the other inline with that keypad it works
most of the time. Here is my problem, the garage door opener's keypad
has its own little brain, it's not just a simple contact button.
There is 12 volts sent to the keypad, and this sends my automation
controller into a hissy fit, will a diode prevent that voltage from
reaching my controller? If so what kind?

I apologize for my inexperience in this area and appreciate any
assistance!

Jon

Are you saying that it will sometimes trigger the door with only *one* wire
attached from the relay? If so, that relay contact is not isolated with
respect to the door opener. You really need a relay that has truly isolated
contacts. Then, it should work, but you'll need to connect both leads to the
relay.

Bob

 

[ehsjr]

I have an automation system that I am trying to control a garage door
opener with. There is a relay on the automation controller that I'm
using to open and close the door. When I wire my controller's relay
common to one wire and NO to the other inline with that keypad it works
most of the time. Here is my problem, the garage door opener's keypad
has its own little brain, it's not just a simple contact button.
There is 12 volts sent to the keypad, and this sends my automation
controller into a hissy fit, will a diode prevent that voltage from
reaching my controller? If so what kind?

I apologize for my inexperience in this area and appreciate any
assistance!

Jon

I assume you need to press just one button? If so:
A diode may work for you - I suspect not. While it
could keep your controller happy, it may at teh same
time prevent it from operating the opener. Instead, use
a relay. That will work for you. Your controller operates
the relay, and is totally isolated from the opener. The
points on the relay are wired to the opener's button.

Of course, if the opener requires more than one key to
be pressed, the above won't work - you'll need one
relay for each key to be pressed, and the ability to
operate them in the correct sequence.

Ed

 

[jon]

The automation controller has its own relay, but I assume it's an
electronic version of a relay. What you are saying makes sense! I'll
put a mechanical relay behind the automation controllers relay and that
will prohibit any power from reaching the automation controller
reguardless of what the automation controller has.

Thanks guys!!

Jon