My purpose for this project is to add an additional remote controller to my garage door opener without making any permanent changes to the opener. In this project I used the Visitect RF300R receiver and matching remote.
Decoding the outputs. The receiver has 2 data outputs and an enable output. The enable goes high when either button is depressed. Data 1 and Data 2 latch high depending on which button was pressed last. To allow me to add additional features later I decided to use the enable and Data 2 to control the relay to trigger the opener. To keep things simple I constructed a simple AND circuit so that both signals had to be high in order for the relay to close. This can be seen in the circuit diagram below.
The AND circuit is made up of two transistors and the output of the AND is the relay. The relay contact is wired across the existing button on the wall for the opener.
Operation is pretty simple push the 2nd button and the relay closes for the duration the button is held.
Conclusion: This unit has proven to be more reliable than the internal remote controller. This unit also has proven to have a range over 50 feet. However post 9-11 I would not even try to go through any type of security with the remote that is paired with this receiver due it’s unusual extendable antenna on the remote.