PULSE Out for Chamberlain/Liftmaster Security Sensor emulation

Hi,

I'm trying to emulate the function of the security sensors for a liftmaster/chamberlain garage door opener. What I've learned so far is that the OEM sensors submit a 1/2 ms pulse every 6ms. Sounds easy so far.

Now since I'm relatively new to the entire electronics business, I'd like to ask this awesome community how one could go about emulating this. I understand the blink demo mostly (resistors reduce the voltage, right?).

I'd like to be able to pulse the actual input signal, coming in via VIN and going out via GND. Isn't there a way that I could achieve that using a PWN pin?

thanks a lot for your help

cheers
Ronny

ronnyfx,

What are the "security sensors" used for?

-fab