Bypass Garage Door Sensor using 555 timer

This video shows hot to bypass the garage door using a 555 timer for test your garage door opener without using the sensor. You we need the following items that I purchased from MPJA.com but they are also available from ebay. 31070 MI -- Pulse Generator Board, Adjustable -- $5.95 21670 DI -- 1N4148 Logic Diode -- $0.06 (diode is not critical and almost any diode will work) Disclaim: This video is instructional video of 555 timer application only. By watching this video you agree that I not responsible for any damage or others bad events.