as measurement sensors to measure the distance the garage door is off the floor or tilt sensors to measure the tilt of the garage door due to simplicity the tilt sensor would be preferable the universal garage door remote is what stores all the codes to all the different garage doors this allows one product capable of working on thousands of different garage doors when the universal garage door remote is signaled the universal garage door remote transmitter sends an rf signal to the garage door opener to close the garage door an alternative to using the universal garage door remote would be to send a wireless signal to a module that would press the garage door open close button see fig2 the alarm device s are audible and or visual the purpose is to warn anyone around the garage door that the door is going to soon close most probably a flashing light and a siren or beep would be the preferable alarm method another probable alarm device is a device that calls a phone number if the garage door is open too long the additional device can be a module that plugs into a standard phone line or a separate mobile phone built into the automatic garage door closing device the control inputs switches control a turning on and off the device b programming the universal remote for a specific garage door type c changing the values of how long the garage door can be open before the alarm goes off d change how long the alarm goes off before the signal is sent to close the garage door and e to change the phone number to send a text message to warning that the garage door is open the device would also need.