After one too many nights lying awake wondering if he had remembered to close the garage door, Bryan decided to reengineer his automatic door opener. He attached a detector switch to the opener drive rail, which is engaged by the drive shuttle as the door arrives at the fully open position. He wired the switch to a delay timer that begins its count when the switch is closed. When the timing period clocks out, the timer's normally open dry contacts signal the opener to close the door.
Hands-free Garage Door Closer Parts List
Allied Part #
Delay-on make timer relay 120V ac
Octal relay socket
Unidirectional hinge roller switch
6-32 aluminum male-female stand-offs
Conductor 120V ac power vord
Additional parts required: Delay-on make timer relay 24V dc; 24V dc power supply; crimp terminals; small lengths of two conductor wire.
Halloween isn’t just a time for creative costumes. Thanks to the element14 online design community, the holiday this year also brings us a number of creative electronic device design ideas aimed at making your Halloween party a unique experience.
On April 15, 2010, President Barack Obama gave a major speech at the Kennedy Space Center in Florida, announcing that the US would send astronauts to Mars by the mid-2030s. But in order to do so, NASA would first need to ramp up its capabilities through missions directed toward "a series of increasingly demanding targets," i.e. asteroids.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.