29 Sep '15, 2am

Raspberry Pi Opens Doors

Raspberry Pi Opens Doors

The Raspberry Pi is a cheap credit card sized computer that has opened the doors of embedded Linux to millions of people. But in this case, it’s literally opening a door . The Computer Club at Western Michigan University had to move to a different room which brought with it a new challenge. The door handle was more difficult to turn than the old one. Nothing that a NEMA 17 stepper couldn’t handle, however. After printing a few gears and wiring up an Easy Driver board between the Raspi and stepper motor, they had the basics of a door opener in place. A 5v relay is used to keep the power off the stepper when not in use, and a limit switch is used to monitor the position of the door handle while a Hall Effect sensor tells when the door is open and shut. Be sure to check out the project as all source, parts list and schematics are available in case you have a simliar door that...

Full article: http://hackaday.com/2015/09/28/raspberry-pi-opens-doors/

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