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Phase Locked Loop Integrated Circuit, Scott Buchanan, Jonathan Bonello
Phase Locked Loop Integrated Circuit, Scott Buchanan, Jonathan Bonello
Electrical Engineering
No abstract provided.
Chipper: Capacitive Bed Occupancy Sensing For An Intelligent Alarm Clock, David Levi
Chipper: Capacitive Bed Occupancy Sensing For An Intelligent Alarm Clock, David Levi
Electrical Engineering
What if your alarm clock knew when you got out—and stayed out—of bed? Current alarm clocks happily let you go back to bed after turning them off. In this project, I build an alarm which only stops ringing when you get out bed, and starts ringing again if you lie back in bed.
This project uses capacitance to detect bed occupancy. A person on or near the bed creates a tiny, picofarads level increase in capacitance, as seen by a sensor placed under the mattress. A microprocessor interprets this signal, and also drives an audio alarm. Shielding of the sensor …