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Doorknob touch sensor

1. Circuit... ... 3. charge 4. Uncalibrate... 5. The... 6. Door knob... 7. Wired up 8. Alarm... 9. Alarm... 10. Alarm...

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Dry current
 
 

Dry current

Date: 02/16/2006 Views: 1424

Door knob touched

When the door knob is grounded, the blue trace takes longer to charge. Therefore, the yellow trace triggers the flip-flop first. When touching the knob, the trace does not drop this far. I grabbed right onto the wire. Touching the doorknob does not cause as much noise either.

Date: 04/24/2006 Owner: Matthew
Full size: 320x240
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