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Last Updated on: Thursday, April 07, 2016 02:04 PM

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Pressure Sensor / Detectors

Alarm-Piezo Device detects Motion  -  Using a piezo device, this circuit will activate a beeper whenever the circuit is moved.  It could be used as an earthquake alarm . . . [Circuit by Dave Johnson P.E.,  07/09/06]


Earthquake Alarm Circuit  -  Geophones are dandy motion sensors.  They are metal cans containing a powerful magnet, suspended with springs inside a coil of wire.  The magnet functions as a floating mass.  The slightest vertical motion of the device causes the coil to move relative to . . . [Hobby Circuit designed by David A. Johnson P.E.,  07/08/05]

Hour Meter triggered by Machine Vibration  -  This hobby circuit allows an off-the-shelf battery powered digital hour meter to be turned on and off, according to a machine's operation, without requiring a direct electrical connection to the machine . . . [Hobby Circuit designed by David Johnson P.E.,  01/01/98]


Machine Vibration Triggers Hour Meter  -  This circuit allows an off-the-shelf battery powered digital hour meter to be turned on and off, according to a machine's operation, without requiring a direct electrical connection to the machine. Machine vibrations are detected by an off-the-shelf piezo . . . [Circuit by David Johnson P.E.,  01/01/98]


Motion Alarm Using piezo Device  -  Using a piezo device, this circuit will activate a beeper whenever the circuit is moved.  It could be used as an earthquake alarm . . . [Circuit by Dave Johnson P.E.,  07/09/06]


Piezoelectric Device used for Motion Alarm  -  An inexpensive piezo wafer is used to detect vibration and when the vibration is sufficient a switch is activated . . . [Hobby Circuit designed by David Johnson P.E.,  07/09/06]


Piezoelectric Vibration Sensor Activates Switch  -  An inexpensive piezo device is used as a motion sensing device for this motion alarm . . . [Circuit by Dave Johnson P.E.,  07/09/06]


Switch activated by Piezo Vibration  -  An inexpensive piezo wafer is used to detect vibration and when the vibration is sufficient a switch is activated . . . [Hobby Circuit designed by David Johnson P.E.,  07/09/06]

 

Pressure Sensor / Detectors

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