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Sensors / Detectors: Pressure

Sensors / Detectors -- Main Page


Last Updated: November 21, 2017 05:46 AM

Circuits Designed by Dave Johnson, P.E. :

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.-July, 2006

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.-July, 2005

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.-January, 1998

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.-December 26, 1998

Motion Alarm using piezo Device -  An inexpensive piezoelectric device is used as a motion sensing device for this motion alarm. . . Circuit by Dave Johnson P.E.-July, 2006

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.-July, 2006

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.-July, 2006

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.-July, 2006

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

29 Style Transmitters...What To Build? - Part 1 -  Most hams in the late 20's and early 30's seemed to be using simple transmitters...one or two tubes at the most. No doubt the poor economics of the time made it difficult to build anything really elaborate but it didn't seem to stop them from getting on the air with whatever they could put together. __ Designed by VE7SL - Steve

29 Style Transmitters...What To Build? - Part 2 -  When it comes to putting a transmitter together for the BK, there are a lot of choices!  My advice for a first-build '29 rig would be either a simple TNT or a Hartley-style oscillator. Both are easy to get operating and, when correctly optimized, are capable of putting out a nice-sounding signal. __ Designed by VE7SL - Steve

Add Programmability to Sensor Amplifier -  03/21/02  EDN Design Ideas:  The pressure-sensor amplifier circuit of Figure 1 offers a number of advantages over the traditional approach using the classic three-op-amp instrumentation amplifier.  The circuit can operate from a single supply and uses only two  __ Circuit Design by Chuck Wojslaw, Catalyst Semiconductor, Sunnyvale, CA

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.-July, 2006

Bender senses shocks -  EDN Design Ideas:  05/14/2013    With the aid of a simple mounting system and some soldered-on weights, a piezoelectric “bender” can detect mechanical shocks __ Circuit Design by Don Sherman, Maxim Integrated Products, Sunnyvale, CA

Circuits adds Programmability to Sensor Amplifier -  03/21/02 EDN Design Ideas:  The pressure-sensor amplifier circuit of Figure 1 offers a number of advantages over the traditional approach using the classic three-op-amp instrumentation amplifier.  The circuit can operate from a single supply and uses only two op amps and 1% resistors.  if the reference voltage, VREF, is 0V, the transducer gain for the circuit __ Circuit Design by Chuck Wojslaw, Catalyst Semiconductor, Sunnyvale, CA

Compensate for four-wire sensor errors -  Resistive pressure sensors that use two resistive elements and four wires are useful in pressure-monitoring applications. When the pressure rises, one resistance rises and the other falls. Accurate measurements with resistive sensors require compensation for losses due to wire resistance, especially when wire lengths are tens of meters.  __ Designed by Septimiu Pop and Ioan Ciascai, Romania

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.-July, 2005

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.-January, 1998

Hybrid vacuum tube/solid-state audio power Amplifier -  08/11/14  EDN Design Ideas:  An audio power amp design that combines vacuum tube input circuitry with solid-state output and feedback components. __ Circuit Design by Craig D. Merz

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.-January, 1998

MEMS-Based Vibration Analyzer with Frequency Response Compensation  -  By measuring acceleration in the second and third spatial dimensions, the user can write custom software allowing a more accurate and complete vibration sensing system.  , This circuit uses the EVAL-SDP-CB1Z System Demonstration Platform (SDP) evaluation board and the EVAL-CN0303-SDPZ circuit board.  The EVAL-SDP-CB1Z evaluation board is used with the CN0303 Evaluation Software to capture the data from the EVAL-CN0303-SDPZ circuit board__ Analog Devices from the Lab

Motion Alarm using piezo Device -  An inexpensive piezoelectric device is used as a motion sensing device for this motion alarm. . . Circuit by Dave Johnson P.E.-July, 2006

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.-July, 2006

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.-July, 2006

Pressure Gauge Responds Linearly to Altitude -  03/03/94 EDN Design Ideas:  You can use a common pressure transducer as an altimeter if you employ a special technique to make the transducer respond linearly.  if you were to simply amplify the output of a pressure gauge's bridge (VB in Fig 1]by a gain of 32.7 and an offset of 3.2V, such a circuit would produce an output of0V at sea level and 1V at 10, 000 ft.  However, this simple design would read 38.5 mV (385 ft], which is too high at 5000 ft.  The nonlinear relationship between atmospheric pressure and altitude causes the error, which peaks at 3.85% of full scale __ Circuit Design by Bruce C Trump, Burr-Brown Corp, Tucson, AZ

Pressure Sensor Alarm -  General purpose circuit of the simple pressure sensor alarm is built around a couple of readily available cheap components.  Working of this circuit is straight forward and self-explanatory.  When the circuit is powered by a 9V compact battery, the active piezo-sounder at the output of IC 1 starts beeping for a short time and __ Designed by Popescu Marian

Pressure Sensor-Based Altimeter -  The circuit uses an absolute pressure sensor to measure barometric pressure, it depends on the altitude but not linearly, remember this when using the circuit.  The pressure sensor can be absolute or differential, this means that the output depends on absolute pressure or on the pressure difference between two ports of the device.  it is a four terminal device: if a current flows between terminals 1 and 3 the DDP found between pins 2 and 4 is (almost) proportional to pressure (absolute or differential).  The output depends on the current and on temperature, therefore, this must compensated.  The output is very small so we need amplification.   __ Designed by Paolo Zini

Pressure-Sensitive Alarm -  Here is a low-cost, pressure-sensitive burglar alarm.  The alarm uses a home-made pressure sensor, which works as a variable capacitor using two copper-clad boards and a piece of sponge in between...__ Electronics Projects for You

Presure based hit switch -  This versatile hit switch is the electronics equivalent of a conventional switch.  it can be used to control the switching of a variety of electronic devices.  The circuit of the hit switch uses a piezoelectric diaphragm as the hit sensor.  A piezoelectric material develops electric polarization when strained by an applied stress.  The hit sensor makes use of this property.__ 

RS-232C port measures pressure -  08/01/97  EDN Design Ideas:  A simple circuit and accompanying software turn a pressure sensor into an accurate and cheap pressure digitizer that works with any PC's RS-232C COM port.  Many manufacturers make micromachined silicon piezoresistive pressure sensors __ Circuit Design by W Stephen Woodward, University of North Carolina--Chapel Hill

Seismometer & structural vibration meter -  05/14/14  EDN Design Ideas:  Use a TI LDC1000 as a sub-micron displacement sensor for vibration measurement and logging in seismic and structural mechanics applications.   __ Circuit Design by Dmitrii Loukianov

Sensitive Vibration Detector -  This vibration detector is realised using readily available, low cost components.  One of its many applications is in a rolling shutter guard for offices and shops.  The detector will sense vibration...__ Electronics Projects for You

Smart Vibration Sensor -  in this vibration sensor alarm circuit, initially, when power switch S1 is flipped to 'on' position, power indicator LED1 lights up immediately.  IC LM555 (IC 1) , wired as a simple latch circuit...__ Electronics Projects for You

Spice 3 Models Pressure Sensors -  01/01/98  EDN Design Ideas:  Commercially available versions of Spice 3, such as isSpice4 (intusoft, San Pedro, CA) , can simulate mixed-domain systems containing electrical, mechanical, physical, and mathematical elements using behavioral models.  You can use these features to simulate a variety of components.  For example, the generic subcircuit in Figure 1 and the corresponding listing model the simple linear behavior of a pressure transducer.   __ Circuit Design by Debra Horvitz, Galahad Systems, Laguna Hills, CA

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.-July, 2006

Use RS-232C port to measure pressure -  08/01/97 EDN Design Ideas:  A simple circuit and accompanying software turn a pressure sensor into an accurate and cheap pressure digitizer that works with any PC's RS-232C COM port.  Many manufacturers make micro-machined silicon piezo-resistive pressure sensors __ Circuit Design by W Stephen Woodward, University of North Carolina--Chapel Hill

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Pressure Detectors / Sensors


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