Voltage Detectors / Sensors / Monitors
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Sensors / Detectors -- Main Page
Last Updated on:
Friday, June 04, 2021 01:53 PM |
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Links to electronic circuits, electronic schematics and designs for engineers,
hobbyists, students & inventors:
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Serial Voltmeter using the PIC16C71 - Building a serial voltage
meter to measure from 0 to 5 volts DC is actually pretty easy. Using MeLabs
PicBasic, and Microsoft's Visual Basic Version 5 Pro. You need Visual Basic
Pro version because you will have to use Basic's MSComm control. This
control is not available in the Visual Basic 5 "Learning" Edition. The
PIC16C71 simplifies the task even more by having a built in A/D converter.
Pins 17,18,1,2 are the analog inputs AIN0,AIN1,AIN2,AIN3 respectively.
….(electronic schematic added 11/08) |
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Simple Circuit Detects Voltage over Ranges - 10/10/96 EDN-Design
Ideas....Sometimes, a visual indication of whether a sensed voltage is above
or below its nominal value can be useful. Most approaches to overvoltage or
undervoltage sensing use two voltage comparators and a resistor divider to
form a window comparator.... [Design Idea by Mark Stitt, Burr-Brown, Tucson,
AZ] |
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Simple Circuit Disconnects Load from Battery - 03/14/96 EDN-Design
Ideas....To prevent battery damage, the circuit in Figure 1 disconnects the load at a
predetermined level of load voltage. This load voltage, VTRIP, is closely
proportional to the battery voltage. R1 and R2 determine the level of VTRIP that
corresponds to voltage of 1.15V at pin 3 of IC1. A voltage of 1.15V at pin 3 of IC1
causes the internal comparator to trip. Thus, VTRIP=1.15(R1+R2)/R1.... [Design Idea by
Michael Keagy, Maxim Integrated Products, Sunnyvale, CA] |
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Solid-state Relay Saves Battery's Life - 09/01/94 EDN-Design Ideas....The
circuit in Fig 1 uses a low-resistance p-channel FET, Q4, to disconnect a load from
the battery when the battery's voltage drops below a certain value. After you
disconnect the circuit, it remains off until you remove and replace the battery....
[Design Idea by Tom Gay, Siemens, Regensburg, Germany] |
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Status Indicator Flags Five Discharge States - 01/20/94 EDN-Design
Ideas....The circuit actually indicates five conditions of the battery. A steady glow
assures the user that the battery is strong and healthy. A2-Hz brief flicker off
indicates that the battery is starting to show age. A more insistent,50%,5-Hz flashing
is a warning to have a spare battery on hand. A brief flicker.... [Design Idea by Glen
Chenier, Fitel Photomatrix, Nepean, ON, Canada] |
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Using the Microchip TC54 Voltage Detector - Microchip Application Note
Published 12-Nov-02 (app note added 2/06) |
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Volt Meter with Video Output - (schematic / Circuit design added 08/05)
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