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IRM software settings and description.
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IRMeasure demo version.
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Voltmeter
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Using PIC12F629 and his A/D converter for
analog voltmeter.
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Voltmeter is a part of modular system IRMeasure.
Overview
Here is a simple project with PIC 12F675. This voltmeter will work from 0V up to 50V (the
resolution is set to 0,05V). This voltmeter use PIC12F675 with A/D converter (resolution of A/D
conversion is 10 bit). I don't think you need better performance than that for simple
measurement. |
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Voltmeter - feature list
- range: 0-50 V
- input impedance >10 M ohm
- resolution 0,05 V in entire range
- powered by 9V batery ( 8 mA/9V )
- very small dimensions: 33 x 42 mm
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Imput part
The PIC's analog inputs accept voltages from 0V to +5 V.Therefore a TLC271 with a voltage divider
is placed before PIC to increase the input resistance and range of the voltmeter.
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The source
impedance at the PIC's analog input ports is 2.5 kOhms. More about this can be found in the PIC's
datasheet. To power supply is a used 9V battery.
Voltmeter schematic
A LM336 is used as a reference voltage source. This is a precision 2.5-V shunt
regulator diodes with low-temperature-coefficient.It is put in a T092-package and you may replace
it by another one. The LM336 - series is useful as precision 2.5-V low-voltage references for
digital voltmeters, power supplies, or operational-amplifier circuitry. The 2.5V voltage
reference makes it convenient to obtain a stable reference from 5V supplies.
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Measurement is the same as with another voltmeter. Simply connect voltmeter to measuring device and you see the value of voltage
online. You can use
15 voltmeter at the same time ( or 15 other units ). The IRMeasure allows
it.
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Voltmeter - complette unit. Dimensions 33 x 42 mm.
To display data on your monitor you need IRMeasure software.
If you has a question , please contact us: e-mail.
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