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Microcontroller Interface for AC Monitoring  PIC the value

Barnaby Brown Written by Barnaby Brown     September 01, 2009     Hits: 565     Favorites0 Add to favorites
 
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The circuit of Fig.2 was designed in order to interface a PIC microcontroller to a standard clip-on DVM (digital voltmeter) current probe. The PIC device chosen must have an  analogue input and the software depends on the application used. The circuit utilizes  low-noise LMC6084 operational amplifiers (IC1a and IC1b) as a precision rectifier and a  filter (IC1c) with pre-settable gain to give a response to the average current.


The circuit of Fig.2 was designed in order to interface a PIC microcontroller to a standard clip-on DVM (digital voltmeter) current probe. The PIC device chosen must have an  analogue input and the software depends on the application used. The circuit utilizes  low-noise LMC6084 operational amplifiers (IC1a and IC1b) as a precision rectifier and a  filter (IC1c) with pre-settable gain to give a response to the average current.

The interface circuit requires a low impedance current probe providing 1mV per ampere  to be connected to the input. The accuracy of the circuit is about as good as the 8-bit  ADC used within the microcontroller when one per cent resistors are employed.

Article reproduced by permission of Wimborne Publishing. www.epemag.com

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