Discussion in "General help Guidance and Discussion" started by    Abhinav    Nov 30, 2009.
Sat Oct 02 2010, 12:29 pm

Parallel ADC needs lots of Pins of Microcontroller.

My Suggestion go to

CS5460 from Cirrus Logic..
MCP3202 from Microchip

Both Required 3 wires for interfacing with any Micro controller.


Gurpreet Singh


" A person who never make mistakes,never try new things"

 sageliu like this.
Sat Oct 02 2010, 05:00 pm
good idea Gurpreet312
serial adc's are slow but in this application it is pretty sufficient
exactly ICL7107 is a ac meter ic display value on 7-segments if u need a diagram i can provide u

[ Edited Sat Oct 02 2010, 05:01 pm ]
 sageliu like this.
Sat Oct 02 2010, 05:43 pm
see here afnan idea
see it for people discussion on ac voltmetr
and Abhinav.Chaurey now it is time to be happy for u i have found a circuit for Digital AC Voltmeter for u
it uses a digital ics but u can mange it now to display it on 7-seg or lcd
here is link for u
keep happy

[ Edited Sat Oct 02 2010, 05:51 pm ]
 Abhinav.Chaurey like this.
Tags ac voltmeterdigital ac voltmeter
Thu Aug 23 2012, 05:08 pm
Guys, it has been long since someone has posted here. But since I am doing the same project now, I need some help.
BTW, before posting the problem, can anyone tell me if it is fine to discuss about other controller like AVR/PIC?
 sageliu like this.
Thu Aug 23 2012, 09:15 pm
@ gohilurvish
yes u can discuss every thing but in proper forum
for pic generate thread in pic category
Fri Aug 24 2012, 11:03 am
Thanks majoka.
Actually I am currently making a project to measure AC voltage in range of 100s of Voltage (mostly 100-400v).
My circuit goes like this. (will upload the diagram in some time)

Power supply is a 9v Battery.
uC is ATmega8/16.

AV volt will come to a half wave diode rectifier. (for AC, P will go to diode and N will go to circuit's ground)
the output has a voltage divider (330k : 2k) which will scale it down to <2.5 v.
A Cap of 100uF parallel to 2k res.
A zener of 5v parallel to cap/2k res (just to protect uC's pin).

and the output of 2k res goes to uC's ADC.

uC uses internal 2.56v reference.

Now, as the input of ADC will keep varying, I take the ADC for around 5000 times (each will take max 200us). I pick up the max value and show it on display (3 seven seg, muxed).

Biggest issue is, the output will keep varying and move by +/- 8 volt.

I am fine if the scanned value is incorrect by some margin (5v) but cannot tolerate the varying value.

Adding more cap will slow down the rate of change and hence, change of voltage will take a few seconds to reflect.

And idea where the mistake can be?

I will upload the code as well. (would be written in BASCOM-AVR).

Any inputs are appreciated.
Fri Aug 24 2012, 11:36 am
@ gohilurvish
comment better after seeing the schematic
Sat Aug 25 2012, 01:44 am
Thread locked while gohilurvish creates a new thread in the AVR forum.

[ Edited Sat Aug 25 2012, 01:45 am ]
 sageliu like this.

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