# digital multimeter project

1. ## digital multimeter project

pls help to make the multimeter for my project

2. ## Re: digital multimeter project

may be you can find at this link :
Build a DMM or Digital Multi Meter - delabs

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3. ## Re: digital multimeter project

Originally Posted by nirsan
pls help to make the multimeter for my project
Step one for making a multimeter is to build a volt meter. The volt meter circuit is central to all other multimeter functions.

Find a semiconductor and display to only measure voltage. If trying to make a better resolution meter or learn what a meter really does, then do same with an A/D (analogu to digital) converter of at least 12 bits. Your converter will convert an incoming voltage to digital bits representing that voltage. Also learn how an A/D voltage reports different input voltages by using a resistor divider for each voltage scale.

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4. ## Re: digital multimeter project

i checked ur link but i couldn't find the ICL7106.....
wht to do.....?

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5. ## Re: digital multimeter project

Originally Posted by nirsan
i checked ur link but i couldn't find the ICL7106.....
I entered ICL7106 into Google. Got too many datasheets and other discussions. ICL7106 was simply one of so many such such solutions. ICL7106 was also one of the more famous.

In the meantime, you are also learning about Norton and Thevenin equivalent circuits because you asked to build more than just a DC volt meter. Also learn about voltage dividers. If I have not yet said it enough, the number 1 reason why we build things and fix things is to learn. Posted here are things that most any computer literate layman has in his toolbox of knowledge. What you are doing is what an informed computer tech has also done. Learn introductory concepts. And learn how to quickly get knowledge from datasheets.

Your multimeter project, even if you only get it to become a volt meter, is a perfect example of what any technically informed layman should attempt.

---------- Post added at 00:13 ---------- Previous post was at 00:04 ----------

IC ADC 3.5 DIGIT LCD 40-DIP - ICL7106CPL

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6. ## Re: digital multimeter project

better go for micro controller design, old multi-meters used 7106 but now all are using multimeter and the parts count and the input switches can be reduce, 7106 is good for 3.5digit volt meter but for multimeter you have to add more circuits to it,

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7. ## Re: digital multimeter project

I'm not a specialist in electronics, but you can add your reference at Electronic Circuits Projects Diagrams Free
or http://www.electro-tech-online.com/....-datasheet.pdf

8. ## Re: digital multimeter project

ICL7106 is common chip available in most electronic shops in major cities

9. ## Re: digital multimeter project

Originally Posted by rajudp
better go for micro controller design, old multi-meters used 7106 but now all are using multimeter and the parts count and the input switches can be reduce, 7106 is good for 3.5digit volt meter but for multimeter you have to add more circuits to it,
yes ,
now i planned to do that with pic16f877a
can u help me .....i need ur help..

---------- Post added at 09:46 ---------- Previous post was at 08:52 ----------

pls help i am searching for block diagram of the multimeter....
anybody send it to me.......
my email id nirsan7@gmail.com

10. ## Re: digital multimeter project

are you planing for auto-range or manual select type?

11. ## Re: digital multimeter project

i try manual selector...... if u hv any idea abt auto range.....

12. ## Re: digital multimeter project

Nirsan,

I think we are doing same project. I think auto range is easier than manual range. because it is difficult to make range switch(with more selections).

13. ## Re: digital multimeter project

Is it possible to interface ICL7106 to 17"LCD display??

14. ## Re: digital multimeter project

It's quite easy you can make one of your own. No need to search for completed projects. I f you want I can help you. I have made it with 89c51

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15. ## Re: digital multimeter project

Thats nice ajish, i need your help

regards
pravin

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