Voltage display project.

[elfvenlord]

Hi

I have a project in mind that I want to build,but Im not too sure if it can be done without a micro-controller.
What im looking for is a circuit that measures the battery voltage and displays it on two 7 segment LED displays.Im guessing I would need two decade counters,a 7 segment LED decoder and maybe an analog to digital converter(I think).
Does anyone know of a schematic,or have any ideas?
(It would be great if It didn't include a PIC or micro-controller cause I havn't got that far yet)
Thanks for all your help.

 

[Johnson777717]

Howdy Elvenlord. You can do this with a anolog to digital converter such as an ICL7107 or NJU9202.

See this link for an example:
https://www.electronics-lab.com/projects/test/014/index.html

Also, through my experience with creating a voltmeter, it is often cheaper to purchase a panel meter for around $12 US which commonly already contain the necessary circuitry (ADC and selectable range). I've priced the ICL7107 and the NJU9202 IC's to around $9 to $12 US...then you add on the discrete components and a PCB and your cost will often be greater than purchasing a panel meter. Plus, a panel meter is often smaller and easier to fit to a chassis or enclosure. BUT, if you're looking to learn how this all works, than creating the circuitry yourself would be a good experience.

Here is an example of the panel meter that I'm referencing:
**broken link removed**

Please keep in mind, whether you go with a panel meter, or designing a circuit yourself, the ADC cannot measure it's own power supply, thus, you'll need a seperate power supply for the meter circuit additional to the power supply that is under test.

Let me know if you have any other questions. Good luck!

 

[elfvenlord]

Hiya Johnson.
Thanks so much for your reply.The links you gave me are perfect for what I need.I think I will build it using the ICL7107 since its a bit of solder practice as well (much needed).
I would love to know how it basically works.Is the ICL7107 already programed or made especially for measuring voltage or can it be used in other circuits?

 

[Exo]

The 710X are analog to digital converters with display output.
It doesn't run any software, it's just a hardware A2D put into a chip, together with some logic that can display the output to a display directly.

basically, you can only use it to do an A2D conversion and put it on a display

 

[elfvenlord]

Ok thanks

 

[alikfaster]

Howdy Elvenlord. You can do this with a anolog to digital converter such as an ICL7107 or NJU9202.

See this link for an example:
Led display digital Voltmeter

Also, through my experience with creating a voltmeter, it is often cheaper to purchase a panel meter for around $12 US which commonly already contain the necessary circuitry (ADC and selectable range). I've priced the ICL7107 and the NJU9202 IC's to around $9 to $12 US...then you add on the discrete components and a PCB and your cost will often be greater than purchasing a panel meter. Plus, a panel meter is often smaller and easier to fit to a chassis or enclosure. BUT, if you're looking to learn how this all works, than creating the circuitry yourself would be a good experience.

Here is an example of the panel meter that I'm referencing:
**broken link removed**

Please keep in mind, whether you go with a panel meter, or designing a circuit yourself, the ADC cannot measure it's own power supply, thus, you'll need a seperate power supply for the meter circuit additional to the power supply that is under test.

Let me know if you have any other questions. Good luck!

thaNKS FOR LİNK