LED volt meter

[DarkImpy04]

I was wondering if you could make a LED volt meter out of this 10 segment LED bargraph from Radioshack (https://www.radioshack.com/product...._name=CTLG_011_006_001_000&product_id=276-081). I need it to show all bars at 9 volts and no bars at 6.8 volts (or 7 volts if its easier)

 

[Klaus]

Yes you can, using the LM 3914 bargraph driver. Have a look here:



have fun,
Klaus

 

[DarkImpy04]

i dont knwo a lot about electronics so can someone put up a quick sketch of what i need and how to set it to show 9 volts at full bars and 7 volts at zero bars. I would need to make this be kinda small and it would be spliced off of the positve/negative wires going to my board from the 9 volt. Also im trying to make it so it doesnt consume much power

 

[audioguru]

Leds consume power with their brightness and with the amount of time they are lit. You could reduce their power by making them dimmer, flash them momentarily or "on-demand" turned-on with a push-button. :lol:

 

[Roff]

Are you wanting to power it from the battery you are measuring (self-powered)? If so, to save power you should run the display in dot mode instead of bar mode (which you suggested).

 

[audioguru]

Yeah, Ron. 8)
In bar mode it would kill a new battery quickly but a dead battery much slower.

It is difficult to see the position of a dot in the dark. I dimmly lit each 2nd LED to show the whole range that the dot fits into. :lol:

 

[cuipin]

how to do a guage volt meter??
i doing for bike de