Car Battery Monitor using LM3914

[pieman54]

Hi there....Just wanting to know if the circuit below can be modified to read/display the voltages in reverse order. ie. at one end of the scale led_1 turns on at 11.6 to 12V and led_10 turns on at8 to 8.4V????? Is it possible to reverse the output to do this. How would I do that????

https://www.electronics-lab.com/projects/automotive/009/index.html

 

[IanP]

Here is one crazy idea:

try to connect R(LO) to V(Ref-out) and R(HI) through 1kΩ to 0V
and see how it goes ..

Rgds,
IanP

 

[pranam77]

Hi there....Just wanting to know if the circuit below can be modified to read/display the voltages in reverse order. ie. at one end of the scale led_1 turns on at 11.6 to 12V and led_10 turns on at8 to 8.4V????? Is it possible to reverse the output to do this. How would I do that????
https://www.electronics-lab.com/projects/automotive/009/index.html

Put the LM3914 in bargraph mode, Connect all the outputs of the LM3914 to a Hex Inverter gate like CD4069 and then connect LED's to its outputs which will glow the last LED when the top voltage is connected and the Bargraph will move left side as to indicate full scale for the lowest volatge set by the circuit. Cheers

 

[pieman54]

Here is one crazy idea:

try to connect R(LO) to V(Ref-out) and R(HI) through 1kΩ to 0V
and see how it goes ..

Rgds,
IanP

Thanks Ian...Tried that and unfortunately didn't work

Added after 4 minutes:

Hi there....Just wanting to know if the circuit below can be modified to read/display the voltages in reverse order. ie. at one end of the scale led_1 turns on at 11.6 to 12V and led_10 turns on at8 to 8.4V????? Is it possible to reverse the output to do this. How would I do that????
https://www.electronics-lab.com/projects/automotive/009/index.html

Put the LM3914 in bargraph mode, Connect all the outputs of the LM3914 to a Hex Inverter gate like CD4069 and then connect LED's to its outputs which will glow the last LED when the top voltage is connected and the Bargraph will move left side as to indicate full scale for the lowest volatge set by the circuit. Cheers

I checked out these CD4069 and must admit I'm a bit lacking when it comes to electronics. Can you describe how to connect this into the current circuit please???? Or even a quick sketch of what goes where???? Many thanks for your comments so far.

cheers

 

[pranam77]

Here is your application schematic. Hope it helps you. Cheers

 

[pieman54]

Here is your application schematic. Hope it helps you. Cheers

oh mate thankyou. I think I can understand this one!!!! I'll have a go in a few days and let you know how it went....Thankyou once again