2bit Battery Level Indicator

[dragonslayer]

spanish battery level indicator

Hi All,

Would like to design a battery level detector which will output a 2bit IO to a MCU at 4 different levels.

Have seen some Voltage supervisors but they dun seem to be the ones i need,
Anyone has any experience in doing them ?

rgrds

DS

 

[IanP]

How about using comparators to "digitalize" battery voltage ..
For exampe, the LM3900 has four of them in one body .. see picture below ..
Question is, do you need to convert 4-lines to 2-bits, or has your MCU enough available inputs to take 4 signals - up to you ..

Regards,
IanP

 

[dragonslayer]

thanks ianp but it still does not output a 2 bit signal to the MCU,

am stuck at the same issue here.

Just to clarify, i can also use 2 wires to send the individual bits to the MCU

rgrds

DS

 

[IanP]

You can add 1x7400 (4xNAND) and convert 4 outputs from 4 comparators to 2-bits .. see picture below .. or you can forget about all this stuff and employ one 8-pin PICAXE-8 microcontroller, which has 10-bit A/D and some general purpose I/O, and (first) perform A/D conversion and (second) translate result to 2-bit output ..
Mate, there are millions of ways of doing this .. just use your imagination !!!

Regards,
PanP

 

[dragonslayer]

thanks mate,

I cant use an MCU , which woul dhave been the easiest choice as the current consumption would be much more as compared to the the comparators and the Nand gates.

Will try them out

Thanks

DS

 

[dragonslayer]

from the above diagram,

How does one choose the resistor values for the comparators to detect the voltages accurately?

Any ideas?

Thanks

 

[suru]

IC BASED LEVEL INDIACTOR CAN BE MADE. SEARCH SOUND LEVEL INDICATOR ON NET.