battery voltage level indicator

Thread Starter

Parth Goda

Joined Jan 4, 2012
1
hey guys i am new to electronics n i hav been trying to make a voltage level indicator for these specifications
red led on when battery voltage below 3v
red led blink at 1hz when battery level 6v>x>5.6v
green led on when voltage >10v
orange led on when voltage 10.5>x>6v
i am trying without any ICs but ony using LM431

any advice appreciated
 

mcasale

Joined Jul 18, 2011
210
This sounds pretty simple - assuming you have a DC supply other than your battery - and you use some ICs in the design. Not sure why you decided on the LM431without knowing your circuit.

I recommend using something like an LM339 quad comparator. It can run off of a single supply and has an open-collector output, which might be able to drive a low-current LED directly. The offset voltage should be okay for this.

I also recommend putting some hysteresis (positive feedback) on each comparator so it does not oscillate around the switch point.

The 1Hz blinking can be done with a 555 timer chip.

If you don't understand this advice, I recommend you start Googling these topics.

Good luck!
 

praondevou

Joined Jul 9, 2011
2,942
hey guys i am new to electronics n i hav been trying to make a voltage level indicator for these specifications
red led on when battery voltage below 3v
red led blink at 1hz when battery level 6v>x>5.6v
green led on when voltage >10v
orange led on when voltage 10.5>x>6v
i am trying without any ICs but ony using LM431

any advice appreciated
Ok, the voltage comparator part can easily be done with 431s. I have however never seen an oscillator build around a 431. Don't know if this is possible. As was mentioned the oscillator part is easiest being done with a 555.
 
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