Input: variable voltage; Output: 3 LEDs switching depending on voltage.

[pixelapex]

I'm trying to assemble a circuit that will switch between 3 LEDs depending on input voltage. Electronic knowledge is very-very basic, but I'm working on it. I want 3rd LED to blink when circuit switches to it. Looks like I can accomplish with 555 timer.

So... Let's say input voltage is 0-9v
0-4v - nothing
4-6v - 1st LED
6-8v - 2nd LED
8-9v - 3rd LED blinking.

I'd like to be able to adjust points where each LED lights up (couple pots?). I want them to switch without overlap.

Is there some kind of voltage sensing relay or something like that?... Please, point in the right direction. Thank you.

 

[GreenGiant]

the way that I would do this is a few comparator circuits using op-amps, you would need a few different set voltage supplies (4V, 6V, 8V) or just an 8 with voltage dividers.
or you could use analog to digital converters and do it that way but that would be more complicated with only 3 outputs. Im talking encoders/decoders, probably a multiplexer in there, complicated.

using the comparator method would grant you a lot of fine tuning if you want/need to using pots

 

[duke37]

Look at the LM3914. This has 10 comparators and 10 outputs to measure voltage.
You could neglect the first three outputs and drive a led from 4 and 5 (use a diode from each output to stop interaction) and so on to the top. The top led could be a flashing type.

The chip has a voltage reference.

 

[pixelapex]

Originally, I looked at LM3914, will research further.

GreenGiant, thank you for your idea, researching