Throttle position indicator circuit

[Phantom]

I have several projects that I am working or going to be working on this idea I have had for a while. What I want to do is add a bar of LEDs to show the Throttle Position Sensor (TPS) voltage as a percent. Similar to KITT from Knight Rider KNT2000's Customs and Restoration Parts :: LED Green Gas Pedal LOL. The difference is the lights would be one the dash.

Here is what I know the TPS runs from 0-5v IIRC getting percent from voltage will not be hard as I believe it is linear but can quickly check with my scanner/programmer. I would like to have an extra LED light for each increase in TP% starting at 5,10,15,20,25,50,75,100%. So at 5% 1 LED would be lit at 10% 2 would be lit.

Unfortunately it has been some time since I worked with circuits an I'm having a little trouble figuring out how to get a 0-5v reference to turn on the lights I want. That is where I need some help/guidance.

I want to go for something more simple than a Arduino hoping I can do it with a IC or logic gate. I guess the easiest way to do this would be to use a battery tester or a fuel gauge to give the reading but I would like to have it as a light bar.

Thanks for the help and I will keep everyone posted as I start working on it.

[dcb]

My $25 electric scooter had some throttle lights on it, had one chip and a couple resistors and LED. I'll dig through my clutter and see if I can get a part # off the chip.

[dcb]

I don't see it now, but it was basically a quad comparator and would light up 4 leds. You could double it up for 8, but you need a voltage divider ladder with taps for each comparitor, and led resistors and LED.

When I think about it an atmega 168 chip (the heart of an arduino) would make a slightly simpler circuit. You could drive like a 20 led display with 20 low power leds, 20 led resistors and 2 voltage divider resistors connected to an analog pin. Tie it into the tps 5v source (if it doesn't complain) and thats about it.

[dcb]

also just noticed the UAA170 chip, looks promising:
SCUMARI Technohobby

[RuHaSs]

This should do the job: Dot/Bar Display Driver