LED rev counter?

Printed From: the12volt.com
Forum Name: Lights, Neon, LEDs, HIDs
Forum Discription: Under Car Lighting, Strobe Lights, Fog Lights, Headlights, HIDs, DRL, Tail Lights, Brake Lights, Dashboard Lights, WigWag, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=13754
Printed Date: July 19, 2025 at 2:44 AM

Topic: LED rev counter?

Posted By: j.a.kelly
Subject: LED rev counter?
Date Posted: May 20, 2003 at 8:13 AM

Would it be possible to make a rev counter out of LEDs??

i was thinking of having a couple of green ones, to orange then red as the revs increase. My car does not have a tacho at the moment and is manual transmition. Any body any idea how to do this?? I would be grateful for detailed explanations and diagrams please, not much knowledge!! Thanx

-------------
Thanx 4 your time

Replies:

Posted By: xetmes
Date Posted: May 20, 2003 at 12:17 PM

I have thought about doing a circuit like this for some time, but never wanted to bother. If done with a microcontroller it would not be all that hard, but it would be out of reach of most people being able to build (since they would need the chip programmer). I also thought about doing it with a freq to voltage converter and some op-amps / bar graph interface ... then i say why not just buy a tach? posted_image

Posted By: hotrodelectric
Date Posted: May 23, 2003 at 11:37 AM

Yes, it is possible. There was someone here in the States
selling one for 2CV's (J.A., you know what those are!) but unless you have something odd to fit like that, I would have to second Xetmes' suggestion, and just buy a tach- both Smith's and VDO make small ones that will fit almost anywhere.

Print Page | Close Window