Little help please W/an Op Amp - Fuelly Forums

Click here to see important news regarding the aCar App

Thread Tools Display Modes
Old 06-18-2010, 03:28 PM   #1
Registered Member
Dr. Jerryrigger's Avatar
Join Date: Sep 2009
Posts: 196
Country: United States
Little help please W/an Op Amp

So I didn't really know the best place to post this, so I picked here.
Anyway I want to make a DFCO indication light.
I have a leads from my O2 sensor. The voltage to ground on both wires is around 5V across the two wires I get .335 or so. When driving with the DMM in my cup holder it jumps to .5V or so when it is in DFCO.
So with an op amp i was hoping wire up an LED so that it would light when the voltage jumped up. 14V*.5V vs. 14V*.335V should be a sufficiently large difference to have a LED light and not light, or dim/bright would be fine w/me.
The thing that I don't know about, is the signal wires are +5V to ground...

I don't really know what I'm doing here, but is seems possible, and maybe really easy.

If i can get this working I'll write up a little "how-to" or something.
Dr. Jerryrigger is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuelly Android App - eehokie Fuelly Web Support and Community News 2 07-14-2010 09:59 PM
BIG car Andy-Paul Transmissions and Running Gear 30 10-24-2007 02:25 PM
5W-30 (cheap) to 0W-20 (expensive) Erdrick Experiments, Modifications and DIY 17 07-16-2007 05:42 AM
HCH II new person bear15 Introduce Yourself - New member Welcome 14 11-10-2006 03:39 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -8. The time now is 03:02 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.