led temp guage
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=130890
Printed Date: May 12, 2025 at 12:17 PM
Topic: led temp guage
Posted By: rasa74
Subject: led temp guage
Date Posted: March 12, 2012 at 2:34 PM
hey all
i would like to put together a set of LED's, say green, yellow, red to show the water temp in my car, basically to work off the original temp switch (NTC) thyristor. also, a set of led's to work off the fuel guage sender (variable resistor), any help would be greatly appreciated
Replies:
Posted By: oldspark
Date Posted: March 12, 2012 at 6:29 PM
Plenty of circuits or kits in webland typically using the LM3914 10-LED dot/bar driver etc (eg, another 16 LED uA device whose name escapes me).
You'll have to determine the upper and lower "range" voltages applicable.
And probably add an RC filter to the input - especially if an olde vehicle with a mechanical voltage regulator (they pulse like a flasher can, hence pulsing signals from fuel and temp senders).
And you'll hope that the sender voltage is linear - ie, proportional or reasonably similar to what the temp or level is, and hence what the gauges should indicate.
Confirm too if voltage increases with increasing level or temp. Some gauges work the opposite way.
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