oil temp triggered relay
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=133505
Printed Date: May 15, 2025 at 8:30 AM
Topic: oil temp triggered relay
Posted By: d6-karl
Subject: oil temp triggered relay
Date Posted: February 03, 2013 at 9:10 AM
first of im not sure which forum to post this into so this seems most likely but please move it if needed :)
i want to install an oil temp gauge into my car and have a relay triggered when the oil is upto running temp
my understanding of the temp gauge is that it is triggered by an increasing or deceasing resistance from the sender.
any info on what i could use to measure this resistance and then trigger a relay ?
thanks allot guys
Karl
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D6-In Car Solutions
Replies:
Posted By: oldspark
Date Posted: February 03, 2013 at 5:57 PM
A voltage sensing relay. IE - a circuit that switches at a certain voltage.
There are many such circuits using comparators (LM3900 etc) or op-amps.
You may need to consider input filtering (an RC circuit, ie, a small cap across the (comparator/op-amp's) input, and maybe hysteresis though that may be unnecessary.
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