Re: IR Temperature Sensor

On Mar 3, 8:11 pm, tran...@xxxxxxxxx wrote:
On Mar 1, 2:14 pm, John Fields <jfie...@xxxxxxxxxxxxxxxxxxxxx> wrote:





On Sun, 1 Mar 2009 13:44:43 -0800 (PST), tran...@xxxxxxxxx wrote:
I am attempting to construct a temperature sensor that will activate
several relays when the thermometer senses temperatures above 150
degrees Celsius, or ignition point for decayed wood. Unfortunately I
have only been able to find this plan online, which has far more
features than I need.

http://www.electronics-lab.com/projects/test/023/index.html

If anyone knows of a circuit diagram that would be more to my needs or
has suggestions of any sort, I would be extremely grateful. If you
have any questions feel free to email me at tran...@xxxxxxxxxx

---
What do you mean by "IR temperature sensor"?

JF  

By IR sensor I mean like the kind you can find in a computer mouse or
motion detector, that can detect infrared energy (heat) and change the
resistance based on this (I think that is how they work, anyway). I am
trying to build a circuit where once the sensor is giving the correct
signal back, a relay will be tripped, activating another circuit I am
building.- Hide quoted text -

- Show quoted text -

Google had a number of hits for me using "temperature activated relay
circuit". This page has a simple circuit.

http://www.cornerstonerobotics.org/curriculum/lessons_year1/ER%20Week18,%20Relays.pdf

A computer mouse is not doing ir. And I think most house alarms do
motion, not ir either. Is what you mean to say that you need to be
able to point it at the heat source rather than have the sensor on the
heat source? Like these?

http://us.fluke.com/usen/products/Fluke+62.htm?catalog_name=FlukeUnitedStates&category=THE(FlukeProducts)

If so that will take a more complex circuit.
.

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