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ndgcpr
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Location:
Pine Rivers QLD
Registered:
April 2005
Re: Who can help with building a temp gauge? Tue, 03 May 2005 11:50 Go to previous messageGo to previous message
OK here we go.


You can buy dual temp sensors from jaycar. the are fairly cheap too. pull it apart and there will be two sections on one end. one will have "out" written on it the other "in". these are the two senders. the "out" one will have two wires that run to the "probe". the other will most probably have a little Green thing about 1-2mm long and 1mm wide. I hope you can solder SMD.

Unsolder it and solder on some wire (the better quality the less voltage drop and thus the more accuracy) then re solder the green thing on the end. pull apart the probe and you will find much the same thing. unsolder it and solder new wires on it. put the two probes in the same place and hopefully the will read around the same temp. it all depends on how accurate you want it.


Now to start from scratch. i would use some NTC thermistor's. this will pretty much tell you how to use them: http://www.ecircuitcenter.com/Circuits/therm_ckt1/ therm_ckt1.htm

You can run a simple resistor divider as shown but it will give a exponential response. it is best to use a constant current circuit. he is a circuit diagram you should be able to run the thermistor where the LEDs are and just measure the voltage drop across it:
http://7wells.tripod.com/caving/rayovac_mod/const_ current_circuit.html

i hope this is what you were after. if you want info on running LCD's i will post another long speel if you want

[Updated on: Tue, 03 May 2005 11:52]

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SubjectPosterDate
Read Message   Who can help with building a temp gauge? clubagreenieTue, 03 May 2005 04:55
Read Message   Re: Who can help with building a temp gauge? EnFlaMEdTue, 03 May 2005 10:35
Read Message   Re: Who can help with building a temp gauge?  ndgcprTue, 03 May 2005 11:50
Read Message   Re: Who can help with building a temp gauge? ToobsWed, 04 May 2005 04:34
Read Message   Re: Who can help with building a temp gauge? clubagreenieWed, 04 May 2005 09:13
Read Message   Re: Who can help with building a temp gauge? wilbo666Wed, 04 May 2005 11:15
Read Message   Re: Who can help with building a temp gauge? Cool1Wed, 04 May 2005 10:38
Read Message   Re: Who can help with building a temp gauge? riverWed, 04 May 2005 11:27
Read Message   Re: Who can help with building a temp gauge? riverWed, 04 May 2005 11:45
Read Message   Re: Who can help with building a temp gauge? clubagreenieWed, 04 May 2005 12:46
Read Message   Re: Who can help with building a temp gauge? riverWed, 04 May 2005 22:44
Read Message   Re: Who can help with building a temp gauge? ndgcprThu, 05 May 2005 01:49
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