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deah
Joined: 16 Jul 2007
Posts: 18
Location: philippines
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 01 Aug 2007 5:11 design a temperature sensitive circuit..... |
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can anybody help me make it?!
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IanP
Joined: 05 Oct 2004
Posts: 6346
Helped: 1505
Location: West Coast
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| 01 Aug 2007 5:43 Re: design a temperature sensitive circuit..... |
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Almost anything can be used as temperature sensitive circuit: diodes, transistors (see picture below), temperature-dependant resistors etc. etc. etc.
Also, there are dedicated temperature sensors which output voltage is directly proportional to temperature, for example the LM35:
http://www.facstaff.bucknell.edu/mastascu/elessonshtml/Sensors/TempLM35.html
All that stuff can be used in the design of a temperaure sensitive circuits ..
Regards,
IanP
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deah
Joined: 16 Jul 2007
Posts: 18
Location: philippines
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| 04 Aug 2007 14:49 Re: design a temperature sensitive circuit..... |
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thank you!!!!
can you help me in making its diagram?
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the_risk_master
Joined: 12 Aug 2005
Posts: 671
Helped: 59
Location: UE+MIT, Philippines, (14°N , 120°E )
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| 04 Aug 2007 15:11 Re: design a temperature sensitive circuit..... |
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Hi deah,
I have built one, along time ago. using LM335 as sensors, and a millivolt meter as read out. It reads (scaled as) 100mV/°C. The LM555 is used as negative voltage converter (converts +9V - +12V to negative values)
Goodluck
If somethings you don't understand in my schematic, post it here or better, email me
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deah
Joined: 16 Jul 2007
Posts: 18
Location: philippines
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| 04 Aug 2007 15:19 Re: design a temperature sensitive circuit..... |
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okey,, thank you..
i'll work on this and I'll just email you on my progress..::
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the_risk_master
Joined: 12 Aug 2005
Posts: 671
Helped: 59
Location: UE+MIT, Philippines, (14°N , 120°E )
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| 04 Aug 2007 15:21 Re: design a temperature sensitive circuit..... |
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Heres my layout in PCB
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deah
Joined: 16 Jul 2007
Posts: 18
Location: philippines
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| 04 Aug 2007 15:29 Re: design a temperature sensitive circuit..... |
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actually my projects is the one thermometer sensor..
it's like, we're making a display thermometer..
that thermometer should measure the temperature of the desired area,, and everyone can see it just like a digital clock..
somebody told me to first design a temperature sensitive circuit..
you have given me the diagram of that circuit,, what will i do next?
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the_risk_master
Joined: 12 Aug 2005
Posts: 671
Helped: 59
Location: UE+MIT, Philippines, (14°N , 120°E )
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| 04 Aug 2007 15:41 Re: design a temperature sensitive circuit..... |
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| For your case, you can use DS75LV for high accuracy temperature sensor, also you may interface my design to a microcontroller circuit that can ADC and drive your LCD display (or may be, segment displays). Are you familiar in some of the microcontrollers available in our country? and familiar in LCD interfacing?
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deah
Joined: 16 Jul 2007
Posts: 18
Location: philippines
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| 04 Aug 2007 16:02 Re: design a temperature sensitive circuit..... |
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i'm sorry, but no..
Added after 32 seconds:
can you still help me on that??
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deah
Joined: 16 Jul 2007
Posts: 18
Location: philippines
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| 07 Aug 2007 9:30 Re: design a temperature sensitive circuit..... |
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do i have to make a program for my project display thermometer?
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the_risk_master
Joined: 12 Aug 2005
Posts: 671
Helped: 59
Location: UE+MIT, Philippines, (14°N , 120°E )
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| 11 Aug 2007 13:19 Re: design a temperature sensitive circuit..... |
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| yeah, of course but I can help you with that so don't worry.... by the way, you should pick a microcontroller of your choice to work on with
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