Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Temperature to voltage sensor

Status
Not open for further replies.
I

iscore

Junior Member level 1
Joined
Jul 22, 2012
Messages
15
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,402
Hi all,
I need a temperature to voltage sensor to convert body heat to voltage. But the sensors I came across require 3 to 5V input voltage supply. And the temperature to converted voltage is of millivolt range. So isn't it a waste of energy that supplying 5V to get millivolt output ??????
Please someone explain me ,In what way it is advantageous ..And if u know, please suggest me a sensor which consumes less input voltage ,may be in the range of millivolt.

Thank you..Have a nice day:):)
 

its not like if it gives millivolts then it had consumed all the rest,actually theres a threshold for everything,lets say if you wana find the energy consumed thats in joules what we do is E=PT (power dissipated*Time) now the actual power dissipated is much less in case of many other things .suppose in your case the actual current drawn by the sensor is veryy low now its (I^2)*R here(R=internal resistance of that sensor is very low and actual source of power dissipation) therefore due to low current its squared times is much lower hence we may say that its energy consumption is much less due to the small magnitude of current it draws.
 

Hi Usama,
I just want to put the question in other way .Instead of Supplying 5V input for sensor, getting millivolt output and using it for some application, why cant we directly use the 5V supply itself to serve our application ??
 

iscore said:
Hi Usama,
I just want to put the question in other way .Instead of Supplying 5V input for sensor, getting millivolt output and using it for some application, why cant we directly use the 5V supply itself to serve our application ??
Click to expand...

but how will you be able to sense the temperature difference?? i am not getting you,could you be a bit more brief?
 

Usama Siddiqui said:
i am not getting you,could you be a bit more brief?
Click to expand...

My aim is to generate the voltage using the temperature sensor in order to use it for some application (say to blink an led) instead of using another voltage source. Now if I have to supply 5V(from a voltage regulator output) to the sensor circuitry then I can as well use this 5v for my application! So is it possible to do what I have said above, to be able to use sensor op for the application?
This is the sensor I checked https://bit.ly/11z9Lqf

Thanks!
 

hi,
LM35 is a good temperature sensor IC. It has a linear temp./voltage dependency on it's full measuring scale (see datasheet). The same 5V power supply can feed the LM35 and all other circuits you may have with no trouble

Ps : the only temperature sensor that generates voltage is the thermocuple , based on the seebeck effect
 
Last edited:

I dont know if I'm getting you right or not, but is it that you are saying you want to convert body heat to voltage?? (do you mean convert body heat to watt?? conversion of energy??)
If thats your question, then you are looking for a heat transducer. Look at this https://www.ehow.com/how_7781256_make-simple-heat-transducer.html Is this a solution for you or you actually want a converter like piezoelectric transducer which convert mechanical energy to electrical rather in your case you want its heat that should be converted to electrical?
 
  • Like
Reactions: iscore

    I

    iscore

    Points: 2
    Helpful Answer Positive Rating
iscore said:
My aim is to generate the voltage using the temperature sensor in order to use it for some application (say to blink an led) instead of using another voltage source. Now if I have to supply 5V(from a voltage regulator output) to the sensor circuitry then I can as well use this 5v for my application! So is it possible to do what I have said above, to be able to use sensor op for the application?
This is the sensor I checked https://bit.ly/11z9Lqf

Thanks!
Click to expand...
yes bro you can do that,but its not a good practise ,what we do is that we use a microcontroller to interpret the signal of temp sensor and utilize in an any manner we like. but if you wanna use that directly then first of all you wud have to design a small opamp that could amplify the voltage and current (since the current of the temperature sensor's o/p is veryyyy low and it wont blink your LED ) and then you can do it,but before designing try lm741 it will do your job i guess. :)
 
  • Like
Reactions: iscore

    I

    iscore

    Points: 2
    Helpful Answer Positive Rating
shatruddha said:
I dont know if I'm getting you right or not, but is it that you are saying you want to convert body heat to voltage?? (do you mean convert body heat to watt?? conversion of energy??)
Click to expand...
Yes, I'm interested in conversion of energy.
shatruddha said:
If thats your question, then you are looking for a heat transducer. Look at this https://www.ehow.com/how_7781256_make-simple-heat-transducer.html Is this a solution for you or you actually want a converter like piezoelectric transducer which convert mechanical energy to electrical rather in your case you want its heat that should be converted to electrical?
Click to expand...
Thank you for the link, I need to check heat transducers. Yes, I can even add mechanical to electrical transducers in my project.


Usama Siddiqui said:
yes bro you can do that,but its not a good practise ,what we do is that we use a microcontroller to interpret the signal of temp sensor and utilize in an any manner we like. but if you wanna use that directly then first of all you wud have to design a small opamp that could amplify the voltage and current (since the current of the temperature sensor's o/p is veryyyy low and it wont blink your LED ) and then you can do it,but before designing try lm741 it will do your job i guess. :)
Click to expand...
Thanks brother, I got your point. :)
 

oh wow
good to know I got your point correctly. So all you are looking for is something like this **broken link removed**
and keyword for your search should be "thin film heat flux sensor"
 

shatruddha said:
oh wow
So all you are looking for is something like this **broken link removed**
Click to expand...
This looks nice, have you used them before? If yes, can you tell me its availability in India?

Thanks
 

I have not used it, but you can figure it out if its available in India. If you do not find, you can contact kitsnspares. They might be able to arrange it for you. (kitsnspares.com)
 
  • Like
Reactions: iscore

    I

    iscore

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top