Link to NTC Thermistor Projects

Archiver

Fellows
Has anyone got any link to any thermistor projects
i am finding it hard to understand how to make the temperature readings
linear
Any help would be much appreciated

Isaac

Archiver

Have a look at http://www.al-williams.com/paktemp.htm

You can also try with a lookup table -- there must be something out there
pertaining to that.

I'm guessing Dr. Allen has something too at http://www.emesystems.com

Regards,

Al Williams
AWC
*NEW: Read position data from any PS/2 mouse:
http://www.al-williams.com/pak11.htm




>

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Original Message

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> From: Isaac. Aiyanyo [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=ZtKxeEDm8cX0sNHA6jhmGp9zySyCHwzaMj5cfIIcj6_STRDQZRWt-NZTlSyR1XLYaTbK5ZGblgqN0AU_XFX7bQ]isaac.aiyanyo@n...[/url
> Sent: Monday, November 10, 2003 2:53 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Link to NTC Thermistor Projects
>
>
> Fellows
> Has anyone got any link to any thermistor projects
> i am finding it hard to understand how to make the
> temperature readings linear Any help would be much appreciated
>
> Isaac
>
>
>
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Archiver

http://www.emesystems.com/BS2math7.htm#thermistor

This URL uses a lookup table with interpolation.

-- Tracy



>Have a look at http://www.al-williams.com/paktemp.htm
>
>You can also try with a lookup table -- there must be something out there
>pertaining to that.
>
>I'm guessing Dr. Allen has something too at http://www.emesystems.com
>
>Regards,
>
>Al Williams
>AWC
>*NEW: Read position data from any PS/2 mouse:
>http://www.al-williams.com/pak11.htm
>
>
>
>
>>

---

Original Message

---

>> From: Isaac. Aiyanyo [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=HU0VI_ScWJ833vQhr3Ll7e0A4EoPS2rFRn7nfQKIv4pLvNZDjiaaaYkimzNSCNL-ocXL1F0qC0nlOqLqemkqmlzU]isaac.aiyanyo@n...[/url
>> Sent: Monday, November 10, 2003 2:53 PM
>> To: basicstamps@yahoogroups.com
>> Subject: [noparse][[/noparse]basicstamps] Link to NTC Thermistor Projects
>>
>>
>> Fellows
>> Has anyone got any link to any thermistor projects
>> i am finding it hard to understand how to make the
>> temperature readings linear Any help would be much appreciated
>>
>> Isaac
>>
>>
>>
>> To UNSUBSCRIBE, just send mail to:
>> basicstamps-unsubscribe@yahoogroups.com
>> from the same email address that you subscribed. Text in the
>> Subject and Body of the message will be ignored.
>>
>>
>> Your use of Yahoo! Groups is subject to
>> http://docs.yahoo.com/info/terms/
>>
>>
>>
>>
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the
>Subject and Body of the message will be ignored.
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

Archiver

Thanks A Williams for the link you sent me i found it to be very
educative and i have learn't a lot from it and would be
needing all the help i can get from you all for this project.
i am thinking of using this example program by Dr. Allen
http://www.emesystems.com/BS2math7.htm#interpolation
( Interpolation of thermistor readings)
This particular thermistor obeys the simplified Steinhart-Hart equation

T=(B/(ln(R)-A))-CBut the Thermistor i am using is from the RS catalogue
stock number 151-215
and this gives 2 tables with values for A,B,C and D on page 2 (material
type F)
which of the 2 tables would i need to use and can i just use A,B & C and
leave out the D value?

Isaac


[noparse][[/noparse]Non-text portions of this message have been removed]

Archiver

> Thanks A Williams for the link you sent me i found it to be very
>educative and i have learn't a lot from it and would be
> needing all the help i can get from you all for this project.
> i am thinking of using this example program by Dr. Allen
>http://www.emesystems.com/BS2math7.htm#interpolation
> ( Interpolation of thermistor readings)
>This particular thermistor obeys the simplified Steinhart-Hart equation
>
>T=(B/(ln(R)-A))-CBut the Thermistor i am using is from the RS catalogue
>stock number 151-215
>and this gives 2 tables with values for A,B,C and D on page 2 (material
>type F)
>which of the 2 tables would i need to use and can i just use A,B & C and
>leave out the D value?
>
> Isaac

By the way, the particular thermistor for that interpolation was one
from Unidata Australia, part of a water depth gage instrument,
described in more detail here:
http://www.unidata.com.au/product/docs/6207.pdf

Do you have a link for the thermistor 151-215? It did not come up
for me on the 'shack web site.

I don't know what the parameter "D" is. The Steinhart-Hart equation
has only three terms:
1/T = A + B * ln(R) + C * (ln(R))^3

The tables of temperature vs resistance (if that is what they are)
would give you all the information you need to implement the
interpolation.

-- Tracy

Archiver

> Do you have a link for the thermistor 151-215? It did not come up
> for me on the 'shack web site.
Sorry if i gave you the wrong impression
The thermistor i am using is in the RS Catalugue
and the stock number is 151-215 this can be found on page 5 of the rsdata1
pdf i attach
while the A,B,C and D values i mention eariler are in the other pdf also
attached


Thanks in advance
Isaac


[noparse][[/noparse]Non-text portions of this message have been removed]