BS1 and Thermistor
kishkumen
Posts: 3
Dear Sir:
I need some help. I want to use a Thermistor to read temperature in my smoker. I seen in the Stamp1 manual about using a Thermistor from Radio Shack to read the temperature, but this Thermistor is no longer carried by Radio shack. I can of course can get a different make.
My question is will the different type Thermistor read so far off that it will not work and can it read higher then 149 deg.
I need to read up to 170·deg
Thank You,
Kishkumen
Post Edited (kishkumen) : 12/14/2009 8:30:01 AM GMT
I need some help. I want to use a Thermistor to read temperature in my smoker. I seen in the Stamp1 manual about using a Thermistor from Radio Shack to read the temperature, but this Thermistor is no longer carried by Radio shack. I can of course can get a different make.
My question is will the different type Thermistor read so far off that it will not work and can it read higher then 149 deg.
I need to read up to 170·deg
Thank You,
Kishkumen
Post Edited (kishkumen) : 12/14/2009 8:30:01 AM GMT
Comments
I'm not sure what Thermistor Your useing,·But if You post the code Your useing
We'll help You make it work!
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The Truth is out there············___$WMc%___···························· BoogerWoods, FL. USA
To help You to get the hang of the forums, You need to fill in the subject part of the POST. its not a biggy, but some others will crip about "no subject" on Your post.
Simply click on the pencil icon on Your post and You can easily edit Your post.
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The Truth is out there············___$WMc%___···························· BoogerWoods, FL. USA
I'm using part of the code that parallax siad to use with a Thermistor, the Thermistor I want to use is a NTC-101.
Here is the program.
' {$STAMP BS1}
' Program THERM-A.BAS
' This program reads a thermistor with the BASIC pot command,
' computes the temperature using a power-series polynomial equation,
' and reports the result to a host PC via the Stamp cable
' using the debug command.
' Symbol constants represent factored portions of the coefficients
' C0, C1, and C2. "Top" and "btm" refer to the values' positions in
' the fractions; on top as a multiplier or on the bottom as a divisor.
SYMBOL co0 = 162
SYMBOL co1top = 255
SYMBOL co1btm = 2125
SYMBOL co2bt1 = 25
SYMBOL co2top = 3
SYMBOL co2btm = 50
Check_temp:
PAUSE 1000 ' pause 1 sec
POT 0,46,W0 ' 46 is the scale factor.
LET W1 = W0*W0/co2bt1*co2top/co2btm
LET W0 = W0*co1top/co1btm+W0
LET W0 = co0+W1-W0
LET PINS = 00100000 'All pins set to input except pin 2
DEBUG W0 ' show smoker temp on main computer
IF PIN1 = 1 THEN lowtemp 'next four pins are temp zones
IF PIN3 = 1 THEN midtemp
IF PIN4 = 1 THEN Hightemp
IF PIN5 = 1 THEN steamtemp
lowtemp: IF W0 > 130 THEN lowtemp_A
IF W0 < 128 THEN lowtemp_B
lowtemp_A:
LOW 2
GOTO Check_temp
lowtemp_B:
HIGH 2
GOTO Check_temp
midtemp: IF W0 > 145 THEN midtemp_A
IF W0 < 143 THEN midtemp_B
midtemp_A:
LOW 2
GOTO Check_temp
midtemp_B:
HIGH 2
GOTO Check_temp
Hightemp: IF W0 > 160 THEN Hightemp_A
IF W0 < 158 THEN Hightemp_B
Hightemp_A:
LOW 2
Hightemp_B:
HIGH 2
GOTO Check_temp
steamtemp: IF W0 < 250 THEN steamtemp_A
steamtemp_A:
HIGH 2
GOTO Check_temp
END
Dose your local RadioShack carry any other thermistor?
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The Truth is out there············___$WMc%___···························· BoogerWoods, FL. USA
Take a look at the Parallax web site home page.
Surf there home site well, I think you'll find what Your after.
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The Truth is out there············___$WMc%___···························· BoogerWoods, FL. USA
I did as you said, I looked·at the Parallax web site good and found no Thermistor listed there.
No, Radio Shack does not handle any Thermistors at this time.
Thank you for your help.
Kishkumen
PM·me your address and I'll mail you a RadioShack thermistor, SKU # 271-110 such as seen at http://www.extremenxt.com/temp.htm . Discontinued many moons ago, I still have a couple new units.
Merry Christmas from erco!
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·"If you build it, they will come."