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Thermistor problems

nosouforyou

Thermistor problems
March 06, 2013 08:32AM

Registered: 11 years ago
Posts: 7

Running a sanguinololu 1.3a and running pronterface my thermistors are constantly returning 79 degrees for extruder and 90 degrees for bed. is my board blown? or do i need to fiddle with settings or configuration.h? hoping its the latter, obviously.

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nosouforyou

Re: Thermistor problems
March 06, 2013 08:51AM

Registered: 11 years ago
Posts: 7

T:78 @:0 B:96 rather.

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waitaki

Re: Thermistor problems
March 06, 2013 05:20PM

Registered: 11 years ago
Posts: 1,592

You mean at room temp?

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brnrd

Re: Thermistor problems
March 06, 2013 06:12PM

Registered: 13 years ago
Posts: 1,780

You probably have the wrong thermistor tables loaded in the firmware. You need to edit your configuration.h to select the correct one and then reload the firmware.

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nosouforyou

Re: Thermistor problems
March 07, 2013 12:02AM

Registered: 11 years ago
Posts: 7

is it just a matter of going through the list of 7 different thermistors in configuration.h and trying each one til i get an accurate reading? and @ waitaki yeh at room temp.

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brnrd

Re: Thermistor problems
March 07, 2013 12:46AM

Registered: 13 years ago
Posts: 1,780

You should know what you have from your source.

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nosouforyou

Re: Thermistor problems
March 07, 2013 12:50AM

Registered: 11 years ago
Posts: 7

nah i bought a reprap second hand after a friend got a makerbot. he cant remember what they are so yeh. all i know is one is 100K and 4066 beta value.

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brnrd

Re: Thermistor problems
March 07, 2013 01:07AM

Registered: 13 years ago
Posts: 1,780

The problem with the Marlin and Sprinter firmware is that they didn't include those values in the table. I wished they did. smiling smiley

According to the reprap wiki,, that should be a EPCOS 100K Thermistor (B57540G0104F000). which is #1.

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nosouforyou

Re: Thermistor problems
March 07, 2013 06:25AM

Registered: 11 years ago
Posts: 7

yeh i used that, and even tried all the others. if i pick a different thermistor in configuration.h then i'll get a different temp, but its still way too high and doesnt change even when extruder is heated up.

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brnrd

Re: Thermistor problems
March 07, 2013 02:59PM

Registered: 13 years ago
Posts: 1,780

Your configuration files might be bad. What is the firmware? Did you edit anything besides configuration.h?