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thermistor temperature

Posted by Giuseppe

Giuseppe

thermistor temperature
May 23, 2010 08:59AM

When I execute the Repstrap-commtest.py result is a temperature of 0 °C but this temperature is impossible. Why I obtein this result?

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casainho

Re: thermistor temperature
May 23, 2010 09:14AM

Registered: 14 years ago
Posts: 356

Maybe because 0 value is the initial value of the variable that holds temperature, on the firmware.

You have for sure a connection problem on the thermistor or something else.

---
New cutting edge RepRap electronics, ARM 32 bits @ 100MHz runs RepRap @ 725mm/s:

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Nivek

Re: thermistor temperature
June 17, 2010 07:58PM

Registered: 13 years ago
Posts: 6

I've got the exact same problem. Did you ever solve it?

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Nivek

Re: thermistor temperature
June 18, 2010 11:54AM

Registered: 13 years ago
Posts: 6

Update having added Serial.start(19200); to the setup() function of the extruder boards program Extruder.pde in the arduino environment.

I added to extruder_class extruder::internalTemperature right before return(celsius) :



Serial.println(celcius);

This reads the temperature so I will trace it ferther...

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Nivek

Re: thermistor temperature
June 18, 2010 02:55PM

Registered: 13 years ago
Posts: 6

Ok the reprap host software reads the temperature, but not regularly.
The temperature value only updates when the "Switch heat on button is pressed.
It doesn't update after that unless this button is pushed again.

Apparently the Ramp button is ineffective.
I guess these are all host software bugs.

thanks