Geeetech

Hello, I am planning to change the thermistor from my Geeetech I3 Pro C printers. My printer has GT2560 Board. I am wondering about the technical specifications of thermistor used in my system. I have some 100K-ohm 104GT-2 NTC thermistors. Can I use these thermistor in my printer's hot-end? If so, do I need to change anything in the firmware? Please advice me what are the steps to do so. Thank you very much.

Hello, I have tried using Semitec 104GT-2 100k thermistor with Geeetech Pro C. I changed the Marlin firmware like below:

#define TEMP_SENSOR_0 5
#define TEMP_SENSOR_1 5
#define TEMP_SENSOR_BED 5

In the original firmware, "1" was used. But I think the thermistors I am talking about need "5" in these fields. I feel, it measures the temperature correctly with this new settings/thermistor. The only problem I am facing is, I can see in the LCD that temp measurement is quite slow. I mean, the actual temp probably have already reached to the set temp, but LCD is showing (due to slow process, I guess) temp what actually was before 15/20 sec. So, it overshoots greatly. After a long time, when temp gets steady, no more fluctuation, then LCD shows the correct temp. This is why I belief the sensor is working well. But probably I am missing something. I am just wondering, is it something like, P, I, & D values in the firmware are not optimal for this thermistor? Please help me advising how can I use this new thermistor here. Thank you very much.

is your new thermistor reads the temp correctly? I mean you can use an original one and a new one, set them to the same temperature and verify it.
don't know much about the PID thing, never study it before...