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Marlin firmware gives wrong temperature values

Posted by someoneonly 
Marlin firmware gives wrong temperature values
April 25, 2015 10:20AM
I have been trying to update my marlin firmware in order to get accurate results for my printing but the temperature the new firmware gives is way too high (48 as compared to 32(usual)). Im using a Prusa i3 with a knockoff melzi board with 1284p processor. I have aslo replaced the jhead with an e3d lite6.

This is the original thermal settings
#define E_BETA 3950.0
#define E_RS SERIAL_R
#define E_NTC 100000.0
#define E_R_INF ( E_NTC*exp(-E_BETA/298.15) )

#define BED_BETA 3950.0
#define BED_NTC 100000.0

This is the new thermal settings that arent quite right

#define TEMP_SENSOR_0 5
#define TEMP_SENSOR_1 0
#define TEMP_SENSOR_2 0
#define TEMP_SENSOR_3 0
#define TEMP_SENSOR_BED 11

Other information :
I noticed that the marlin firmware has 2 different melzi boards at 63 and 66 , I have tried both.
When I unplug the thermistor it becomes 0 degrees and the mintemp error shows up.
BOTH the extruder and the heated bed suffer from this issue.

Any help would be greatly appreciated I am close to smashing my printer after 6 months of troubleshooting .
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