SoliForum - 3D Printing Community — Thermistor is not reading correct temperature for heated bed

Re: Thermistor is not reading correct temperature for heated bed

null@example.com (carl_m1968) — Sat, 17 Oct 2015 00:12:58 +0000

madfalcon81 wrote:

Carl: I have no idea what kind of thermistor it is. The stock one of Press, didnt change anything on this. As for sensor I will take a look, if I will figure out where to look

Look in the configuration.h tab of your firmware and near the top after the legalese you will see the following lines or similar.

#define TEMP_SENSOR_0 0
#define TEMP_SENSOR_1 0
#define TEMP_SENSOR_2 0
#define TEMP_SENSOR_BED 0

Those should read:

#define TEMP_SENSOR_0 1
#define TEMP_SENSOR_1 0
#define TEMP_SENSOR_2 0
#define TEMP_SENSOR_BED 1

If they do not then change them and flash the firmware again.

Re: Thermistor is not reading correct temperature for heated bed

null@example.com (carl_m1968) — Fri, 16 Oct 2015 23:30:07 +0000

n2ri wrote:

also check polarity +/-

A thermistor does not have polarity n2ri, maybe you are thinking of a thermocouple?

Re: Thermistor is not reading correct temperature for heated bed

null@example.com (n2ri) — Fri, 16 Oct 2015 23:26:34 +0000

also check polarity +/-

Re: Thermistor is not reading correct temperature for heated bed

null@example.com (madfalcon81) — Fri, 16 Oct 2015 22:19:41 +0000

Carl: I have no idea what kind of thermistor it is. The stock one of Press, didnt change anything on this. As for sensor I will take a look, if I will figure out where to look

Re: Thermistor is not reading correct temperature for heated bed

null@example.com (carl_m1968) — Fri, 16 Oct 2015 20:05:14 +0000

madfalcon81 wrote:

EMC2 Robo wrote:
Hello madfalcon81,
Please explain in detail your issue, try and add pictures and maybe I can help.
Good Luck:-)
When I start the printer it showed the bed temp at 22 C (normal room temp), and extruder temp at 175 C. ??!? Remove total power, 1 day break , then 155 C. Another day, 75 C. The closest to normal was 50 C (normal should have been 22 C). When I heat the extruder it heats but I dont know the temperature (very hot anyway) and the printer doesnt work (it catches the first layer, or it stops extruding (due to hot temp it cannot push the filament). On short, the reading is herratic. How much is the resistance on room temp ? More when NOT on phone Thanks !

At room temp assuming you are using a 100K thermistor which is normal
the resistance should be around 100K out of circuit.

What type of sensor do you have selected in the firmware? Should be set for 1.

Re: Thermistor is not reading correct temperature for heated bed

null@example.com (madfalcon81) — Fri, 16 Oct 2015 19:41:05 +0000

EMC2 Robo wrote:

Hello madfalcon81,
Please explain in detail your issue, try and add pictures and maybe I can help.
Good Luck:-)

When I start the printer it showed the bed temp at 22 C (normal room temp), and extruder temp at 175 C. ??!? Remove total power, 1 day break , then 155 C. Another day, 75 C. The closest to normal was 50 C (normal should have been 22 C). When I heat the extruder it heats but I dont know the temperature (very hot anyway) and the printer doesnt work (it catches the first layer, or it stops extruding (due to hot temp it cannot push the filament). On short, the reading is herratic. How much is the resistance on room temp ? More when NOT on phone Thanks !

Re: Thermistor is not reading correct temperature for heated bed

null@example.com (EMC2 Robo) — Fri, 16 Oct 2015 15:50:40 +0000

Hello madfalcon81,

Please explain in detail your issue, try and add pictures and maybe I can help.

Good Luck:-)

Re: Thermistor is not reading correct temperature for heated bed

null@example.com (madfalcon81) — Fri, 16 Oct 2015 06:25:34 +0000

I have somehow the same problem, but with the extruder temp. Still havent fixed it

Re: Thermistor is not reading correct temperature for heated bed

null@example.com (EMC2 Robo) — Fri, 16 Oct 2015 05:30:33 +0000

Brother I got you on a case of beer and a bottle, LOL. I am not kiddding:-) You are awesome!

I am not certain exactly, but my Azteeg X3 Pro board is not giving me proper readings on: Heated Bed, TC0, TC1, TC2

I only get proper readings from TC3, and TC4. The board looks fine, there does not seem to be any fiscal damage to board. I have emailed Panucatt in hopes they will send me a replacement board. I will update if they respond... we will see.

Right now I am figuring out how to properly calibrate X, Y, Z, E1, E2... then I am done with this machine.

Any thoughts? I am open to suggestions.

Re: Thermistor is not reading correct temperature for heated bed

null@example.com (carl_m1968) — Fri, 16 Oct 2015 05:19:47 +0000

Woohoo! Wheres my beer???

Just joking, glad you got it working mind if I ask what the actual problem was?

Re: Thermistor is not reading correct temperature for heated bed

null@example.com (EMC2 Robo) — Fri, 16 Oct 2015 05:04:12 +0000

Hello Everyone,

This is my latest update on "Thermistor is not reading correct temperature for heated bed".

Woohoo... I was finally able to get my thermistor reading the proper temperature. After taking apart my heated bed, purchasing new thermistors, and configuring every option in Repetier and Marlin (took me over two weeks) the problem was my Azteeg X3 Pro board. For some reason my Heated Bed, TC0, TC1, TC2 are all giving me incorrect temperature readings. I was only able to get a proper temp reading from TC3, and TC4 on my Azteeg X3 Pro board.

WOW, this has been a nightmare for me but it is finally over. I would like to give a very special thank you to "carl_m1968". Without your guidance and feedback I am certain I would have given up. I have spent many hours searching online for the correct information and anytime I could not find an answer "carl_m1968" was always here ready to help. Thank you friend, from the bottom of my heart:-)

With that being said, if you are having trouble with you heated bed thermistor like I was, read through this thread and see what we did to troubleshoot until we fixed our problem.

What I learned about thermistors and heated bed:

1. Check Hardware and ensure you choose proper setting
2. Double check wires are not loose, cut or exposed
3. Once connected properly you should see room temp reading
4. Use a Heated Gun or Hair Dryer to ensure the Temp reading is correct and working properly
5. Having additional thermistors can help you see if problem is thermistor or your board
6. Heated Bed will not warm if Temp reading is wrong or if setting is incorrect

Thank you to all who contribute and good luck to all builders.

Re: Thermistor is not reading correct temperature for heated bed

null@example.com (carl_m1968) — Sun, 11 Oct 2015 04:04:28 +0000

EMC2 Robo wrote:

Ok, so I got it to compile without any errors.
I did so by
Unziped the file “LiquidTWI2-master.zip”. The directory “LiquidTWI2-master” will be created
Moved the directory to: …[current user]
Rename the directory “LiquidTWI2-master” to “LiquidTWI2”.
I am uploading your Marlin files now.
Update:
I have uploaded the files you have given me, but I am still unable to get a proper reading from my heated bed. I also had to change:
#define TEMP_0_PIN         5  // ANALOG NUMBERING
  #define TEMP_1_PIN         4   // ANALOG NUMBERING
to
#define TEMP_0_PIN         4  // ANALOG NUMBERING
  #define TEMP_1_PIN         5   // ANALOG NUMBERING
I was not getting a proper reading from my extruder.
Update:
I am now getting a correct reading on my extruder, but my heated bed thermistor is still giving me the same readings I have posted before.
Heated Bed Thermistor still not working properly.
I am open to any suggestions, thank you.

Ok I am going on the assumption that maybe the bed temp sense input is damaged so we are going to use a different input. Physically move the bed thermistor connection from BED to T2. Then in the firmware change the pin for BED to 12.

Re: Thermistor is not reading correct temperature for heated bed

null@example.com (EMC2 Robo) — Sun, 11 Oct 2015 03:12:49 +0000

Ok, so I got it to compile without any errors.

I did so by

Unziped the file “LiquidTWI2-master.zip”. The directory “LiquidTWI2-master” will be created
Moved the directory to: …[current user]
Rename the directory “LiquidTWI2-master” to “LiquidTWI2”.

I am uploading your Marlin files now.

Update:

I have uploaded the files you have given me, but I am still unable to get a proper reading from my heated bed. I also had to change:

#define TEMP_0_PIN         5  // ANALOG NUMBERING
  #define TEMP_1_PIN         4   // ANALOG NUMBERING

#define TEMP_0_PIN         4  // ANALOG NUMBERING
  #define TEMP_1_PIN         5   // ANALOG NUMBERING

I was not getting a proper reading from my extruder.

Update:

I am now getting a correct reading on my extruder, but my heated bed thermistor is still giving me the same readings I have posted before.

Heated Bed Thermistor still not working properly.

I am open to any suggestions, thank you.

Re: Thermistor is not reading correct temperature for heated bed

null@example.com (carl_m1968) — Sun, 11 Oct 2015 03:01:18 +0000

Did you import the library properly? it should tell you library imported at the bottom of the screen in Arduino.

Re: Thermistor is not reading correct temperature for heated bed

null@example.com (EMC2 Robo) — Sun, 11 Oct 2015 02:59:18 +0000

Got it, but it keeps giving me this error message:

In file included from ultralcd.cpp:41:
ultralcd_implementation_hitachi_HD44780.h:172: error: 'LiquidTWI2' does not name a type
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_set_custom_characters()':
ultralcd_implementation_hitachi_HD44780.h:366: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_init()':
ultralcd_implementation_hitachi_HD44780.h:391: error: 'lcd' was not declared in this scope
ultralcd_implementation_hitachi_HD44780.h:391: error: 'LTI_TYPE_MCP23017' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_clear()':
ultralcd_implementation_hitachi_HD44780.h:417: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_printPGM(const char*)':
ultralcd_implementation_hitachi_HD44780.h:425: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_status_screen()':
ultralcd_implementation_hitachi_HD44780.h:485: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_drawmenu_generic(uint8_t, const char*, char, char)':
ultralcd_implementation_hitachi_HD44780.h:633: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_drawmenu_setting_edit_generic(uint8_t, const char*, char, char*)':
ultralcd_implementation_hitachi_HD44780.h:655: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_drawmenu_setting_edit_generic_P(uint8_t, const char*, char, const char*)':
ultralcd_implementation_hitachi_HD44780.h:677: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_drawedit(const char*, char*)':
ultralcd_implementation_hitachi_HD44780.h:732: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_drawmenu_sdfile_selected(uint8_t, const char*, const char*, char*)':
ultralcd_implementation_hitachi_HD44780.h:746: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_drawmenu_sdfile(uint8_t, const char*, const char*, char*)':
ultralcd_implementation_hitachi_HD44780.h:766: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_drawmenu_sddirectory_selected(uint8_t, const char*, const char*, char*)':
ultralcd_implementation_hitachi_HD44780.h:786: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_drawmenu_sddirectory(uint8_t, const char*, const char*, char*)':
ultralcd_implementation_hitachi_HD44780.h:807: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_update_indicators()':
ultralcd_implementation_hitachi_HD44780.h:877: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'uint8_t lcd_implementation_read_slow_buttons()':
ultralcd_implementation_hitachi_HD44780.h:893: error: 'lcd' was not declared in this scope
ultralcd_implementation_hitachi_HD44780.h:895: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd_implementation_hitachi_HD44780.h:895: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_status_screen()':
ultralcd.cpp:246: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:246: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_main_menu()':
ultralcd.cpp:337: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:337: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_tune_menu()':
ultralcd.cpp:420: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:420: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_preheat_pla_menu()':
ultralcd.cpp:558: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:558: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_preheat_abs_menu()':
ultralcd.cpp:578: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:578: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_prepare_menu()':
ultralcd.cpp:608: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:608: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void _lcd_move(const char*, int, int, int)':
ultralcd.cpp:674: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:674: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_move_e()':
ultralcd.cpp:698: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:698: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_move_menu_axis()':
ultralcd.cpp:703: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:703: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_move_menu()':
ultralcd.cpp:733: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:733: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_control_menu()':
ultralcd.cpp:744: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:744: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_control_temperature_menu()':
ultralcd.cpp:773: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:773: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_control_temperature_preheat_pla_settings_menu()':
ultralcd.cpp:810: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:810: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_control_temperature_preheat_abs_settings_menu()':
ultralcd.cpp:827: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:827: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_control_motion_menu()':
ultralcd.cpp:844: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:844: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_control_volumetric_menu()':
ultralcd.cpp:880: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:880: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_sdcard_menu()':
ultralcd.cpp:955: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:955: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp:958: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:958: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_int3()':
ultralcd.cpp:1038: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1038: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_callback_int3()':
ultralcd.cpp:1038: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1038: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_float3()':
ultralcd.cpp:1039: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1039: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_callback_float3()':
ultralcd.cpp:1039: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1039: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_float32()':
ultralcd.cpp:1040: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1040: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_callback_float32()':
ultralcd.cpp:1040: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1040: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_float43()':
ultralcd.cpp:1041: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1041: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_callback_float43()':
ultralcd.cpp:1041: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1041: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_float5()':
ultralcd.cpp:1042: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1042: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_callback_float5()':
ultralcd.cpp:1042: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1042: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_float51()':
ultralcd.cpp:1043: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1043: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_callback_float51()':
ultralcd.cpp:1043: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1043: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_float52()':
ultralcd.cpp:1044: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1044: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_callback_float52()':
ultralcd.cpp:1044: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1044: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_long5()':
ultralcd.cpp:1045: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1045: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_callback_long5()':
ultralcd.cpp:1045: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1045: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_update()':
ultralcd.cpp:1245: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1245: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_buzz(long int, uint16_t)':
ultralcd.cpp:1439: error: 'lcd' was not declared in this scope
ultralcd.cpp: In function 'bool lcd_clicked()':
ultralcd.cpp:1445: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1445: error: 'BUTTON_RIGHT' was not declared in this scope