Thermistor value table



  • I have a Rostock Max V2 which I upgraded to the Duet Wifi

    With the old rambo board , Mattercontrol and firmware you could define the Thermistor values.

    I was poking around and couldn't find anything about this. Is there a need to? Is there a place to do it?

    I found the information on the M305 command, is that the only option, if so does this look correct for the map below?

    M305 P1 R4700 T10000 B4092 C?

    Not sure where to get the C value from.

    Thanks

    // EPCOS 100K Thermistor (B57560G1104F)
    // Made with createTemperatureLookup.py (http://svn.reprap.org/trunk/reprap/firmware/Arduino/utilities/createTemperatureLookup.py)
    // ./createTemperatureLookup.py –r0=100000 --t0=25 --r1=0 --r2=4700 --beta=4092 --max-adc=1023
    // r0: 100000
    // t0: 25
    // r1: 0
    // r2: 4700
    // beta: 4092
    // max adc: 1023
    #define NUMTEMPS 20
    short temptable[NUMTEMPS][2] = {
    {1, 821},
    {54, 252},
    {107, 207},
    {160, 182},
    {213, 165},
    {266, 152},
    {319, 141},
    {372, 131},
    {425, 123},
    {478, 115},
    {531, 107},
    {584, 100},
    {637, 93},
    {690, 86},
    {743, 78},
    {796, 70},
    {849, 60},
    {902, 49},
    {955, 34},
    {1008, 3}
    };


  • administrators

    Looks like that table was generated assuming the beta-model of the thermistor, in which case it won't be accurate at high temperatures.

    Assuming that the thermistor you have is the B57560G1104F as mentioned in that table, then the data sheet for it is here http://www.mouser.com/ds/2/400/Glass_enc_Sensors__B57560__G560__G1560-525576.pdf and the following values should be good to use:

    M305 P1 R4700 T10000 T100000 B4148 C2.117e-7

    I obtained these values by taking the resistance at 25C, 150C and 275C from the table in the datasheet and putting them into the configtool calculator.



  • Thanks for the help.

    I get a temp error when using your M305 command.

    I even tried adding the H and L values from before.

    If I go back to the original line it works
    M305 P1 T100000 B3974 R4700 H30 L0



  • David think you mistyped the T param surely it should be T100000.



  • I think he meant T100000, not T10000.



  • Think I would try M305 P1 R4700 T100000 B4148 C2.117e-7



  • Thanks guys I didn't catch that.


Log in to reply