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  1. #1
    Student
    Join Date
    Nov 2013
    Location
    Haram, Giza, Egypt
    Posts
    22

    Question Electronics problem: Thermocouple reading on RAMPS 1.4

    Hi there RepRappers
    it looks like I've bought an MK8 extruder for my 3D printer but I found that the temperature sensor is a thermocouple and not a thermistor !!
    my electronics are:
    Arduino Mega 2560
    RAMPS 1.4
    I figured out that RAMPS 1.4 doesn't read thermocouple !!
    does this problem have a solution ??
    NOTE: I use sprinter and repetier firmwares.
    SAM_0134.jpg

  2. #2
    Engineer
    Join Date
    Oct 2013
    Location
    new jersey
    Posts
    752
    sure get a thermistor and either mount it in the block if there is a hole for it. if not and even a more accurate way is to take 1/4" kapton and tape it to the side of the nozzle. wrap the kapton tight. i use marlin and it has a PID auto tune feature. if your firmware has that then run it.

  3. #3
    Student
    Join Date
    Nov 2013
    Location
    Haram, Giza, Egypt
    Posts
    22
    that's not what I meant, I meant that RAMPS 1.4 doesn't read from a thermocouple !! ... but I searched for it and found that it needs an extra module "thermocouple amplifier".
    the most famous are AD595 op-amp circuit and MAX xxx something !!
    I will build my own amplifier and connect it between my thermocouple and RAMPS 1.4
    I found solutions there:
    solution
    reference RepRap Wiki

  4. #4
    Student BlackDragon's Avatar
    Join Date
    Dec 2013
    Location
    St. Louis, MO
    Posts
    21
    You're both right.

    If you want to use the thermocouple, you'll need the amplifier to bring the signal up to a stable and readable level.
    If you don't want to deal with the extra circuitry, though, you can certainly leave the thermocouple disconnected and install a thermistor, for standard operation.

    Personally, I don't have the experience with 3D printers to make a call on this, but from an electronics standpoint, the fewer circuits and signal modifiers you have, then easier it is to setup and troubleshoot.

    I don't recognize your printhead, so I'm not familiar with the layout. Would it be possible to remove the thermocouple and install a thermistor in its place?

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