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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.
Attachment 261
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.
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
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?