Questions about MKS 1.4 & 100K Resistor

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3DStyle
Messages : 108
Enregistré le : 22 févr. 2018 14:34

Questions about MKS 1.4 & 100K Resistor

Message par 3DStyle »

Hi guys,

I made a terrible mistake and burnt my Arduino Mega 2560 and RAMPS 1.4 boards on the R-CNC.
Don't have the time to wait for the new boards I bought from Aliexpress. I have laying around a
MKS Gen 1.4 board which I want to use until I'll receive the boards that I ordered.

1. Is that okay to use the MKS Gen 1.4 with the R-CNC?
2. What is the use of the 100K resistor in the R-CNC? Do you have an idea where I should connect it to on the MKS Gen 1.4 board?

Image

I'll appreciate any kind of help!
Thanks.
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RoMaker
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Enregistré le : 02 janv. 2017 20:24
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Re: Questions about MKS 1.4 & 100K Resistor

Message par RoMaker »

Hi 3Dstyle !

You can not use this board instead Ramps besause on the MKS 1.4 the drivers are integrated and you can not plug "step" and "dir" wires :|
3DStyle
Messages : 108
Enregistré le : 22 févr. 2018 14:34

Re: Questions about MKS 1.4 & 100K Resistor

Message par 3DStyle »

Hi RoMaker, thanks for your answer!

My bad, I have the MKS Gen v1.4, which does have ports for external motor drivers.
I have this one:

Image

I just wonder where should I connect the 100K resistor in this board, and what is the purpose of it?

Thanks!
Aze
Messages : 1928
Enregistré le : 11 mars 2017 14:13

Re: Questions about MKS 1.4 & 100K Resistor

Message par Aze »

Hi,
you plug it to the E0 thermistor. It's just because there's a thermal control in the firmware (it's for 3D printers: if there is no thermal resistor, the firmware stops). In fact you can desactivate this somewhere in the firmware, but you have to search on google, I can't help you (and it's faster to just plug a resistor).
3DStyle
Messages : 108
Enregistré le : 22 févr. 2018 14:34

Re: Questions about MKS 1.4 & 100K Resistor

Message par 3DStyle »

Thank you very much Aze!

So basically the 100K resistor pretends to be a "heated nozzle", correct?
Kachidoki
Messages : 1549
Enregistré le : 18 août 2017 20:22

Re: Questions about MKS 1.4 & 100K Resistor

Message par Kachidoki »

I checked quickly into the Repetier code, it seems that replacing:

Code : Tout sélectionner

#define EXT0_TEMPSENSOR_TYPE 1
by:

Code : Tout sélectionner

#define EXT0_TEMPSENSOR_TYPE 0
should disable the thermistor and assume a fixed temperature of 25°C.
I have not tested myself but if it can help. ;)
Aze
Messages : 1928
Enregistré le : 11 mars 2017 14:13

Re: Questions about MKS 1.4 & 100K Resistor

Message par Aze »

3DStyle a écrit : 21 août 2018 18:32 So basically the 100K resistor pretends to be a "heated nozzle", correct?
It pretends to be a thermal resistor :P but yes, it's a bit like a "heated nozzle" if you want. The firmware just check if there is a value on the thermistor (100kohm, 2ohm, 100000kohm, everything but not infinity) otherwise it means than the thermal resistor is broken (it's a brittle component) and your house could burn :o
3DStyle
Messages : 108
Enregistré le : 22 févr. 2018 14:34

Re: Questions about MKS 1.4 & 100K Resistor

Message par 3DStyle »

Thanks guys, it works great! :)
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