- September 3, 2016 at 7:33 am #17114
Hey guys im building a mpcnc right now and im wondering, why do i need the 100ohm resistor and/or would it work with a 220 ohm one?
I’ve heard that you don’t need it if you are only planning to use it as a cnc router (which i am), and that you can just change something in the marlin firmware.September 3, 2016 at 7:36 am #17115
220 won’t work, pretty sure unless you change the thermistor value in the firmware. I think it would read too high of a temp.
The firmware change is easy, under thermister we have number 11, you just change it to a zero I believe and reflash it. There are actually notes in the firmware file. You might also need to disable temp checking in repetier if you do this.September 3, 2016 at 7:39 am #17117
Thanks for the fast reply, i will test the firmware change. Better than buying a set of resistors.September 3, 2016 at 7:58 am #17119
Sorry for being lazy and not looking at the firmware, I was having my first cup of coffee.
You can change this line
#define TEMP_SENSOR_0 11
To either 0 (not used) or the new firmware has a 998 (always show 25C) 998 would be best!September 3, 2016 at 8:24 am #17121
It’s ok I completely understood your first reply.November 22, 2016 at 3:24 am #21363
Not 100 ohm.
100,000 ohm (100K).
I used a plug from one of the stepper driver cables and soldered the resistor to the shortened wires, a bit fiddly but better than soldering directly to the header pins on the board.
But the firmware isn’t that scary to adjust, if you prefer.
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