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flyguy

Enable Heater 2 and Hot_bed

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Posted · Enable Heater 2 and Hot_bed

Is there anything special that needs to be done to enable the Heater2 and hot bed transistors ? I have tried use these but the lights never come on.

Thanks

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Posted · Enable Heater 2 and Hot_bed

You'll have to compile the firmware with a heated bed enabled or 2nd extruder enabled. But then they work.

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Posted · Enable Heater 2 and Hot_bed

In stead of messing with the code of Marlin, I started to swap out resistors 4.7k ohm was what I have been using this whole time. I tried 10k with no better results.

With each resistor I recompiled the look up table with the Python script from Rep Rap

22k ohm works ! It starts off around ~ -20 only 2 less then the last value in the table {1008, -22}

47k ohm works as well but it starts around -44

Testing the 22k ohm resistor, Using my fingers to heat up the resistor It only returns a result of ~9c which means I should be dead.

But I don't care, its working with out messing with any Marlin Code and no need to pre-heat the resistor.

I'll be testing the results of the 22k ohm resistor at 60c, 70c, 80c, 90c, 100c with my toaster oven.

( I have one of reflow solder hacks that controls the oven's temp with an external micro controller)

Thanks for everyone listening and reading to my troubles,

Brian

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