[Swansea Hackspace] 3D Printer electronics

[Emyr Morris]

Great news 👍

Thank you

On Saturday, February 28, 2015, Justin Mitchell <
justin at swansea.hackspace.org.uk> wrote:

>
> > Just found circuit diagram,
> >
> > http://reprap.org/mediawiki/images/7/7d/Melzi-circuit.png
> >
> > we could simply re-map Hot end to the AUX header, and change code in
> micro
> > ??
> >
> > Hot End on PA7 -> PA4.
> >
> > just need a 4K7 resistor !!
> >
> > Bit concerned that ALL sensors have 4u7F caps on them !!
> >
>
> Having poked around the circuit diagram for the Melzi some more, it
> turns out that EXT-A4 is also where the debug LED is wired on the board,
> so marlin has that configured as an output, and it has resistors on it
> etc.
>
> I have moved the temp sensor parts to a pin header so that i could more
> easily change which input they connected through to.
>
> With the thermistor remapped to A3 i now get plausible temperature readings
>
> Should now be possible to reassemble the printer with the old board
> whilst we work on repairing the larger board required for the upgrades
> to be fitted.
>
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