In our CCCZH laboratory we are using the R2C2-Electronics from BitBox now.
The hotend is made by Wolfgang from reprap-fab.org.
First run. Uh! Oh! It’s smoking.
We had to drill and poke the PLA out of the PEEK.
What had happened?
Well. Math happened 🙂
http://ftp.o2s.ch/RepRap_BitBox_Wolfgang/calculus2.html
The Bitboxers obviously dimensioned their serial resistor for another thermistor.
Wolfgang is using the B57560G104F in his hotend.
So with a 10kΩ resistor in series the voltage on the ADC will look like that:

While basically it should look like that (with R1=500Ω):

Or in short: Let’s get the soldering iron again >.<
The C-Code will then look like that:

/* {ADC value Extruder0, ADC value HeatedBed0, temperature} */
uint16_t temptable[NUMTEMPS][3] = {
{950, 60, 300},
{1552, 95, 248},
{1891, 119, 226},
{2380, 215, 198},
{2653, 293, 183},
{3006, 447, 163},
{3294, 641, 145},
{3488, 865, 131},
{3765, 1408, 105},
{3901, 1906, 86},
{3999, 2732, 64},
{4053, 3352, 42},
{4077, 3755, 22},
{4089, 4085, 0}
};


In case you’re looking for a powerful stepper driver, take a look into this PDF: http://ftp.o2s.ch/RepRap/drivers_overview.pdf
It’s an overview of driver chips from ST.
I’ve chosen the L6208Q for my new RepRap-Electronics design.
It’s the strongest possible SMD part which still does PWM and stepping logic on it’s own.

If you wanna go SMD and you are looking for an alternative which is not as damn expensive as the L297 in SMD case, I’ll spare you the rest of the 20 awake nights.
It’s the A4989.
Under the following link you can buy one for around 4$ which is half of the price for an L297 in SMD:
http://www.digikey.ch/scripts/DKSearch/dksus.dll?Detail&itemSeq=116726484&uq=634771081247262960

As some of you maybe have learned, the last few weeks I was busy with my examina.
Beyond this, I sometimes relaxed my brain a little bit by tinkering around on my ASUS transformer prime.
As you certainly know, the ASUS transformer prime uses a TEGRA3 with the fuses burned into using an AES 128-Bit crypto engine, which forces one to use only bootloaders encrypted by ASUS.
My solution would have been to chainload U-Boot instead of a linux kernel and then using this U-Boot in order to allow multi boot and easier debugging and DeviceTree-Support and so on.
Unfortunately, this turns out to be quite unpracticable as the following mail dialog has destroyed my dreams of an easy solution:
http://www.mail-archive.com/u-boot@lists.denx.de/msg86389.html

And here the final destroying FAQ which bombs us back to square one:
http://www.denx.de/wiki/view/DULG/CanUBootBeConfiguredSuchThatItCanBeStartedInRAM

Maybe I should send the TF201 to China, ask them to unsolder the TEGRA3 and replace it by another non-fused TEGRA3…
Some black market guys will certainly be that kind and will do this… >.>

Hi folks
Everything works now

• WiFi
• USB
• All inputs
• 3D
• well… everything…

Next: Compiling Gentoo with KDE4 🙂