It seems to be solved. I just tried to connect each pin of the duet marked "used" (with dupont connectors), according to the wiring scheme , to my Raspeberry and they communicate. So I freed the GPIO 3.
I then started looking around and noticed the 3.3V pin at the daughterboard on the 3EXP was not giving any voltage but the 3.3V pins on the IO are putting out appropriate voltage without issue. The 3.3V LED is on as well.
There are two 3.3V rails on the 3HC (and on the 6HC): an "internal" one for the processor, other on-board electronics and the daughterboard connector, and another for the +3.3v power on the IO connectors. The green LED indicates whether the internal 3.3v supply is present.
Did you measure the 3.3v pin on the 3HC daughterboard connector with the daughterboard removed? If so, then the most likely reason for not getting +3.3V on pin 8 of the daughterboard connector is a bad solder joint on the connector itself. Does that joint look OK?
Or did you have the daughterboard connected, and you were measuring the 3.3V pin on the daughterboard itself? If so then check for an unsoldered pin on the connector on the daughterboard. That connector has to be hand-soldered, so it's not impossible that a pin has been missed.
That's a good idea, since the tripod (as I envision it) has it's own non-linear kinematics?
How often will you need these servos? Does your bed misalign so frequently, that it's worth the efford?
My bed rests on three ballscrews and I haven't had to touch their adjustment since day 1.
Over time the bed does move as it's just cantilevered from the rails at the back of the printer. It's not much in terms of bed adhesion, it's more about ensuring part parallelism.
At the end save the zip file and then upload it to the web interface system tab.
You can't move a motor before it's been homed by default.
If you want to force motor movement to see if it's working you can send G92 X100 Y100 Z100 to trick the firmware into thinking the axis have been homed. You can then use the jog buttons to move the motors but be careful because without the proper axis dimensions and homing sequence it won't know the actual position of the print head and will gladly smash into the frame if you tell it to.
Careful, that link actually doesn't apply to the Duet3.
It works for my Duet3 6HC without major issues. The only piece of information missing is to pull the SBC jumpers.
Yeah you're right. Every time I look at the schematic, I get a headache.
The description for the PS_ON header says...
3-pin KK labelled PS_ON: open drain mosfet output for controlling an ATX-style power supply or a SSR. The +5V pin can also be used to provide external 5V power. A small amount of 5V power can be drawn from this pin (through an internal 220 ohm resistor), so that the control terminals of an SSR can be connected directly between the +5V and PS_ON pins. Note: on the v0.5 board this connector is rotated 180 degrees compared to the intended orientation on later version boards.
It doesn't actually say that you can PROVIDE power via that header.
The schematic does show that you can input 5V from that header but if you try to draw 5V from it, it goes through the 220ohm resistor.
I don't think it would pose a long term issue, however that is not up to our standards and we will gladly issue a replacement to alleviate your concerns. Please contact your vendor and initiate a warranty exchange. Include a link to this thread as authorization. Sorry for the inconvenience.
Thank you very much. I am in Canada. I would not be normally concerned about this in any consumer electronics, but I have seen and measured how hot the TMC drivers normally run and over time I think it could be a potential reliability issue (I'm an engineer)...
Oh, and no need to apologise, I know quite well this is an imperfect world!