Posts made by PascalM

@T3P3Tony I testet with the pre release. It is working at 1Hz again.

Hi,
I upgraded my Duet 3 6HC from 3.5.0 beta 2 to beta 3 and found out that my bed heater turned on permamently.
I have configured the bed heater output to 1Hz PWM and up until now it worked flawlessly. The output controls a 230V solid state relay that switches on zero-crossings of the 50Hz mains supply, therefore I want a slow enough PWM frequency to have reasonable resolution of bed heater power.

I tested 2Hz and the problem remains, at 3Hz the output seems to be working again as intended.
Therefore, as a workaround, 3Hz is ok, but my effective PWM resolution is really bad.
Fortunately, at 60°C bed temperature, its still acurate enough to have the bed temperature rock solid at 60.0°C even without fluctuations to 60.1 or 59.9. Might get worse at lower temperatures.

I guess it is a result of the changed PWM resolution in beta 3
("[Duet 3 MB6HC] [Duet 3 MB6XD] [Duet 2] [Duet Maestro] PWM resolution when using outputs connected to the PWM peripheral is increased")
Is it possible to have an option to enable/disable the higher PWM precision, or automatically use reduced resolution PWM, when requested PWM is too low?

At least, for safety, I would advise to disable the output and give an error if a too low frequency is requested. I protected my bed with a thermal switch and a thermal fuse, but it might not be on every printer.

My configuration of the heater:
In sys config.g

M308 S0 P"temp0" Y"thermistor" T100000 B4583 C1.022833e-7 
M950 H0 C"out0" T0 Q1
M307 H0 B0 S1.00
M140 H0
M143 H0 S130

Override with the tuning at 60°C for the filament I tested with, in filaments config.g

M307 H0 R0.15 K0.161:0.000 D9.31 E1.35 S1.00 B0

Yes, I tried with a different card.
I also checked both sd cards with chkdsk, and reformatted one card with FAT32 with 32k clusters.
No success, same error.

Hello,

i just got my new DuetWifi today and tried to set it up.
But after setting up the Wifi, i found, that the board isn't able to access the provided sd card.
I tried to update the firmware, but that was not possible from the wifi page (probably, because the firmware wants to cache the new firmware on sd card). Therefore, i updated the firmware with the Atmel tool via USB, which worked fine, but didn't help with the sd card.

The firmware says:
Cannot initialise SD card 0: Card is unusableRepRapFirmware for Duet WiFi Version 1.18.1 dated 2017-04-09
Executing default.g (no configuration file found)…Error, not found

When booting without sd card it says
Cannot initialise SD card 0: Card not foundRepRapFirmware for Duet WiFi Version 1.18.1 dated 2017-04-09
Executing default.g (no configuration file found)...Error, not found

At least it detects if a card is present in the slot.

So i hooked up my oszilloscope to the pins of the sd card slot.
All pins show activity during boot, except for pin 2 (Data3).
I also tested the connection between the contacts in the sd card slot and the smd pads on the pcb with a fine wire.
Again, no connection on pin 2. So if the firmware accesses the sd card in 4-bit mode it is no wonder, that it is not happy with the data it gets.

Seems like my DuetWifi was delivered with a broken sd card slot. Probably its possible to exchange the slot, but i would rather not do this on a brand new board.
I suggest, we arrange a replacement of the board.

Regards,
Pascal