Inductive sensor - Z probe returning wrong measurements
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I have reverted back the firmware to an olden working version. But it dint make any difference.
In DWC the older board shows voltage value as 24.5 and the new one shows 24V . Is this difference of any significance ?
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After struggling a lot.
I decided to change the board with my old one. With same settings and same equipment, now i get perfect values.
I think the problem is with duet board, the z probe pin might me floating more than required.
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That's a PNP-output inductive sensor, and it needs a voltage divider on the output to connect it safely to a Duet 1.03 or earlier, or at least a pulldown resistor to ground when connected to a version 1.04 Duet. See https://duet3d.dozuki.com/Wiki/Connecting_a_Z_probe#Section_PNP_output_normally_open_inductive_or_capacitive_sensor.
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Yes. I have followed that page and made the connections similarly. The signal is driven to ground and enable port. There is a resistor that pulls down the signal. I found the problem to be with the duet board because of two reasons.
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The E0 driver was not working and always giving me an current error on DWC and had to change the driver with Y driver.
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The same machine and software setup works perfectly fine with another duet board, but with this board it produces wrong measurements.
Can i claim for a return or exchange for this faulty board ?
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If the E0 driver is not working and the board is within warranty then you can claim a warranty replacement. However, I suspect that the problem with the Z probe may be because the pulldown resistor has too high a value or is not connected properly. If it is a 1.04 revision board, then there is an extra protection diode in the circuit, and the small amount of leakage current from that means that the Z probe input will tend to float high if the pulldown resistor is not present or has a very high value. But please mention the Z probe issue in your warranty claim anyway, to make sure that it gets tested too when we repair the board.
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Maybe it can be with the resistor because i was not aware of this change of electronics. As the new board is a month old and the other board is around 8 months old.
I have ordered two new boards. So i shall try and figure out with the new board, if it persists.
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Panel due is not able to read the sd card. I have done all the connections as per the duet documentation and used the two way wire.
I ordered duet wifi, panel due i7 and expansion header all together. But now i find that only the expansion header seems to work good. Initially duet wifi extruder driver failed and then later the Z probe pin on duet and now panel due seems to be giving trouble.
When i try to work with external sd card it shows only one thing.
"Error: 1 accessing SD card"
Even in DWC i am not able to access the SD card. - "Cannot initialise SD card1 : card is unusable"
What could be the possible problem ?I was a happy customer of duet with good experience from my last two boards. Being a programmer myself i respect the amount of work being put in to make such a good product. But this particular order seems to be ruining.
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As I said before, the faulty E0 driver is sufficient for you to claim a warranty replacement for your Duet, assuming it is a genuine UK-manufactured one purchased from us or from one of our distributors. See https://www.duet3d.com/warranty.
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Thanks for the reply @dc42 .
Maybe a bit of miscommunication, but its more about understanding the fault than about the warranty.
I dont understand the problem with panel Due right now. Its a I7 brand new one directly from duet3d UK website.
But the panel due is not able to read the micro sd card. What could be the possible reason ? Am i missing any connection ? i think there is nothing much from user end because its all straight forward, just connecting the two way wire and power pins.
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In order to use the SD card on PanelDue, you need to use the ribbon cable connector on PanelDue to connect it to CONN_SD on the Duet, instead of using the 4-way connector.
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yeah. I have used the ribbon cable and connected as per the documentation.
From the panel due 'connect SD' to the duet 'Connect SD'.Is the panel due i7 compatible with duet Ethernet 1.0 electronics and firmware version 1.19 ?
I tried with new board and 2.04 firmware too but it was not successful. -
All Duet Ethernet boards shipped from the factory are PCB revision 1.02 or later. If yours really is a 1.0 then it must have been converted from a Duet WiFi.
Duet PCB revisions 1.0 and 1.01 do not provide the UTXD and URXD signals on the CONN_SD connector, so they need the 4-way cable as well as the ribbon cable. Without it they will remain in the "Connecting" state.
How long is the ribbon cable? The length needs to be limited to about 300mm to avoid signal degredation.
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Both 4 way cable and ribbon cable are connected. I double checked the connections, they are as per the documentation.
The length is also less than 250 mm because i read that maximum of 400 mm can only be used.
I think the panel due is not able to read or detect the memory card. I ran the firmware diagnostics also and it reports only one memory card i.e the one in duet.
And the panel due throws an error "Error: 1 accessing SD card" . I tried with different memory cards but it still shows the same error.
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If you send M21 P1 from either PanelDue or from DWC, what is the response?
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"Cannot initialise SD card1 : card is unusable"
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Do you have anything connected to the temperature daughter board connector? Do you have a DueX expansion board connected?
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No. I did not use any of them. I have a duet Ethernet and expansion header for the drivers. Thats it.
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Please try it without the expansion board ribbon cable connected to the Duet, in case of a problem with the cable or the expansion breakout board.
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I tried and it did not work.
I got a new TFT panel display same one and the sd card works fine. So i think its the problem with sd card port in the previous panel.
Thanks for the swift response and support!
