Topics created by reFlexlab

What filesystem is the SD card formatted with now?

@reFlexlab No different to any other external stepper motor/driver combo

@reFlexlab I have some experience with these extruders. I would recommend swapping the motor out for a geared stepper (just to slow it down) and run it like a normal stepper motor in the system. There is a max allowable speed for these that must be adhered to.

@reflexlab it depends on your board:

If the board uses plug-in drivers then you can usually unplug the driver and connect an external driver to the step, direction and either 5V or ground pins of the driver socket. If it doesn't use plug-in drivers, and doesn't provide access to the step and direction outputs, then you would need a specialise driver that decodes the phase outputs of on-board driver to extract step and direction information from them. I have never come across such a driver, however in this thread https://forum.duet3d.com/topic/28887/weird-signal-from-duet-to-motor it became apparent that the person posting has such a driver.

The Duet3D MB6HC main board and the EXP3HC and EXP1HCL expansion boards can drive some types of Nema 34 motor directly at up to 6A peak current.

@fcwilt if the relay that @reFlexlab is using is similar to that one, then he needs to connect ot to one of the IO ports, not to an OUT port. The +5V and GND pins should be connected to +5V and GND on the IO port, and the control input to the OUT pin of the IO port.

The control signal will only be 3.3V, but this will probably be enough to operate the relay.

Alternatively, use a bare relay (not a relay board) connected directly to the chosen OUT port. The relay coil should be chosen to match the VIN voltage or 12V, whichever has been selected for that OUT port.

Checking as solved due to inactivity.

@reFlexlab said in 3.2.2 firmware - Endstop State Bug.:

M574 U1 S1 P"!io4.in"

Try turning on the pull-up resistor on your endstops by adding a "^" to your M574 configuration lines and let us know how that goes.

M574 U1 S1 P"!^io4.in"

@gcorthey As @dc42 said:

configure the extruder motor as both an extruder and an extra axis, so that you can command it like an axis with an endstop

eg

M584 X0 Y1 Z2 U3 E3 P3

This defines driver 3 as an axis (U) and as an extruder. You need to add values for U to M350, M92 M566, M203, M201 and M906. Probably best to copy the values for the U axis from the E axis. Add an M574 line for the endstop on the U axis, eg M574 U1 S1 P"io5.in" to config.g

When you need to use the U axis, send M584 P4 to show the U axis, home it, then hide it again with M584 P3.

It is probably better to start a new thread than resurrect a thread that is over 2 years old!

Ian

Hello Problem Solved

I have upgraded my Duet 3 to 3.2.2 firmware and everything is working as expected, Thanks for your help

Tom

@reFlexlab said in DUET 3 6HC - Using Inductive proximity sensor as endstop:

@fcwilt

Hello Thank you for your help,

How do I test that the logic levels are correct and how should I correct if they are not ?

Thank you,
Tom

I have an oscilloscope that I use but any device capable of measuring DC voltages in the 0 to 24 volt range would work.

Here is an example of the small low cost oscilloscopes available today. This one is half the cost of the older unit I have and five times as fast.

Oscilloscope

The OptoCoupler used is a 4N25 which is quite common.

The 1K resistor should be good for most inductive sensors IF they source current which is usually the case for PNP types of sensors.

NPN types of sensors usually sink current in which case the cathode end of L1 would connect to the sensor output and the J1 end of the resistor would connect to power source, labeled V1+ in the diagram above.

Yet I have found PNP and NPN types that both source and sink current.

I wish manufactures would stick to pure open-emitter (PNP) or open-collector (NPN) designs. Sigh... 😉

You can start with just R1 and L1 connected to sensor output and ground OR sensor power and output. If L1 goes on and off with the sensor then you have found the correct setup and can finish the wiring adding the 4N25, etc.

Frederick

@auré Please start a new thread with more details.

@nhof Actualy i didn't try this one. But I managed to do it on a Mac OS. Thanks

@reflexlab said in OpenResearch : Pressure Sensor for DuetWifi:

@bearer

Ok sorry, I wasn't aware of linear encoder for pneumatics.
I think your right, it's a great idea I will try to learn about step/dir interface 👍 .

I just want to point out something :

Today I am able to regulate the pressure of my pneumatic circuit for each syringe by controlling 2 supplementary Axis. (U and V)
By controlling the motors I am turning the knob on this type of pressure regulator : alt text

Thus changing the pressure.

So if I understood well, I have two/three options then :

Option 1 (Yours): Use the step/dir interface from the duet to know the position of the piston with a linear encoder and communicate from the duet to an Arduino circuit in order to regulate the pressure thus monitoring the piston position. (Have a PID loop with pressure output / Position input)

Option 2 (Mine) : Use an external Arduino circuit in order to read the pressure of each syringe and communicate to the Duetboard in order to control my U & V axis thus changing pressure.

Option 2 (Mix) : Use the duet to know the position of the piston with a linear encoder, read the pressure with an external Arduino circuit and use those 2 informations in order to control my U&V axis position on the duet to regulate pressure and thus piston position.

Why not use a stepper motor to control that valve and home it by stalling it at the fully closed position. Then you can use the stepper motor to open it any number of turns that you want. No need for a linear encoder.

Hello, I am coming back to this subject.

Maybe this is a simple question but I am trying to use the unused pin on the DUET wifi.

I plan to use the M670 command, in order to successively control output ports during moving..

They are area of shadow in the use of the M670 command.

For exemple if I want to trigger two output ports : 20 and 22 which are fan output pins (chosen with this help) :

I want pin 20 off and pin 22 on during the moove I will send this command :

M670 P20:22
G1 P0:1 X... Y... Z...

Is it correct. Thank you

reFlexlab