Use 5v from diffrent source for optical endstops? on duetwifi



  • So im on the edge of being done with my Hypercube evo and just the wiring and config left.
    started to read about endstops and what i understand it´s not possible to run the optical endstops direct on the 3.3v line and u needed to resolder the resistors on the endstops to get the to work. is it possible to just grab a 5v line from somewere on the duetwifi to dont have te resolder 6 endstops.?


  • administrators

    Yes, you can get +5V from either pin 1 of the expansion connector or from the PanelDue connector. However, only the endstop connection that provides power to the LED side of the slotted options switch should be powered from 5V. If the same wire also powers the output side, then do not use 5V.

    Some types of opto endstop do work correctly with a 3.3V supply.



  • ahh okey. then i´ll try without mods and if it does not work i replace the resistors.
    thanks for quick replay 🙂



  • I have the common variety running on 3.3v.just make sure your flags are black and fill the slots in the endstop as much as you can without risking a collision.

    The endstop lights on the duet board are a good guide. If they don't go out completely when the endstop is triggered you are not sending a strong enough signal. They are anogue in that sense.



  • @dc42
    Unfortunately, I have the same issue, but both PanelDue and expansion connector are already in use (Duet 2 Wifi V1.03) . And apparently, my sensors are not 3.3V compatible ☹

    However, only the endstop connection that provides power to the LED side of the slotted options switch should be powered from 5V. If the same wire also powers the output side, then do not use 5V.

    I cannot quite follow your instructions and don't want to destroy my Duet Wifi....Can you elaborate what options I have - except switching to 3.3V sensors? Can I use a resistor, if so can you point me to the right setup?

    Thank you in advance dc42. I just love the flexibility of your firmware, there's no way going back to Marlin / Repetier now - even tho I liked to use them too.

    PS: I hope in V3 of Duet, there will be a jumper to select endstop logic level....


  • administrators

    @googliola said in Use 5v from diffrent source for optical endstops? on duetwifi:

    However, only the endstop connection that provides power to the LED side of the slotted options switch should be powered from 5V. If the same wire also powers the output side, then do not use 5V.

    What that means is that if your endstop has a 3-wire connection, then you shouldn't power it from 5V because we can't guarantee that the endstop inputs will tolerate 5V. However, that doesn't apply to the Duet Maestro or the revision 1.04 Duet WiFi/Ethernet, because they have endstop inputs that can definitely tolerate 5V.

    The simplest option may be to change the resistor on the endstops. Can you provide some close-up photos of them?

    Regarding Duet 3, we are looking at providing both 5V and 3.3V power on at least some of the endstop connectors. We won't be using 3-pin connectors with switchable 5V/3.3V power because that make sit tooi likely that users will blow up 3.3v devices (e.g. filament monitors) by giving them 5V power.

    Electronics has mostly switched to 3.3v operation now, but unfortunately a lot of 3D printing is stuck in the stone age with 8-bit 5V electronics.



  • What that means is that if your endstop has a 3-wire connection, then you shouldn't power it from 5V because we can't guarantee that the endstop inputs will tolerate 5V.
    Understood, thanks for the clarification.

    The simplest option may be to change the resistor on the endstops. Can you provide some close-up photos of them?

    I turned out that I wired the simple microswitch endstops the wrong way 🙄
    But not all issues solved. I don't know if its related to logic level or not. Maybe you can help. This is the touch plate I am trying to setup:
    alt text
    The LED on the Duet Z-Axis endstop is fully lit, and when I close the circuit the blue LED on the sensor lights up, but the Duet LED status does not change. All 3 connections are wired. Unfortunately, there are no specs available (was sent to me by routakit) and I have no idea how to proceed.....in config.g I have setup the probe with M574 Z0 S2

    Unrelated question: is there a gcode to test for the status of filament runout sensors (configured with M591)?

    One more for the Duet V3 wishlist: As stated here C5 thru C9 (the endstop inputs on the DueX) cannot be used for filament monitors, but C10 and C11
    Is that correct? Even if a simple microswitch were to be installed for sensing? Renders 3 drivers of the DueX5 pretty much useless to my setup...

    By the way: your response time is just mind-blowing. Have you been waiting for my post?? ☺


  • administrators

    @googliola said in Use 5v from diffrent source for optical endstops? on duetwifi:

    The LED on the Duet Z-Axis endstop is fully lit, and when I close the circuit the blue LED on the sensor lights up, but the Duet LED status does not change. All 3 connections are wired. Unfortunately, there are no specs available (was sent to me by routakit) and I have no idea how to proceed.....in config.g I have setup the probe with M574 Z0 S2

    It's difficult if you have no data for the probe. It might work if you use it as a Z probe instead, connected to the Z probe input, with P5 or P8 in the M558 command. Check the Z probe reading in DWC to see whether the firmware is reading the output.

    Unrelated question: is there a gcode to test for the status of filament runout sensors (configured with M591)?

    Yes, M591 D# where # is the extruder drive number.

    One more for the Duet V3 wishlist: As stated here C5 thru C9 (the endstop inputs on the DueX) cannot be used for filament monitors, but C10 and C11
    Is that correct? Even if a simple microswitch were to be installed for sensing? Renders 3 drivers of the DueX5 pretty much useless to my setup...

    They should be OK for simple microswitch sensing.



  • Hello,

    I know it's a old post, but I didn't want to create a new one just for 1 question.

    I have adapted a Duet2Wifi v1.04 on ATOM 2.5EX Delta printer, and I have a question about optical limit sensor.
    The sensors are OMRON trade parts and were connected on +5v on the old board.
    The sensor didn't work with +3.3v on the duet, then I need to go to +5v external power

    My question is simple, can I just connect the signal pin on the Duet and no connection for the +3.3v and ground pin or need I connect signal pin + ground pin on the duet board.
    I would like to connect +5v and ground on the adapter below and just the sensor signal pin to the duet board.
    Is it possible ?

    alt text

    Thanks for your support.



  • @StAnZ-007 said in Use 5v from diffrent source for optical endstops? on duetwifi:

    I would like to connect +5v and ground on the adapter below and just the sensor signal pin to the duet board.
    Is it possible ?

    you'd need to ensure the output- is connected to ground on the duet. usually input- and output- are the same, so if you feed it Vin from the duet that should be okay. then verify the duet inputs are okay with the signal level, no idea of they active high or low, or if the duet can take 5v on all inputs.



  • @bearer said in Use 5v from diffrent source for optical endstops? on duetwifi:

    you'd need to ensure the output- is connected to ground on the duet. usually input- and output- are the same, so if you feed it Vin from the duet that should be okay. then verify the duet inputs are okay with the signal level, no idea of they active high or low, or if the duet can take 5v on all inputs.

    The sensor are active high.
    If I found good information here, duet board v1.04 can accept +5v on sensor inputs



  • then make sure you have a common ground and you'll be golden with your plan


  • administrators

    @StAnZ-007 said in Use 5v from diffrent source for optical endstops? on duetwifi:

    Hello,

    I know it's a old post, but I didn't want to create a new one just for 1 question.

    I have adapted a Duet2Wifi v1.04 on ATOM 2.5EX Delta printer, and I have a question about optical limit sensor.
    The sensors are OMRON trade parts and were connected on +5v on the old board.
    The sensor didn't work with +3.3v on the duet, then I need to go to +5v external power

    My question is simple, can I just connect the signal pin on the Duet and no connection for the +3.3v and ground pin or need I connect signal pin + ground pin on the duet board.
    I would like to connect +5v and ground on the adapter below and just the sensor signal pin to the duet board.
    Is it possible ?

    alt text

    Thanks for your support.

    Thar adaptor is overkill. You can get +5V from either the PanelDue connector or from the expansion connector. And yes, the Duet WiFi/Ethernet rev 1.04 tolerates 5V on the endstop inputs.



  • @dc42 said in Use 5v from diffrent source for optical endstops? on duetwifi:

    e connector or from the expansion connector.

    OK, if I use the +5v from pin 1, can I give the power to 5 sensors at the same time on the Pin 1 alone ?


  • administrators

    @StAnZ-007 said in Use 5v from diffrent source for optical endstops? on duetwifi:

    @dc42 said in Use 5v from diffrent source for optical endstops? on duetwifi:

    e connector or from the expansion connector.

    OK, if I use the +5v from pin 1, can I give the power to 5 sensors at the same time on the Pin 1 alone ?

    Yes.



  • @dc42 said in Use 5v from diffrent source for optical endstops? on duetwifi:

    Yes.

    Thanks for your fast answer.



  • So last question,

    • Can I connect all my 5v sensor pin to the expansion pin 1 ? => OK, it's clear for me
    • Then can I connect all my ground sensor pin to the expansion pin 2 ?
    • Then can I connect only signal to X Stop / Y stop / Z stop / E1 ans E2 stop ?

    Possible or not ?

    Thanks


  • administrators

    Yes, that's workable.



  • Nice, thanks



  • Hi all,

    I also have problems with the optical endstops. The board I have is the Duet2Wifi v1.04 and the endstops are TCST2103 5v optical sensors (https://www.vishay.com/docs/81147/tcst2103.pdf).

    VCC is connected to 5v Powersupply
    GND to GND on the endstop-pin on the Board
    SIG to STP/IN on the endstop-pin on the Board

    The endstops are in the config.g File set to Active-High (M574 X2 Y2 Z2 S1).

    If the sensors are triggered, the endstop LEDs on the board go out. But nothing happens in web control -> it shows all sensors are triggered.
    No i have measured the sensor signals:
    If the sensor is triggered, the output is 4.3v
    If the sensor is not triggered, the output is 1.5v, and not 0v or GND...

    Have I missed something or are my sensors just crap?

    Thanks for Help.


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