end of filament detection

[rr2s]

I would like to implement a function that would put marlin break at the detection end of the filament. I would really contributed to this framework and understand how to do it properly.

Where and how can I create a function that triggers a pause if the pin D1 and high state (normally unused pin on the ramps 1.4).

[gerty]

Has any progress been made on this feature? We're looking to repurpose an unused endstop and a roller/limit switch which would trigger an M226 "Gcode Initiated Pause" when open. D1 is a good thought but we're using an Azteeg X3. I'll have to check the mapping.

[rr2s]

I wanted have advice, but I have not had any. I fend me. I use a optical detector fork. Command M226 is trigger when there no more filament. In ramps 1.4 we can use the AUX (D1 for example). Azteeg X3 also uses a Atmel ATMEGA2560 micro controller, you should find the auxiliary fairly easily. I also use a buzzer to warn me when there lack of filament M300.   It's very simple to set up.

[boelle]

if you have fixed this then please fork the latest marlin, make the changes you made and submit a pull request

[JamesT42]

If you do, please make it multi-extruder compatible

[AbuMaia]

I see there is now an option to enable a filament runout sensor in configuration.h. Where can I find documentation on this feature? I have such a switch already in use on my printer, set to normally-open, and held closed by the filament, triggering M300 when the filament end opens the switch.

[thinkyhead]

Hi @AbuMaia. All you need to do is to uncomment the define FILAMENT_SENSOR and then make sure your sensor's pin is set correctly. The default values are…

[boelle]

info here: http://www.thingiverse.com/thing:89044

and you can get one here: http://owi.storenvy.com/

[AbuMaia]

That's the wrong sensor, Thinkyhead. I'm not talking about a filament width sensor, but an end-of-filament sensor. Configuration.h says it uses RAMPS servo pin 2, but there are options for pullups and inverting which I do not understand.

[boelle]

you can still use that sensor... if a 3mm filament is below 1mm then you are prob out

Den tirsdag den 24. marts 2015 skrev AbuMaia notifications@github.com:

That's the wrong sensor, Thinkyhead. I'm not talking about a filament width sensor, but an end-of-filament sensor. Configuration.h says it uses RAMPS servo pin 2, but there are options for pullups and inverting which I do not understand.

— Reply to this email directly or view it on GitHub https://github.com/MarlinFirmware/Marlin/issues/999#issuecomment-85455575 .

[AnHardt]

@boelle Yes. But there is a little difference between 60$ and 20€ cent.

[AbuMaia]

As mentioned earlier, I don't have a width sensor, I have a filament runout sensor. I just need some additional info on how to set it up in Configuration.h.

[Wurstnase]

If you have a normal mechanical switch you need a pullup, so the pin can reset. Inverting depends on your switch (normally close/normally open).

[AnHardt]

@AbuMaia Take a switch. Connect to pin and ground. Set FILRUNOUTPIN in your pins???.h. Define ENDSTOPPULLUP_FIL_RUNOUT. Play with FIL_RUNOUT_INVERTING until it works.

[AbuMaia]

I have my switch connected to pin 57. Is there a pullup resistor associated with that pin?

[AnHardt]

@AbuMaia As fa i remember there are pullups for all pins.

[AbuMaia]

Thanks for the help.

[thinkyhead]

Oops, right, well, same general idea. Find the relevant pin, make sure it's set, enable the option. Etc.

[Ziggy2013]

Most of the functionality required for a filament "end" monitor and alarm are already in Marlin. The existing "filament Change" function (pause/resume) can be used if triggered by a digital pin going low to high. A simple filament end sensor can be made just using a micro switch which normally holds the pin low when filament is present.

http://community.robo3d.com/index.php?threads/filament-monitor.3335/page-2#post-42914

The mods below have been tested and work. The end of filament sense pin is 44. Obviously this pin needs to be a config parameter. The boolean FC_Flag also needs to be defined correctly (not just in line as in this mod)

The code changes required in the file marlin_main.cpp are :

  lcd_init();
  _delay_ms(1000);  // wait 1sec to display the splash screen

  #if defined(CONTROLLERFAN_PIN) && CONTROLLERFAN_PIN > -1
    SET_OUTPUT(CONTROLLERFAN_PIN); //Set pin used for driver cooling fan
  #endif

  #ifdef DIGIPOT_I2C
    digipot_i2c_init();
  #endif

  // filament monitor mod - 18/03/2015
  // filament monitor pin set to input
   SET_INPUT(44);
   WRITE(44,HIGH); // enable pull up 
}

// filament monitor mod - 18/03/2015
boolean FC_Flag = false; // initialise flag to enque M600 command once per alarm

void loop()
{
  if(buflen < (BUFSIZE-1))
    get_command();

And in the marlin_main.cpp loop() code

    #else
      process_commands();
    #endif //SDSUPPORT
    buflen = (buflen-1);
    bufindr = (bufindr + 1)%BUFSIZE;

// filament monitor mod - Ziggy 
// 
// note FC_Flag variable must be global
//
 if (digitalRead(44) == HIGH) {         // check filament monitor alarm pin
    if (!FC_Flag) {              // not already triggered ?
     enquecommand_P(PSTR("M600"));       // trigger a filament change
     FC_Flag = true;                     // 
    }
  } else FC_Flag = false;               // reset for next alarm

  }
  //check heater every n milliseconds

[Ziggy2013]

I see in the latest dev version this function has been implemented along the same lines using pin 4

[thinkyhead]

Sounds like you have it in hand. I can see it will help to make better documentation for this, and for Marlin features generally. Keeping that in mind…

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