Fancy Filament sensor power draw



  • I recently got a filament sensor from TriangleLabs. It's not just a simple switch, as it has status leds and allows for chaining more sensors. I've got the m591 set correctly, as when I plug a simple endstop to the pins it changes Endstop3 Status on the DWC. The problem is when I'm using the fancy sensor (I don't need the lights or anything, i just got this one because I feel it rolls the filament waay easier than the other ones). The leds on the duet flash accordingly (when I insert or remove the filament from the sensor) but the status stays "YES" on the DWC. I noticed that the red led for this endstop on the duet is a bit dimmer than the other ones next to it when I have this sensor connected.
    Is it drawing too much current and messing up the readings? I've also tried with a shorter cable.


  • administrators

    @Andrer said in Fancy Filament sensor power draw:

    I noticed that the red led for this endstop on the duet is a bit dimmer than the other ones next to it when I have this sensor connected.

    Assuming you have connected the sensor to the endstop input correctly, that suggests that the sensor can't sink the current (about 1.5mA) that is needed to trigger the endstop input. Is the sensor definitely compatible with 3.3V electronics?

    You could try using one of the endstop inputs on CONN_LCD instead. Caution, these inputs have no protection against excessive input voltage. If the sensor has an open-collector or open-drain output, then use either an external pullup resistor, or a firmware version other than 2.04.



  • According to their own images, it should be 3v3 compatible
    alt text
    and quite simple to connect. What I find odd is that the leds on the duet are turning on and off when I test the sensor. but not the dwc. If i just add a regular endstop there it works perfectly. I'll try to test it further.


  • administrators

    @Andrer, the LED on the endstop input being dimmer than the others is the clue.

    Can you confirm that you have connected the Signal wire from the sensor to the STP pin on the Duet endstop connector?



  • Should be correct. i'm plugging it to E1 stop.

    alt text

    and the cable was crimped as follows.


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