BLtouch randomly decides to not work today

deltajegga

@DIY-O-Sphere so that would make sense that the duex e2 heater led is on, but i wonder why 3 and 4 are on.

DIY-O-Sphere

@deltajegga
You are shure you haven't updated firmware? On some releases you had to free up the heater channels for use with the BLtouch.

deltajegga

yep, ive been printing smoothly since may.

DIY-O-Sphere

@deltajegga
Maybe the jumper?
https://forum.duet3d.com/topic/10654/bl-touch-and-the-duex-5/64
Also read the first post. For me that sounds similar...

deltajegga

@dc42 do you know the pulse length for the pwm signal to depoly and retract the probe on PWM1 on duex? i have an oscilloscope i can hook up. it seems as its not sending the signal anymore. and also is it supposed to be 3.3v or 2.5v? and does it go high or low to deploy the probe?

deltajegga

@DIY-O-Sphere the jumper is for the 5v power to the probe, that is fine.

DIY-O-Sphere

@deltajegga said in BLtouch randomly decides to not work today:

pulse length

Found in the manual of Bltouch.

deltajegga

@DIY-O-Sphere nice, time for some testing

deltajegga

https://1drv.ms/u/s!AownqdAPfMHChSphxDFBpofoon-5?e=0gebgh
video of scope, i press deploy probe at about 17 seconds and retract at 23 seconds. it keeps flickering like this untill i turn off the printer. this was with no wires attached to plug, just the leads for the scope
i thought i would have to record it and go back to look for a single 650ms pulse, but it seems to keep going? does it keep trying untill it sees a change in the hall sensor wires?
the pulse lengths seem good, but it seems very noisy.

deltajegga

UPDATE
i saw that the leds are on for e2 through e4 heaters on the duex. i dont remember them ever being on. so i decided to try e6heat on PWM5 and it works!!!

does anyone have any idea how the pwm could fail like that? i see the heater 5 led is on now, but not full brightness like the others.

deltajegga

i would really like to know if i should be worried about the other PWM channels. has this happened before?

deltajegga

@Phaedrux do you have any idea why the first two pwm channels failed?

Phaedrux

I'm not sure about that. Perhaps @dc42 would have a better idea.