@infiniteloop I did as you suggested and the sensor will now detect the motion of the filament. When queried the probe responds with: Duet3D rotating magnet filament monitor v3 on pin e1stop, enabled, sensitivity 24.80mm/rev, allow 70% to 130%, check every 3.0mm, version 3, mag 133 agc 66, measured sensitivity 23.04mm/rev, min 87% max 107% over 27.4mm. This was obviously a very tiny print, it did pause at one point and reported an overfeed issue. I didn't expect that!

Thanks very much for your help. I'm certain I wouldn't have figured it out on my own.
Carroll

@infiniteloop The alternating green and red pattern that I see is occurring at a rate of about 110 flashes per minute. So, I'm not sure I would see the other pulses. Also, I disconnected the board and distanced it from the sensor. When I powered it up I got the correct 6 red flashes that indicates no magnet sensed. I did check to see if the metal shaft rotated as you suggested and it does not.

Thanks,
Carroll

@alankilian I had resistance checked the cable before installation, but I'm always suspect of the connection on those tiny wires, so I checked them again. They were OK, but I tried another set of wires just to be sure, but the error remains. I did try both E0 and E1 connections while making sure the configuration was correct but neither worked. I did notice that the limit led on the board was flickering synchronously with the led on the filament sensor. I took a look at the board for cold solder joints, etc. but nothing stood out. any other ideas?

Thanks for the quick response,
Carroll

I just installed a magnetic sensor, pcb ver 1.7b.

configured with; M591 D0 P3 C"e0_stop" S1 R70:130 L24.8 E3.0 in config.g file.

Upon powering up the green led flashes 3 times, but then continuously emits a pattern of a single green flash followed by a single red flash.

if I issue a M591 D0 command the response is: Duet3D rotating magnet filament monitor v1 on pin e0stop, enabled, sensitivity 24.80mm/rev, allow 70% to 130%, check every 3.0mm, no data received

I have a Duet2wifi board running Firmware: RepRapFirmware for Duet 2 WiFi/Ethernet 3.3 (2021-06-15)

What advice can you give me to resolve this?

Thanks,
Carroll