DuetWifi 1.0.1 and BL Touch Smart 3.0 - how to force 3.3V logic?

[dc42]

@jinx, I'm glad you solved it.

[Nuffe]

Coming back to my old topic. Kinda like a summary.

I never got Smart 3.0 to work with my KosselXL, and eventually purchased smart effector. It is working perfectly and I am happy with it. I have quite old Duet Wifi board on that machine.

At the same time I also purchased 1.04c version of DuetWifi, and I am now installing that to my AM8. I started to be desperate, when the same problems again started. I originally though my board is too old and would require more tinkering with pull-up resistors etc, hence new 1.04 board. I had still possibility for wiring errors, but remembered that I have an another BLTouch. It was version 2.0. It works, at least self test etc is working ok. The same configuration and the same wiring does not work with BLTouch Smart 3.0. Maybe it is in incorrect logic mode or something.

So - eventually this topic is mystery for me. I am currently hoping that Smart 3.0 works better with SKR 1.3 I have in my Tronxy x5s, but lets see.

[jnofsinger]

Hello Nuffe or anyone else!

Did you ever need to force 3.3v or use a pull resistor to make the BL Touch 3.1 work at all? I understand it didn't ultimately work for you, but I am in the same boat with an older duet 1.0.1 board.

I would like to play around with a BL Touch on a Frankenstein Ender3/Duet Wifi 1.0.1. The configuration and wiring seem pretty straightforward and was just wondering if the BL voltage on the older board was going to be a problem.

Thanks,
Jim

[dc42]

The current BLTouch models should work OK with Duets (and other users seem to get them working), but if you use them connected to the Duet 2 or Duet Maestro Z probe input and you are using RRF3, then you must enable the pullup resistor in the M558 command.