Printer Model: self made
MCU / Printerboard: BTT Octopus Pro
Host / SBC raspi4
klippy.log
klippy.log (137.4 KB)
Hi,
I tried to use gpio26 as input pin (ERCF extruder sensor) but its triggered regardless the status of the switch.
Defined as:
switch_pin: ^!SHT36:gpio26
But Pin is 0V without anything connected so the pullup seems not to work.
Same definition works with gpio20, second SHT36 board same effect.
Greetings
GPIO26 → RGB
It seems to have a pull-down on the schematics.
So, it is expected that external pull-up/pull-down is more powerful than the built-in.
You cannot use gpio26 as an input - as @nefelim4ag shows in the diagrams, the pin is connected to the input of the '541 buffer.
You can’t sense anything anything on that pin without reworking the board and running a wire to the pin.
Sorry.
Ummm yes. Sorry. I often misuse pins but in case of RGB and the 3,3v to 5 volt buffer it really makes no sense and can’t work.
Thanks a lot to both of you !
