Help with CNC 3018 from Banggood

[Kitwn]

Doddy,
We're obviously both talking at once!

Re the use of capacitors, the time constant for a .47uF cap and a typical 10K pull-up resistor is 0.47 mS, so a delay of about 1mS will result when the switch opens. Less if the smaller values of resistor are used. The delay when the switch closes depends on the resistance of the switch and the wiring to ground but will only be microseconds. I use 1uF capacitors on the inputs to my traditional cheap Chinese parallel break-out board without any obvious issues with delays and no noise-related false triggering.

Edit: Just seen your latest post (16) and agree completely. External resistors and noise filtering are a must.