@felmue yes, there are 10k resistors built in into encoder unit i tried with and without them. No good readings.

@teastain Hi, encoder is omron E6B2-CWZ6C 2000P/R 5-24v , channels a b z are connected to u161 ext-encoder with 10k ressistors. I tried with and without resistors , also i tried 4.7k.
pull up ressistors are between channels and +5v.
M5stickc is powered by usb.I am using uiflow blocks.
iam trying to measure a lenght of material, it shows a counter values and meter value , but i have to rotate a shaft very very slowly.When i spin a little faster it just stop counting and show same value.

@earla Hello, did you solve that problem with ext_encoder? Iam having same issue with omron encoder , its 2000rpr resolution with A B and Z channels. Iam gettig any readings only if iam spinning it very slowly.