Thanks, Mr. Gusse, for support !
I have only one PCB, without the resistors from chain (just R2=1k is soldered on PCB, between +5V and ADC_IN).
I put the resistors from chain 1 from R2/ADC_IN to ground ; in first case works perfect.
Then I soldered the R9=100k from R2/ADC_IN to ground ; I put resistors from chain 2 into circuit (in parallel with R9). In this case nothing happens.
All the resistors are measured, look to be OK (this was my first concern too ...).
Tomorrow I'm going to try to set some debounce ...




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