Help me achieving this effect through pinout

[blh64]

@xawwnee

int chCount = sizeof(nanoPin) / sizeof(int);

Better written as

const int chCount = sizeof(nanoPin) / sizeof(nanoPin[0]);

@xawwnee

for (int op; op < chCount; op++) {

Need to initialize op. There is no guarantee is will be zero to begin with

for (int op=0; op < chCount; op++) {

@xawwnee

for(int pin = chCount; pin >= 0; pin--)

You are going out of bounds. You access array elements from 0..chCount-1
You do this multiple places...