Millis() and i2c interrupt issue

[Whandall]

@anon73444976

do you remember to take a copy of it with interrupts disabled
when you access it in non-interrupt context?

No, he did not.

@scolland

a volatile unsigned long variable named lastUpdateMillis which is set to the value of millis() every time the master requests a status update.

Then in the loop, i check for if((unsigned long)(millis()-lastUpdateMillis)>=2000){ and turn all outputs off.