The milis collide if the values are the same

[PerryBebbington]

This is such a common question on here several people got together and wrote a tutorial all about blinking multiple LEDs with millis()

Flashing multiple LEDs at the same time

Introduction A common question is to ask how to flash 2 (or more) LEDs at the same time. Typically the person asking will be using delay and will be experiencing the main problem with delay: it blocks and stops anything else from happening. This tutorial contains several different approaches to the problem of flashing 2 or more LEDs at the same time with independent timing for each LED. The basic principles for each can all be adapted for other situations requiring multiple timers working inde…

Millis() cannot 'collide' in any way.