I learned many years ago during a Pinewood Derby (Scouts) that no one is overly concerned with absolute accuracy, as long as everyone is timed using the same clock. @Paul_KD7HB, make sure to wire the connections—don’t rely on radio signals since all kinds of interference can cause issues. Also, have a redundant system in place; one will likely fail at some point.
Keep this in mind:
Arduinos are designed for experimentation and learning, often used with breadboards and loose wires, which can become unreliable if vibrated. They are not built for harsh, dirty, or electrically noisy environments commonly found in industrial, automotive, or other commercial applications, making them unsuitable for such settings.
To ensure we can provide the most accurate assistance, please include detailed information about your setup. Specify the exact board, shield, wiring configuration, and power sources you are using. An annotated schematic is ideal, as it provides a clear overview of your setup, but be sure to also include links to the technical specifications of your hardware components.
Before posting your code, please review the forum guidelines and use code tags for better readability. Also, provide links to the technical information about your hardware, and include a preliminary schematic that shows all power, ground, and connections. For additional guidance, you can refer to this link: Useful Links and Tutorials. Note that in this context, breadboard diagrams are not considered proper schematics.