SD card data acquisition

Projects General Guidance
12

R1c4rd:

    for (; millis() < startTime + 2000UL;)

[...]
    for (; millis() < startTime + 7000UL;)

Change this to:

    for (millis() - startTime < 2000UL)
[...]
    for (millis() - startTime < 7000UL)

This way overflows are handled transparently (thanks to this being unsigned integers). Your code may get stuck after about 49 days, when millis() overflows.