Strange float behaviour on Arduino Mega

[robtillaart]

@bojan_jurca

I guess this may be caused because hardware internally always calculates with 8 bytes double.

As explained in post #6 above.

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For printing the float numbers, you might want to use my printHelpers library:

• GitHub - RobTillaart/printHelpers: Arduino library to help formatting data for printing

The standard Arduino printing of floats only prints if its value fits in an uint32_t (4.294.967.295). Above that it will print ovf for overflow.
The printHelpers library supports the printing in scientific format e.g. 3.897E12 to solve this artificial limit.