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Understanding why should avoid “String” and alternative solutions

Which is the most efficient and fastest solution to read and store the data from Accelerometer and GPS? You don't state how fast is fast enough nore how long you want to record the data for. ...
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Enable full float-capable snprintf() library with PlatformIO

I finally found the answer at When using PlatformIO, add the following line to platformio.ini to enable full support for floats to printf(): build_flags = -Wl,-u,...
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