Write data to the file.

file.write(data)
file.write(buf, len)

file: an instance of the File class (returned by SD.open())

data: the byte, char, or string (char *) to write

buf: an array of characters or bytes

len: the number of elements in buf

byte
write() will return the number of bytes written, though reading that number is optional

• print()
• println()
• read()

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