Programming Reference/Librarys
Question & Answer
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An unsigned data type that occupies 1 byte of memory. Same as the byte datatype.
The unsigned char datatype encodes numbers from 0 to 255.
For consistency of Arduino programming style, the byte
data type is to be preferred.
[=unsigned char myChar = 240;=]
*byte *int *Arrays *Serial.println
Source: arduino.cc