Understanding data types is especially important if you wish to use serial communication to send data to your Arduino and have the ATmega328 act on this data. Serial data is read from the serial buffer using a sequence of commands like this.
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It is important to know that characters typed into the serial terminal (or sent from on Arduino to another via serial) are interpreted as ASCII (American Standard Code for Information Interchange) characters and encoded with the decimal number corresponding to the character on the ASCII table. The following is the ASCII table from lookuptables.com, a great source of all sorts of computer-related reference tables.
To give you an example, if you were to send the letter A to an Arduino via serial and saved the incoming byte as myByte using code like that given above, the numerical decimal value of myByte would be 65. Try the following code and enter A in the serial terminal and you will notice that the number 65 is returned to the terminal and output to the screen because the Serial.print() function by default prints the decimal value of the byte.
If you want to instead print the ASCII character corresponding to myByte, use the Serial.write() function instead. You can also use an additional argument to tell the Serial.print() function to display the byte using the decimal, hexadecimal, octadecimal, or binary base numeral systems. The following code will take a byte read in from the serial terminal and print it to the terminal using these various bases.
Assignment
Use the String class (you can think of this as a data type called a string) to modify the code above to read in a sequence of characters and save these characters as a string then print this string to the terminal. To help you out, know that strings are defined as follows and are surrounded by quotation marks.
A character can be concatenated to the end of a string using the following command.
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To ensure that a byte read in from the serial buffer is interpreted as a character, precede a call to this character with the (char) command, which converts a number to the corresponding ASCII character.
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Good luck.