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When you're working with serial communication, you don't always need to send a number with your data; you can send a bit pattern instead. For example, you can use 7-bit ASCII to communicate with the Arduino using just a handful of characters:
If you want to send more than a byte, you need to send an integer. You can send a number any way you'd like. In this example, you could send the number of characters in the message. (Be sure to include a space between the number of characters and the bytes of data that make up the message.)
In the actual code, your message would be contained in an array. There are two techniques for parsing this array when you receive it:
You can use a for loop to read the bytes and display them to the Serial Monitor; for the full list of serial commands, see Recipe 1.4.
You can use the serialEvent() function to have Arduino do the work of parsing the bytes for you.
This example uses a for loop to display the message in the Serial Monitor. The Arduino sends a long string of bytes. You receive these bytes, and the for loop displays each byte as a single character.
At the end of your program, you can print a message to the Serial Monitor by calling the Serial.print() function (see Figure 4-5). If you print a message to the Serial Monitor, it is sent at the speed of the port, which may not be the speed you want. If you are using a software serial library, then you can use the Serial.write() function to send your message.
The digitalWrite() function takes three arguments: (1) the pin being sent to, (2) a value, and (3) a boolean to indicate whether you want the pin to be in output (logic 1) or input (logic 0) mode. The pin is an 8-bit number; the value can be 0 or 1.
The Processing Serial Port line of code declares a variable called mySerial. This variable will refer to the Serial object in the serial port library. The code is in the same sketch as the previous example. This example differs from the previous one in that it doesn't print anything to the screen or anything on the processing serial port. The serial port is emulated by the library. Figure 4-3 shows the results of the this sketch. If you want to learn more about how the serial port library works, I recommend a book on the topic or the link below: Serial Communication in Arduino . 827ec27edc