Sending CommandsĪ more usable scenario could be to send commands to the Arduino. In this case we’re waiting for the \n character, which is the newline character that comes at the end of a string sent in the Arduino serial monitor. Here we’ve introduced the readStringUntil() function, which makes it possible to combine all the characters in the sent message into a single Arduino string. Serial.println("Nice to meet you, " + my_name + "!") If we send more than one character over serial with this code, the output will look like this:īut what if you want to send more than one character in handle it in a sensible way? No problemo! So when all the bytes of data are read and no new serial data have arrived, the buffer is empty and Serial.available() will return 0. Serial.read() returns the first (oldest) character in the buffer and removes that byte of data from the buffer. bytes of data) which have arrived in the serial buffer and that are ready to be read. Serial.available() returns the number of characters (i.e. There are two important functions related to the serial input in the code above, and that is Serial.available() and Serial.read(). Press the Send button or the Enter key on your keyboard to send. To send characters over serial from your computer to the Arduino just open the serial monitor and type something in the field next to the Send button. Using serial inputs is not much more complex than serial output. No matter what you decide to use it for, your system reaches a higher level of interactivity. Maybe you want to display text on an LCD display, punch in numbers to controll LEDs, control motor movement with arrow keys or send commands to decide which functions to call. The possibilites with serial inputs are endless. We have rarely written about serial input, however, which is what this post is about. It is also invaluable as a debugging tool. In almost every Arduino tutorial we’ve written we’ve used serial output for either printing text to terminal or plotting values.
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