So, whether or not you use interrupts to access that data then becomes irrelevant. Is this an RFID security system? A fish-tank feeder? A moon rocket? It might be, for example, that serial data is not the best way of solving this problem. I have also designed a Proteus simulation which you can download from the below button, and I have explained this simulation in the last step of this tutorial: Download Simulation & Code. Perhaps, like a lot of other low-level questions we have seen recently, if we moved away from what you think you need (handling serial interrupts) to what real-world problem you are trying to solve. Arduino Serial read command is used for reading any data available at the Serial Port of Arduino board. So the loop function, by checking Serial.available () is effectively checking if a "message" (serial data) is available, at a time when it can be processed in an orderly way. Please ensure you have the Serial Monitor set to send a Newline Only. The data is correctly received, but it doesn't represent ASCII characters. That is the reason, that you get weird characters with the correct baudrate. The Serial Monitor for example expects ASCII encoded text. Use the Serial Monitor to send the 1000100100110101 data. On the PC: Here it is important how you are reading the serial data on the PC. Even in advanced operating systems like Windows or OS/X, low-level hardware interrupts actually only usually put things into a queue (a message queue) which are pulled out in an orderly way by the application - the main application loop. If you are able to send the message as 16 chars, followed by a newline, then here is a test sketch that might work for you. You could regard the loop function as a message-despatcher. But what if this interrupt occurs while you are in the middle of doing something else (like opening the door)? La gua de referencia del lenguaje de programacin de Arduino, organizada en Funciones, Variables y Constantes, y palabras clave de Estructura. In what way is it better? Let's say when an interrupt occurs you take some sort of action (like, closing a door). But having a function called automatically no matter where your code is in it's execution is a better way to go.
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