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The communication between your PC and Arduino is full-duplex. Duplex communication can be further divided into half-duplex, where only one side can send data at a point in time (and the other side listens and waits for their turn to send) and full-duplex, where both sides can send and receive data simultaneously. This is called the baud rate.Ĭommunication is of two types, simplex, where the role of the sender and receiver are fixed (one way) and duplex, where either side is capable of sending and receiving (both ways). However, the two devices must agree on the speed of communication (the rate at which bits are sent and received) beforehand. It requires only two wires to achieve two-way communication and requires no extra synchronization between the two end-points, which brings down the cost and complexity of the required hardware. This is in contrast to parallel communication, where data is still sent multiple bits at a time. “Serial” communication, as the name suggests, is about sending data one bit at a time sequentially. Let’s get started! What is Serial communication? I will then provide two sample programs which demonstrate the use of the Serial monitor and Serial library for two-way communication between an Arduino and PC. I will start with a short introduction to “Serial” communication on the Arduino and explain the flow of data between the PC and Arduino. This is where Serial communication (between the PC and Arduino) can be used for debugging or analyzing program values. Since an Arduino does not come with a built-in display or rich debugging capabilities, these are not very straight-forward to do. While this is happening, there might be bugs, or a need to simply analyze some data points/variables. In the case of an Arduino, the program is uploaded to and runs on the board completely in isolation.
WEB SERIAL PORT COMMUNICATION ARDUINO HOW TO
In this blog, I will show how to use the built-in Serial port on all Arduinos to communicate back and forth with your PC using the Serial library and the Serial monitor.