Building Arduino PLCs by Pradeeka Seneviratne

By Pradeeka Seneviratne

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Connect the Arduino UNO board to the computer with a USB type A/B cable. Now you are ready to upload the sample sketch provided with the Arduino IDE. 1. Open the Arduino IDE and on the menu bar and choose File ➤ Examples ➤ Ethernet 2 ➤ WebClient. A sample sketch for a web client (Listing 2-5) will open in a new window. Listing 2-5. h> // Enter a MAC address for your controller below. Serial) { ; // wait for serial port to connect. stop(); // do nothing forevermore: while (true); } } 2. Change the MAC address according to your Ethernet shield or just keep it as it is.

It provides a graphical representation of the output. 46 Chapter 2 ■ Arduino, Ethernet, and WiFi Figure 2-24. begin(). begin(9600); The begin() function of the Serial class accepts the baud rate in bits per second. It opens the serial port for communication and sets the data rate to 9600bps. 9600 bits per second is the default for the Arduino, and is perfectly adequate for the majority of users, but you could change it to one of these rates: 300, 600, 1200, 2400, 4800, 9600, 14400, 19200, 28800, 38400, 57600, or 115200.

A sample sketch for a web client (Listing 2-5) will open in a new window. Listing 2-5. h> // Enter a MAC address for your controller below. Serial) { ; // wait for serial port to connect. stop(); // do nothing forevermore: while (true); } } 2. Change the MAC address according to your Ethernet shield or just keep it as it is. byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; 3. Next, change the IP address. Be sure to use one within your network’s valid IP address range. IPAddress ip(192, 168, 0, 177); 4.

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