Networking & Communications

• Design and build a wired &/or wireless network connecting at least two processors

Arduino to Arduino Serial Communication

First I tried a serial communication between two Arduino unos through the serial ports (RX and TX). The schematic below shows how I connected them together.

The TX goes to RX and RX goes to TX, also there has to be a common ground between the two or else it will not function properly.

Programming

For Master board I used the following code to sent "H" to turn on the Slave board's led for 1 sec , and sent "L" to turn off the Slave board's led for 1 sec

                    //Master
                    void setup() {
                    Serial.begin(9600);
                    }
                    void loop() {
                    Serial.print('H');
                    delay(1000);
                    Serial.print('L');
                    delay(1000);
                    }
                  

For Slave board I used PhysicalPixel Example to obtain the information from the serial port and turns on the LED if it gets "H", and turns it off if it is "L".

                    /*
                    Physical Pixel


                     created 2006
                     by David A. Mellis
                     modified 30 Aug 2011
                     by Tom Igoe and Scott Fitzgerald

                     This example code is in the public domain.

                     http://www.arduino.cc/en/Tutorial/PhysicalPixel
                     */

                    const int ledPin = 13; // the pin that the LED is attached to
                    int incomingByte;      // a variable to read incoming serial data into

                    void setup() {
                      // initialize serial communication:
                      Serial.begin(9600);
                      // initialize the LED pin as an output:
                      pinMode(ledPin, OUTPUT);
                    }

                    void loop() {
                      // see if there's incoming serial data:
                      if (Serial.available() > 0) {
                        // read the oldest byte in the serial buffer:
                        incomingByte = Serial.read();
                        // if it's a capital H (ASCII 72), turn on the LED:
                        if (incomingByte == 'H') {
                          digitalWrite(ledPin, HIGH);
                        }
                        // if it's an L (ASCII 76) turn off the LED:
                        if (incomingByte == 'L') {
                          digitalWrite(ledPin, LOW);
                        }
                      }
                    }

                  

Bridge to Arduino Serial Communication

I wanted to try a serial communication between Neil's bridge board and Arduino Uno.

First I fabricated the bridge board.

Then programmed it to send "H" to turn the Arduino's Led (ON), and send "L" to turn the Arduino's Led (OFF).

                        #include < SoftwareSerial.h >
                        SoftwareSerial mySerial (3,4); // (TX,RX)

                        void setup() {
                          mySerial.begin(9600);

                        }

                        void loop() {
                          mySerial.println('H');
                          delay(1000);
                          mySerial.println('L');
                          delay(1000);

                        }
                      

Then made the connection between the bridge and the slave Arduino I used before. The TX goes to TX and RX goes to RX, also there has to be a common ground between the two or else it will not function properly.