The purpose of this week was to make two boards communicate, so I started this off with wired communication. One board transmitted information on a button press to a different receiving board the would turn on the LED strip in response to the button press.

The code used for the transmitting board:

            //Code to transmit
            //Microcontroller has a button input and a digital output.
            //The digital output can be connected to a digital input of a receiving microcontroller to make a simple network.
            //The wired-together devices must share a common ground!

            const int out_pin = 14;
            const int button_pin = 9;

            void setup() {
            pinMode(button_pin, INPUT_PULLUP);  //This is the button pin.
            pinMode(out_pin, OUTPUT);         // pin 5 for digital Write

            Serial.begin(9600);        //for the USB serial devices, this baud rate is meaningless - can be "0"
            }

            void loop() {
            int buttonState = digitalRead(button_pin);
            Serial.println(buttonState);
            digitalWrite(out_pin, buttonState);
            delay(10);
            }
        

The code used for the receiving board:

            //Code to turn on an LED in response to a change in input pin.
            //PS70 use as a simple example of receiving for a wired network 3/30/20.  Rob Hart.

            #include 


            #define PIN        11 
            #define NUMPIXELS 10 

            Adafruit_NeoPixel strip(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

            void setup() {
            pinMode(7, INPUT_PULLUP);   // pin 7 for digitial read

            strip.begin(); // INITIALIZE NeoPixel strip object (REQUIRED)
            strip.show();            // Turn OFF all pixels ASAP
            strip.setBrightness(20); // Set BRIGHTNESS low to reduce draw (max = 255)
            
            }

            void loop() {
            strip.clear(); // Set all pixel colors to 'off'
            if (digitalRead(7)) {
                // The first NeoPixel in a strand is #0, second is 1, all the way up
                // to the count of pixels minus one.
                for(int i=0; i < NUMPIXELS; i++) { // For each pixel...
            
                // strip.Color() takes RGB values, from 0,0,0 up to 255,255,255
                // Here we're using a moderately bright green color:
                strip.setPixelColor(i, strip.Color(100, 0, 70));
            
                strip.show();   // Send the updated pixel colors to the hardware.
            
                delay(200); // Pause before next pass through loop
                }
            }
            else {
                strip.clear();
                }
            }