networking and communications

individual assignment:

design, build, and connect wired or wireless node(s) with network or bus addresses

i2c

With i2c several boards can communicate with each other. The i2c is not very fast or can transfer a lot of data or over long distances. This does not bother us in this case because it allows us a simple communication possibility with only 4 cables.
We communicate via the master slave system. For this we need a master which controls the communication and we can have up to 112 slaves. The slaves cannot communicate with each other but only via the master. How this works exactly I show you in the following with code examples.

Master

Here is an example of how a master sends a slave a night shift in the setup we first of all initialize the connection. In the Loop we start the communication and start with beginTransmission(8) where 8 is the Id of our slave. After that we can send messages with write() and when we are done we write endTransmission().

      
        
        #include    

        void setup() {
          Serial.begin(9600);
          Wire.begin();     
        }
        
        void loop() {
          
          Wire.beginTransmission(8); 
          Wire.write("x is ");     
          Wire.write(x);             
          Wire.endTransmission();   
        
          x++;
          delay(500);
        
        }

Slave

As with the master, we start the connection to the slave in the setup. Here we also define the ID of the slave in the brackets. Furthermore we call the Metheode onReceive(receiveEvent) which we connect to our receiveEvent. In this methode we first read the string and let it be displayed on the screen. Then we read the number and display it.

      
        #include    

          byte SlaveReceived = 0;
          
          void setup() {  
            Serial.begin(9600);
            Wire.begin(8);  
            Wire.onReceive(receiveEvent);
          }
          
          void loop() {  
              delay(100);
            
          }
          
          void receiveEvent(int howMany)
          {
            while(1 < Wire.available()) 
            {
              char c = Wire.read(); 
              Serial.print(c);
            }
            int x = Wire.read();
            Serial.println(x);
          }

Plan

Now how can I best integrate this into my robot system. It would be practical to have a main block with a brain and different sensor and actuator blocks. These can then simply be plugged together using the existing magnet system, which can also be used to transfer data from the I2C bus. Then the master can see what is connected and use these blocks with sensors and actuators.

Circuits

So I started designing circuit boards. As master I will use my already created main board with the Atmega328p. For this purpose I have designed 3 more boards for the first time.
An impud device board similar to the imput board with 4 IR sensornn.
An output board with an Attyni 45 which can control 2 actuators.
And a horn to control more I2C sensors and actuators.

Imput board