binarydecoder.ino

// Binary Decoder Project
// Sparkle Labs
// Set a binary number with a DIP switch and decode it in the 
// serial port monitor.
// 
//                                                                  
//                            +--------------------------------+    
//                            | +----------------------------+ |    
//                            | | +------------------------+ | |    
//                            | | | +--------------------+ | | |    
//     +----------------------+-+-+-+-------+            | | | |    
//     |    G 1 1 1 1 9 8 7 6 5 4 3 2 1 0   |          +-+-+-+-+-+  
//     |    N 3 2 1 0                       |          |         |  
//     |    D     ~ ~ ~     ~ ~   ~         |          | 1 2 3 4 |  
//  +--+-+                                  |          |         |  
//  | USB|                                  +-+        +-+-+-+-+-+  
//  +--+-+              +---------------+     |          | | | |    
//     |                | ARDUINO  UNO  |     |          +-O-O-O    
//     |                +---------------+     |                |    
//     |                                      |                |    
//     |              G G                     |                |    
//     |            5 N N     A A A A A A     |                |    
//     |            V D D     0 1 2 3 4 5   +-+                |    
//     +------------------------------------+               ---+--- 
//                                                           --+--  
//                                                            -+-   
//     
// Here are variables to store the state of the different switches.
int onebit;
int twobit;
int fourbit;
int eightbit;
// Here we store the total value.
int halfbyte;

void setup() {                
  pinMode(2,INPUT_PULLUP); // This setting allows us to have a switch without using a resistor.
  pinMode(3,INPUT_PULLUP); // The pin is pulled up to 5volts when the switch is open.
  pinMode(4,INPUT_PULLUP);
  pinMode(5,INPUT_PULLUP);
  Serial.begin(9600);   
}

void loop() {
// First we read in all of the pins.
onebit = digitalRead(5);
twobit = digitalRead(4);
fourbit = digitalRead(3);
eightbit = digitalRead(2);
// Then add the values together.
halfbyte = onebit + twobit * 2 + fourbit * 4 + eightbit * 8;
Serial.println(halfbyte);
}