7 Segment Display

7 Segment Display Sparkfun 09767

Das Display bei Sparkfun.
Für die Ansteuerung braucht es nur +5V, GND sowie eine Verbindung mit dem Rx Pin.
Für die Serielle Verbindung wird hier die NewSoftSerial Bibliothek verwerndet.
/*
Example for Sparkfun 4 Digit 7 Segment Display 09767

Pin Configuration:
VCC - 2,6 - 5,5V
GND - GND
RX - Serial Pin Arduino

This code uses New Soft Serial Library
All pins are possible serial pins...
DOWNLOAD http://arduiniana.org/libraries/newsoftserial/
*/

#include
NewSoftSerial mySerial(4, 5);        // define Rx Tx Pins

byte count = 0;                      // conter
byte decimals[4];                    // decimals array

// the setup -------------------------------------------------
void setup()
{
  Serial.begin(9600);                // setup serial communication
  Serial.println("start");           // between arduino and computer

  mySerial.begin(9600);              // setup software serial communication
  delay(100);                        // between arduino and 7 segment display
  mySerial.print(0x76);              // reset the 7 segment display
}

// the loop -------------------------------------------------
void loop()
{
  calculateDigits(count, decimals); // pass the count and decimals array as argument
                                    // to calculate the single digits form a 3 decimals number
                                    // from 0 - 255
                                    // 234 becomes 2, 3, 4

  showDigits(decimals);             // pass the decimals array as argument
                                    // and write them to the screen

   count++;
   if (count > 255){
     count = 0;
   }

  delay(500);
}

// functions -------------------------------------------------
void showDigits(byte pdata[]){
   mySerial.print(pdata[0]);
   mySerial.print(pdata[1]);
   mySerial.print(pdata[2]);
   mySerial.print(pdata[3]);
}

void calculateDigits(byte cnt, byte pdata[]){
   pdata[0] = 0x78;                   // empty character
   pdata[1] = cnt /100;             // 100
   pdata[2] = (cnt /10) % 10;       // divided by 10 modulo 10
   pdata[3] = (cnt % 100) % 10;     // modulo 100 modulo 10
}