ANALOG TO DIGITAL CONVERTER ADS7816 INTERFACING WITH ARDUINO

PINOUT

CIRCUIT DIAGRAM

PROGRAM

#define CS 10    //Chip selection pin
                     #define DATAPIN 12    //Data pin
                     #define CLOCK 6    //ADS 7817 clock
                     void setup()
                     {
                       initspi();
                       Serial.begin(9600);    //Initialize serial for debugging
                     }
                     void loop()
                     {
                       int a = readADS7817();
                       Serial.println(a);
                       delay(200);    //Delay between data sampling streams
                     }
                     void del1(void)
                     {
                       delayMicroseconds(1);
                     }
                     void initspi(void)
                     {
                       pinMode(CS, OUTPUT);    //Set up pin modes
                       pinMode(DATAPIN, INPUT);
                       pinMode(CLOCK, OUTPUT);
                       //Ensure ADS7817 is powered off to start
                       digitalWrite(CS, HIGH);    //Pin needs to be high for shutdown mode
                       digitalWrite(CLOCK, LOW);
                     }
                     int readADS7817()
                     {
                       int adcvalue=0;
                       digitalWrite(CS, LOW);    //Select the ADS7817
                       //Cycle clock to ignore two null bits of data transferred
                         clock ();
                         clock ();
                       //Read the 12 data bits from ADS 7817
                       for (int i=11; i>=0; i--)
                       {
                         clock ();
                         adcvalue+=digitalRead(DATAPIN)<<i;//???
                       }
                       digitalWrite(CS, HIGH);    //Power down ADS7817
                       return adcvalue;
                     }
                     void clock (void)
                     {
                       digitalWrite(CLOCK, HIGH);
                       digitalWrite(CLOCK, LOW);
                     }