LOAD CELL INTERFACING USING ADS1231 AND MSP430 LAUNCHPAD (MSP430G2553)

CIRCUIT

OUTPUT DATA SCREEN SHOT

PROGRAM

//CONNECTIONS
#define POWERDOWN P1_0    //POWERDOWN -LOW TO POWER DOWN
#define SPEED P1_4    //Chip selection pin
#define DATAPIN P1_5    //Data pin
#define CLOCK P1_6 //ADS 7817 clock
#define ZEROSWITCH P1_3
 unsigned long   adcvalue;
 short int i;
 float c,y,x,z;
void setup() 
{         
 initspi();
 Serial.begin(9600); //Initialize serial for debugging
 pinMode(ZEROSWITCH, INPUT_PULLUP);
 caliberate();
}
void loop() 
{
 displaydata();
 //delay(200);
 if(!digitalRead(ZEROSWITCH))
 {
 caliberate();
 //float c=y;
 }
}
void readADS1231(void) 
{
 adcvalue=0;  
 //digitalWrite(POWERDOWN, HIGH); //POWER ON
 while(digitalRead(DATAPIN));//WAIT UNTIL DATA IS READY
 //24-->21
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X800000;} //24
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X400000;}//23
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X200000;}//22
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X100000;}//21
 //20-->17
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X80000;} //20
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X40000;}// 
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X20000;}// 
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X10000;}//17
 //16-->13
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X8000;} //16
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X4000;}// 
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X2000;}// 
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X1000;}//13
 //12-->9
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X800;} //12
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X400;}// 
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X200;}// 
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X100;}//9
 //8-->5
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X80;} //8
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X40;}// 
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X20;}// 
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X10;}//5
 //4-->1
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X8;} //4
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X4;}// 
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X2;}// 
 clock ();
 if(digitalRead(DATAPIN)){adcvalue=adcvalue+0X1;}//1
 clock ();//TO PULL DATA READY TO HIGH STATE --PAGE No.14 ON ADS1231 DATASHEET
 //
 digitalWrite(CLOCK, LOW);  
 //digitalWrite(POWERDOWN, LOW);
}
void caliberate(void)
{
 readADS1231();
 c=(adcvalue/100.0);
 Serial.print("caliber=");Serial.println(c);  
}
void displaydata(void)
{
    readADS1231();
 z=(adcvalue/100.0);//100000
 z=z-c;
    readADS1231();
 x=(adcvalue/100.0);//100000
 x=x-c;
    readADS1231();
 y=(adcvalue/100.0);//100000
 y=y-c;
 y=(y+x+z)/3.0;
 Serial.print("adcvalue=");Serial.println(y);  
}
void clock (void)
{
 digitalWrite(CLOCK, LOW);  
 digitalWrite(CLOCK, HIGH);
 delayMicroseconds(10);
}
void initspi(void)
{
 pinMode(POWERDOWN, OUTPUT);  
 pinMode(DATAPIN, INPUT);
 pinMode(CLOCK, OUTPUT);
 pinMode(SPEED, OUTPUT);
 digitalWrite(POWERDOWN, HIGH); //0--> POWERDOWN(SLEEPING -NO CONVERSION) ,1-->WORKING MODE
 digitalWrite(SPEED, 0);//0--> 10SPS ,1-->80SPS
 digitalWrite(CLOCK, LOW);
}