AUTOMATIC VOLTAGE STABILIZER USING MSP430

In this project i have converted old manual type voltage stabilizer into automatic using msp430g2553 ,uln,relays..etc. 


CIRCUIT


PROGRAM

//210-235-265 –SELECTED TAPS WHEN INPUT IS AT 210V AC
//210–0.68V -210 — ON HOLD
//210–0.73V ON RELEASE
//210-235-265
//210–0.68V -210 — ON HOLD
//210–0.73V ON RELEASE
#define lowertap P2_3
#define middletap P1_3
#define uppertap P1_4
int f=1,a;
void setup()
{
    Serial.begin(9600);
initoutputpins ();
offallrelay();
digitalWrite(lowertap,HIGH);delay(2000);  
f=1;  
}
void loop()
{
a=analogRead(A0);  delay(10);     //Serial.println(a); delay(100); 
if(a>=211 &&  a<250 && (f==2 || f==3) ) {  offallrelay();delay(2000);    digitalWrite(lowertap,HIGH); delay(2000);  f=1;  }
else if(a>185 && a<=210 &&(f==1 || f==3)  ) { offallrelay();delay(2000);  digitalWrite(middletap,HIGH); delay(2000); f=2;
          while( a<220 && a>186  ){a=analogRead(A0);  delay(10);}
}
else if (a<=186 &&( f==1 || f==2) ) { offallrelay(); delay(2000);   digitalWrite(uppertap,HIGH); f=3; delay(2000); 
              while( a<193 ){a=analogRead(A0);  delay(10);}
            }
  }
void initoutputpins (void)
{
   pinMode(lowertap,OUTPUT);  pinMode(middletap,OUTPUT);  pinMode(uppertap,OUTPUT);
}
void offallrelay(void)
{
   digitalWrite(lowertap,LOW);digitalWrite(middletap,LOW);digitalWrite(uppertap,LOW);  
}
PCB LAYOUT