finaluno.txt

#include <SoftwareSerial.h>
#include <avr/sleep.h>
#include <avr/power.h>
#include <avr/wdt.h>

#define wlevel1 500
#define valve_PIN (4)
#define temp (analogRead(A1)*500)/1023
#define light analogRead(A0)//node level
#define water analogRead(A2)//node level
#define pH analogRead(A3)//computation at pi

volatile int f_wdt=1;

// Watchdog Interrupt Service. This is executed when watchdog timed out.

ISR(WDT_vect)
{
  if(f_wdt == 0)
  {
    f_wdt=1;
  }
  else
  {
    Serial.println("WDT Overrun!!!;");
  }
}
// Enters the arduino into sleep mode.

void enterSleep(void)
{
  set_sleep_mode(SLEEP_MODE_PWR_DOWN);   /* EDIT: could also use SLEEP_MODE_PWR_SAVE for higher power consumption. */
  sleep_enable();
  
  /* Now enter sleep mode. */
  sleep_mode();
  
  /* The program will continue from here after the WDT timeout*/
  sleep_disable(); /* First thing to do is disable sleep. */
  
  /* Re-enable the peripherals. */
  power_all_enable();
}

// Setup for the serial comms and the Watch dog timeout. 
void frame()
{  
  Serial.print(";N2;");
  Serial.print("T");
  Serial.print(temp);
  Serial.print(";L");
  Serial.print(light);
  Serial.print(";M");
  Serial.print(water);
  Serial.print(";P");
  Serial.print(pH);
  Serial.print(";");
    delay(500);
}

void setup()
{
  Serial.begin(9600);
  pinMode(valve_PIN,OUTPUT);
 Serial.println("setup");
 delay(1000);
 digitalWrite(valve_PIN,LOW);
  /*** Setup the WDT ***/
  
  /* Clear the reset flag. */
  MCUSR &= ~(1<<WDRF);
  
  /* In order to change WDE or the prescaler, we need to
   * set WDCE (This will allow updates for 4 clock cycles).
   */
  WDTCSR |= (1<<WDCE) | (1<<WDE);

  /* set new watchdog timeout prescaler value */
  WDTCSR = 1<<WDP0 | 1<<WDP3; /* 8.0 seconds */
  
  /* Enable the WD interrupt (note no reset). */
  WDTCSR |= _BV(WDIE);
  
}

//int i,j,k;//ifor 20mins, j for 6 hrs
int i=0;
int r;
char c[9];
char wlevel[3];
void loop()
{
/* Don't forget to clear the flag. */
    f_wdt = 0;    
/* Re-enter sleep mode. */
    enterSleep();
//Serial.print(i);    
//Serial.println(". 8 secs");
//delay(1000);
//sleep_watchdog_8sec
if(i==1)//150
{
  frame();
  //delay(1000);
  i=0;
  if((c[0]=Serial.read())==';'){
  for(r=1;r<8;r++){
  c[r]=Serial.read();
  }
  if(c[1]=='N'&&c[2]=='2')
  {
    if(c[4]=='W' && c[5]!='0')
    {
      wlevel[0]=c[5];
      wlevel[1]=c[6];
      wlevel[2]=c[7];
      Serial.print("hi");
      delay(1000);
       while(water>atoi(wlevel))
    {
      Serial.print(atoi(wlevel));
      digitalWrite(valve_PIN,HIGH);
    }
    digitalWrite(valve_PIN,LOW);
  
    }
  }
 }
   while(water>wlevel1)
    {
      //Serial.print(atoi(wlevel));
      digitalWrite(valve_PIN,HIGH);
    }
    digitalWrite(valve_PIN,LOW);
}
  i++;
}