void loop() is not looping

hello,
i trying program automatic water level controller. have used 2 arduino modules. 1 sensor side , control side. program control side:

code: [select]

#include <liquidcrystal.h>
#define echo 0
#define motor 8
#define buzzer 12

liquidcrystal lcd(2,3,4,5,6,7);

float distance=0;
int temp=0;
void setup()
{
lcd.begin(16,2);
pinmode(echo,input);
pinmode(motor, output);
pinmode(buzzer, output);
lcd.print("  water level ");
lcd.setcursor(0,1);
lcd.print("   indicator  ");
serial.begin(9600);
delay(2000);
}

void loop()
{
 while(serial.available()>0){
 distance=serial.parsefloat()-'0';}
 lcd.clear();
 lcd.print("water space in  ");
 lcd.setcursor(0,1);
 lcd.print("tank is: ");
 lcd.print(distance);
 lcd.print("cm");
 delay(1000);
if(distance<12 && temp==0)
{
    digitalwrite(motor, low);
    digitalwrite(buzzer, high);
    lcd.clear();
    lcd.print("water tank full ");
    lcd.setcursor(0,1);
    lcd.print("motor turned off");
    delay(2000);
    digitalwrite(buzzer, low);
    delay(3000);
    temp=1;
}

 else if(distance<12 && temp==1)
{
    digitalwrite(motor, low);
    lcd.clear();
    lcd.print("water tank full ");
    lcd.setcursor(0,1);
    lcd.print("motor turned off");
    delay(5000);
}

else if(distance>30)
{
  digitalwrite(motor, high);
  lcd.clear();
  lcd.print("low water level");
  lcd.setcursor(0,1);
  lcd.print("motor turned on");
  delay(5000);
  temp=0;
}
}

the void loop not looping. 1 distance ultrasonic sensor. when distance changes, not reflected on code. can guide me have gone wrong. in advance

moderator edit: [code] [/code] tags added.

it easier read or copy , paste code if used
[/s]
[code]code tags[/code]
[s]
, (which you're always supposed when posting code).
even better if hit ctrl-t or ">tools auto format" in ide correctly format code before posting it.
it done you.

in diagram, arduinos aren't connected gnd.

why subtract '0' here?:-
distance=serial.parsefloat()-'0';

edit: , perhaps should show other half of code - sender.
also, 'distance' 'float'?

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