 
 void displayPIR()
 {
-
+  if ( PIR == 1)
+  {
+    lcd.setCursor(19, 0);
+    lcd.write(5);
+    lcd.setCursor(19, 1);
+    lcd.write(5);
+    lcd.setCursor(19, 2);
+    lcd.write(5);
+    lcd.setCursor(19, 3);
+    lcd.write(5);
+  } else {
+    lcd.setCursor(19, 0);
+    lcd.print(" ");
+    lcd.setCursor(19, 1);
+    lcd.print(" ");
+    lcd.setCursor(19, 2);
+    lcd.print(" ");
+    lcd.setCursor(19, 3);
+    lcd.print(" ");
+  }
 }
 
 void displayTemperature()


void displaydustDensity()
{

  lcd.setCursor(3, 1);   
  if ( 0   < dustDensity =< 0.1 ) {
    lcd.write(4);
    lcd.print("    ");
  }
  if ( 0.1 < dustDensity =< 0.2 ) {
    lcd.write(4);
    lcd.write(4);
    lcd.print("   ");
  }
  if ( 0.2 < dustDensity =< 0.3 ) {
    lcd.write(4);
    lcd.write(4);
    lcd.write(4);
    lcd.print("  ");
  }
  if ( 0.3 < dustDensity =< 0.4 ) {
    lcd.write(4);
    lcd.write(4);
    lcd.write(4);
    lcd.write(4);
    lcd.print(" ");
  }
  if ( 0.4 < dustDensity =< 0.5 ) {
    lcd.write(4);
    lcd.write(4);
    lcd.write(4);
    lcd.write(4);
    lcd.write(4);
  }

}

void requestSharp()


  x = a;
  x = x << 8 | b;

  if (DEBUG_PRINT) {
    Serial.print("X ===>  ");
    Serial.println(x);
  }

  if (( x < 1024 ) && (x != OLD_x )) {
    float calcVoltage = x * (5.0 / 1024.0);
