Assignment2

#include <LiquidCrystal.h>
LiquidCrystal lcd = LiquidCrystal(10,9,8,7,6,5); // Create an LCD object. Parameters: (RS, E, D4, D5, D6, D7):
const int trigPin = 12;
const int buttonPin = 2;     // the number of the pushbutton pin
int sensorPin = 0;
const int echoPin = 11;
float time, distance;
// Variables will change:
int buttonPushCounter = 0;   // counter for the number of button presses
int buttonState = 0;         // current state of the button
int lastButtonState = 0;     // previous state of the button
void setup() 
{
    lcd.begin(16, 2); // Specify the LCD's number of columns and rows. Change to (20, 4) for a 20x4 LCD
    pinMode(trigPin, OUTPUT);  
	pinMode(echoPin, INPUT);  
    pinMode(buttonPin, INPUT);
	Serial.begin(9600);
  
}

void loop() 
{
  buttonState = digitalRead(buttonPin);

  // compare the buttonState to its previous state
  if (buttonState != lastButtonState) {
    // if the state has changed, increment the counter
    if (buttonState == HIGH) {
      // if the current state is HIGH then the button went from off to on:
      buttonPushCounter++;
      Serial.println("on");
      Serial.print("number of button pushes: ");
      Serial.println(buttonPushCounter);
    } else {
      // if the current state is LOW then the button went from on to off:
      Serial.println("off");
    }
    // Delay a little bit to avoid bouncing
    delay(50);
  }
  // save the current state as the last state, for next time through the loop
  lastButtonState = buttonState;
  if (buttonPushCounter  == 1){
     // turn LED on:
    digitalWrite(trigPin, LOW);  
    delayMicroseconds(2);  
    digitalWrite(trigPin, HIGH);  
    delayMicroseconds(10);  
    digitalWrite(trigPin, LOW);  

 	time = pulseIn(echoPin, HIGH);

	distance = (time*.0343)/2;  

// For Serial Monitor
	Serial.print("Distance:CM ");  
	Serial.println(distance);  

 // For LCD Display
	lcd.setCursor(0,0);
	lcd.print("Distance in CM");
	lcd.setCursor(0,1);
	lcd.print(distance);
  }else if (buttonPushCounter  == 2){
     int reading = analogRead(sensorPin);

 // measure the 5v with a meter for an accurate value
 //In particular if your Arduino is USB powered

 float voltage = reading * 5.0;
 voltage  /= 1024.0;
 
 // now print out the temperature

 float temperatureC = (voltage - 0.5) * 100 ;
 Serial.print(temperatureC);
 Serial.println(" degrees C");

   lcd.setCursor(0,0);
   lcd.print("Temperature Value ");
   lcd.setCursor(0,1);
   lcd.print(" degrees C");
   lcd.setCursor(11,1);
   lcd.print(temperatureC);
  }else{
	buttonPushCounter = 0;
  }
  

}