Crystal LCD, Temperature Sensor and DC Motor

Motor control using Temperature sensor

Description: 

The DC motor is controlled through the Temperature Sensor using the following criteria. 

• When the Temperature reading is above 90' F, the motor is turned ON. "Motor is ON" status and Temperature value is displayed on the LCD screen. 
• When the Temperature reading is less than 90' F, the motor is turned OFF. "Motor is OFF" status and Temperature value is displayed on the LCD screen. 

Working Demo: 

https://youtu.be/8wGgASq5C84

Components required:

1. Arduino UNO
2. DC motor
3. Motor Driver [L293D]
4. Battery [9V]
5. LCD [16 * 2]
6. Temperature Sensor [TMP36]

Schematic diagram:

Code: 

#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

int celsius = 0;
int fahrenheit = 0;
int Ena=7;
void setup()
{
  lcd.begin(16, 2);
  pinMode(A0, INPUT);
  pinMode(13, OUTPUT);
  pinMode(8, OUTPUT);
  analogWrite(Ena,255);
}

void loop()
{
  celsius = map(((analogRead(A0))), 0, 1023, 30, 70);
  fahrenheit = ((celsius * 9) / 5 + 32);
  Serial.print(celsius);
  Serial.print(" C, ");
  Serial.print(fahrenheit);
  Serial.println(" F");
  
   if (fahrenheit < 100) 
   {
     lcd.setCursor(0, 0);
    digitalWrite(8, LOW);
    digitalWrite(13, LOW);
    lcd.print("Motor is off");
    lcd.setCursor(0, 1);
  lcd.print(fahrenheit);
     lcd.setCursor(2, 1);
     lcd.print("-F");
     lcd.setCursor(4, 1);
     lcd.print(" ");
     
  }
  
  if (fahrenheit > 100)
  {
    digitalWrite(13,LOW);
    digitalWrite(8, HIGH);
    lcd.setCursor(0, 0);
    lcd.print("Motor is on "); 
    lcd.setCursor(0, 1);
    lcd.print(fahrenheit);
    lcd.setCursor(3, 1);
    lcd.print("-F");
  }
  
  delay(1000); 
}