Assignment 3(B)

Objectives

• To make a smart distance alert system using proximity sensor.


• To take input from proximity sensor and give desired output on LCD display.


• To make use of buzzer and LED to indicated different distance zones by different intensities.

Devices/Components used

• Arduino UNO : Controller


• Proximity Sensor : Input Device


• LCD Display : Output Device


• Buzzer : Output


• Green LED : Output


• Breadboard


• M-M Connectors


• M-F Connectors

Software Used : Arduino IDE

Library Used : SR04 and LiquidCrystal I2C

Circuit and Wiring

Arduino Code

For Arduino Code click here.

#include <SR04.h>                                                                
                                                                                 
          const int trigPin = 9;                                                 
          const int echoPin = 10;                                                
          const int led = 2;                                                     
          long duration;                                                         
          int distance;                                                          
                                                                                 
          SR04 sr04 = SR04(echoPin, trigPin);                                    
          #include <Wire.h>                                                      
          #include <LiquidCrystal_I2C.h>                                         
                                                                                 
          // Set the LCD address to 0x27 for a 16 chars and 2 line display       
          LiquidCrystal_I2C lcd(0x27, 16, 2);                                    
                                                                                 
                                                                                 
          void setup() {                                                         
            // put your setup code here, to run once:                            
            pinMode(trigPin, OUTPUT);                                            
            pinMode(echoPin,INPUT);                                              
            pinMode(led,OUTPUT);                                                 
                                                                                 
            lcd.begin();                                                         
            // Turn on the blacklight and print a message.                       
            lcd.backlight();                                                     
            Serial.begin(9600);                                                  
                                                                                 
          }                                                                      
                                                                                 
          void loop() {                                                          
            // put your main code here, to run repeatedly:                       
                                                                                 
                                                                                 
            distance = sr04.Distance();                                          
            //distance = duration*0.034/2;                                       
                                                                                 
            Serial.print("Distance: ");                                          
            Serial.print(distance);                                              
            lcd.clear();                                                         
            lcd.print("Distance : ");                                            
            lcd.print(distance);                                                 
            lcd.setCursor (0,1); // go to start of 2nd line                      
            if(distance >45){                                                    
              lcd.print("   SAFE    :D ");                                       
              //tone(led, 0, 0);                                                 
              noTone(led);                                                       
              //analogWrite(led, 0);                                             
            }                                                                    
            else if(distance <=45 && distance > 20 ){                            
              lcd.print("   AWARE   :0");                                        
              tone(led, 15000);                                                  
              //analogWrite(led, 100);                                           
            }                                                                    
            else{                                                                
              lcd.print("   STOP    :( ");                                       
              tone(led, 30);                                                     
              //analogWrite(led, 255);                                           
            }                                                                    
                                                                                 
                                                                                 
            delay(500);                                                          
          }                                                                      

Summary Video

Here is a video to show the working of the circuit and program.

Conclusion

• The smart alert system for distance worked properly and corresponding values were shown on the LCD Display.


• The LED and buzzer gave signals with different intensities for different zones of deistance.


• This can have various applications in self driving cars and as alert system while parking vehicles.