Added Line follower robot code (pranjay-poddar#5093)

* Create main.cpp

* Create README.md

* Update main.cpp

Author: jaivsh

Arduino Projects/Line Follower bot/README.md

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+## Line follower bot
+
+This projcets presents the source code of a line follower bot. Loading this code into the memory of microcontroller makes it run crazy after a line. 
+
+
+## Requirements
+
+- Arduino UNO
+- DC Motor, 12 V
+- Battery holders
+- Bridge motors
+

Arduino Projects/Line Follower bot/main.cpp

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+int mr1=8;  //motor right 1
+int mr2=9;  //motor right 2
+int ml1=10;   //motor left 1
+int ml2=11; //motor left 2
+int sr=6;   //sensor right
+int   sl=7;   //sensor left
+int svr=0;
+int svl=0;
+int led=13;
+int enr=3; 
+int   enl=5;
+
+int vspeed=100;    
+int tspeed=255;
+int tdelay=20;
+
+void   setup()
+{
+ pinMode(mr1,OUTPUT);
+ pinMode(mr2,OUTPUT);
+ pinMode(ml1,OUTPUT);
+   pinMode(ml2,OUTPUT);
+ pinMode(led,OUTPUT);
+ pinMode(sr,INPUT);
+ pinMode(sl,INPUT);
+   
+ delay(5000);
+}
+
+void loop()
+{
+ svr=digitalRead(sr);
+ svl=digitalRead(sl);
+   
+  if(svl==LOW && svr==LOW)
+  {
+  forward(); //maju
+  }
+
+  if(svl==HIGH   && svr==LOW)
+  {
+  left(); //belok kiri
+  }
+ 
+  if(svl==LOW && svr==HIGH)
+   { 
+  right(); //belok kanan
+  }
+  
+  if(svl==HIGH && svr==HIGH)
+   {
+  stop(); //berhenti
+  }
+}
+
+void forward()
+ {
+  digitalWrite(mr1,HIGH);
+   digitalWrite(mr2,LOW);
+  digitalWrite(ml1,HIGH);
+  digitalWrite(ml2,LOW);
+   analogWrite (enr,vspeed);
+  analogWrite (enl,vspeed);
+ } 
+
+void backward()
+   {
+  digitalWrite(mr1,LOW);
+  digitalWrite(mr2,HIGH);
+  digitalWrite(ml1,LOW);
+   digitalWrite(ml2,HIGH);
+  analogWrite (enr,vspeed);
+  analogWrite (enl,vspeed);
+   }
+
+void right()
+ {
+  digitalWrite(mr1,LOW);
+  digitalWrite(mr2,HIGH);
+   digitalWrite(ml1,HIGH);
+  digitalWrite(ml2,LOW);
+  analogWrite (enr,tspeed);
+   analogWrite (enl,tspeed);
+  delay(tdelay);
+ } 
+
+void left()
+ {
+   digitalWrite(mr1,HIGH);
+  digitalWrite(mr2,LOW);
+  digitalWrite(ml1,LOW);
+   digitalWrite(ml2,HIGH);
+  analogWrite (enr,tspeed);
+  analogWrite (enl,tspeed);
+   delay(tdelay);
+}  
+
+void stop()
+ {
+  analogWrite (enr,0);
+  analogWrite   (enl,0);
+ }