// interfacing dc motor int 
in1 = 2; int in2 = 3; void 
setup() { 
 // put your setup code here, to run once: 
 pinMode(in1, OUTPUT); pinMode(in2, 
OUTPUT); 
 Serial.begin(9600); 
} 
void cw(){ digitalWrite(in1, 
HIGH); digitalWrite(in2, 
LOW); 
 Serial.println("Clock Wise"); 
} 
void acw(){ digitalWrite(in1, 
LOW); digitalWrite(in2, 
HIGH); 
 Serial.println("Anti-Clock Wise"); 
} 
void stop(){ 
digitalWrite(in1, LOW); 
digitalWrite(in2, LOW); 
 Serial.println("Stop"); 
} 
void loop() { 
 // put your main code here, to run repeatedly: 
 if(Serial.available()){ 
char c = Serial.read(); int k 
= c - '0'; 
 if(k == 1){ 
cw(); }else 
if(k==2){ 
acw(); }else 
if(k==0){ 
stop(); 
 } 
 delay(5000); 
 } 
} 
Elevator system with LED lights 
// elevator system 
// 10sec - time for transition 
// 5sec - loading and unloading 
int in1 = 2; int 
in2 = 3; int r = 
6; int g = 8; 
int b = 10; 
void cw(){ digitalWrite(in1, 
HIGH); digitalWrite(in2, 
LOW); 
 Serial.println("Clock Wise"); 
} 
void acw(){ digitalWrite(in1, 
LOW); digitalWrite(in2, 
HIGH); 
Serial.println("Anti-Clock Wise"); 
} 
void stop(){ 
digitalWrite(in1, LOW); 
digitalWrite(in2, LOW); 
 Serial.println("Stop"); 
} 
void setup() { 
 // put your setup code here, to run once: 
 pinMode(in1, OUTPUT); 
pinMode(in2, OUTPUT); pinMode(r, 
OUTPUT); pinMode(g, OUTPUT); 
pinMode(b, OUTPUT); 
 Serial.begin(9600); 
} 
void loop() { 
 // put your main code here, to run repeatedly: 
Serial.println("loading..."); 
digitalWrite(g, HIGH); 
delay(5000); digitalWrite(g, 
LOW); 
 Serial.println("Moving Up..."); 
digitalWrite(r, HIGH); cw(); 
delay(10000); digitalWrite(r, 
LOW); stop(); 
 Serial.println("Unloading..."); 
digitalWrite(b, HIGH); 
delay(5000); digitalWrite(b, 
LOW); Serial.println("Moving 
Down..."); digitalWrite(r, HIGH); 
acw(); 
 delay(10000); digitalWrite(r, 
LOW); stop(); 
} 

 
// interfacing dc motor int 
in1 = 2; int in2 = 3; void 
setup() { 
 // put your setup code here, to run once: 
 pinMode(in1, OUTPUT); pinMode(in2, 
OUTPUT); 
 Serial.begin(9600); 
} 
void cw(){ 
 digitalWrite(in1, HIGH); digitalWrite(in2, 
LOW); 
 Serial.println("Clock Wise"); 
} 
void acw(){ digitalWrite(in1, 
LOW); digitalWrite(in2, 
HIGH); 
Serial.println("Anti-Clock Wise"); 
} 
void stop(){ 
digitalWrite(in1, LOW); 
digitalWrite(in2, LOW); 
 Serial.println("Stop"); 
} 
void loop() { 
 // put your main code here, to run repeatedly: 
 if(Serial.available()){ 
char c = Serial.read(); 
 if(c == ‘F’){ 
cw(); }else if(c == 
‘R’){ acw(); 
}else { stop(); 
 } 
 delay(5000); 
 } 
}