Tutorial on how to control 12V Devices with Arduino

1int light_intensity;
2#define LedPin A3
3#define PhotoresistorPin   A5
4
5void setup() {
6 pinMode(LedPin, OUTPUT);
7 pinMode(PhotoresistorPin,   INPUT);
8}
9
10void loop() {
11  light_intensity=analogRead(PhotoresistorPin);
12   if (light_intensity > 290) 
13    digitalWrite(LedPin,HIGH); 
14  else     
15     digitalWrite(LedPin,LOW);
16

1int motion_detected;
2#define LedPin A3
3#define MSPin 10
4
5void  setup() {
6  Serial.begin(9600);  
7  //Calibrating sensor 
8  Serial.println("Calibrating  sensor "); 
9  delay(60000); 
10  Serial.println("Done"); 
11  pinMode(LedPin,  OUTPUT);
12  pinMode(MSPin, INPUT);
13}
14
15void loop() {
16 motion_detected  =digitalRead(MSPin);
17 if(motion_detected == HIGH)
18   digitalWrite(LedPin,  HIGH); 
19 else
20   digitalWrite(LedPin, LOW);      
21}

1int LED_Intensity;
2#define LedPin 5
3#define PotentiometerPin A6
4
5void  setup() {
6 pinMode(LedPin, OUTPUT);
7 pinMode(PotentiometerPin, INPUT);
8}
9
10void  loop() {
11  LED_Intensity=map(analogRead(PotentiometerPin),0,1023,0,255);
12  analogWrite(LedPin, LED_Intensity);
13}
14

1int motion_detected;
2#define LedPin A3
3#define MSPin 10
4
5void
6  setup() {
7  Serial.begin(9600);  
8  //Calibrating sensor 
9  Serial.println("Calibrating
10  sensor "); 
11  delay(60000); 
12  Serial.println("Done"); 
13  pinMode(LedPin,
14  OUTPUT);
15  pinMode(MSPin, INPUT);
16}
17
18void loop() {
19 motion_detected
20  =digitalRead(MSPin);
21 if(motion_detected == HIGH)
22   digitalWrite(LedPin,
23  HIGH); 
24 else
25   digitalWrite(LedPin, LOW);      
26}

1int light_intensity;
2#define LedPin A3
3#define PhotoresistorPin  A5
4
5void setup() {
6 pinMode(LedPin, OUTPUT);
7 pinMode(PhotoresistorPin,  INPUT);
8}
9
10void loop() {
11  light_intensity=analogRead(PhotoresistorPin);
12  if (light_intensity > 290) 
13    digitalWrite(LedPin,HIGH); 
14  else     
15    digitalWrite(LedPin,LOW);
16