Arduino 5：馬達控制--使用IRF520控制轉速

延續上一篇的利用IRF520控制1W的LED，並且加上[可變電阻]直接控制轉速

1.                                        // named constants for the switch and motor pins
2. const int motorPin =  9; // the number of the motor pin
3. const int potentialPin= 0;  // potential meter
4. int   value = 0;
5. 
   
6. void setup() {
7.                         // initialize the motor pin as an output:
8.   pinMode(motorPin, OUTPUT);      
9.                         // initialize the switch pin as an input:
10.      // pinMode(potentialPin, INPUT);  No need declare Analog
11. }
12. 
    
13. void loop(){
14.    
15.   value = analogRead(potentialPin);
16.   int intensity = map(value, 0, 1023, 0, 255);
17.   
18.   analogWrite( motorPin , intensity);  
19. }

多加個[開關]，只有在按下[開關]時，馬達才會運轉

1.                                        // named constants for the switch and motor pins
2. const int switchPin = 2; // the number of the switch pin
3. const int motorPin =  9; // the number of the motor pin
4. const int potentialPin= 0;  // potential meter
5. 
   
6. int switchState = 0;  // variable for reading the switch's status
7. 
   
8. void setup() {
9.                         // initialize the motor pin as an output:
10.   pinMode(motorPin, OUTPUT);      
11.                         // initialize the switch pin as an input:
12.   pinMode(switchPin, INPUT);
13.                        // pinMode(potentialPin, INPUT);  No need declare Analog
14. }
15. 
    
16. void loop(){
17.                         // read the state of the switch value:
18.   switchState = digitalRead(switchPin);
19.   
20.   int value = analogRead(potentialPin);
21.   int intensity= map(value, 0, 1023, 0,255);
22. 
    
23.             // check if the switch is pressed.
24.   if (switchState == HIGH) {     
25.             // turn motor on:    
26.             // digitalWrite(motorPin, HIGH);
27.     analogWrite(motorPin, intensity);
28.   } 
29.   else {
30.              // turn motor off:
31.     digitalWrite(motorPin, LOW); 
32.   }
33. }