TCCR1B = TCCR1B & B11111000 | B00000001; // set timer 1 divisor to 1 for PWM frequency of 31372.55 Hz
pinMode(PWMPin,OUTPUT); //该端口需要选择有#号标识的数字口
}
void loop()
{
char c;
while (Serial.available() > 0)
{
c=Serial.read();
if (']'==c)
{
n=n+5;
}
if ('['==c)
{
n=n-5;
}
if (n>255) {n=0;}
if (n<0) {n=255;}
analogWrite(PWMPin,n);
Serial.println(n);
}
}
占空比245
参考:
1. http://www.diyleyuan.com/index.p ... catid=29&id=616
2. https://arduino-info.wikispaces.com/Arduino-PWM-Frequency
3. // For Arduino Uno, Nano, Micro Magician, Mini Driver, Lilly Pad and any other board using ATmega 8, 168 or 328**
4.
5. //---------------------------------------------- Set PWM frequency for D5 & D6 -------------------------------
6.
7. //TCCR0B = TCCR0B & B11111000 | B00000001; // set timer 0 divisor to 1 for PWM frequency of 62500.00 Hz
8. //TCCR0B = TCCR0B & B11111000 | B00000010; // set timer 0 divisor to 8 for PWM frequency of 7812.50 Hz
9. TCCR0B = TCCR0B & B11111000 | B00000011; // set timer 0 divisor to 64 for PWM frequency of 976.56 Hz (The DEFAULT)
10. //TCCR0B = TCCR0B & B11111000 | B00000100; // set timer 0 divisor to 256 for PWM frequency of 244.14 Hz
11. //TCCR0B = TCCR0B & B11111000 | B00000101; // set timer 0 divisor to 1024 for PWM frequency of 61.04 Hz
12.
13.
14. //---------------------------------------------- Set PWM frequency for D9 & D10 ------------------------------
15.
16. //TCCR1B = TCCR1B & B11111000 | B00000001; // set timer 1 divisor to 1 for PWM frequency of 31372.55 Hz
17. //TCCR1B = TCCR1B & B11111000 | B00000010; // set timer 1 divisor to 8 for PWM frequency of 3921.16 Hz
18. TCCR1B = TCCR1B & B11111000 | B00000011; // set timer 1 divisor to 64 for PWM frequency of 490.20 Hz (The DEFAULT)
19. //TCCR1B = TCCR1B & B11111000 | B00000100; // set timer 1 divisor to 256 for PWM frequency of 122.55 Hz
20. //TCCR1B = TCCR1B & B11111000 | B00000101; // set timer 1 divisor to 1024 for PWM frequency of 30.64 Hz
21.
22. //---------------------------------------------- Set PWM frequency for D3 & D11 ------------------------------
23.
24. //TCCR2B = TCCR2B & B11111000 | B00000001; // set timer 2 divisor to 1 for PWM frequency of 31372.55 Hz
25. //TCCR2B = TCCR2B & B11111000 | B00000010; // set timer 2 divisor to 8 for PWM frequency of 3921.16 Hz
26. //TCCR2B = TCCR2B & B11111000 | B00000011; // set timer 2 divisor to 32 for PWM frequency of 980.39 Hz
27. TCCR2B = TCCR2B & B11111000 | B00000100; // set timer 2 divisor to 64 for PWM frequency of 490.20 Hz (The DEFAULT)
28. //TCCR2B = TCCR2B & B11111000 | B00000101; // set timer 2 divisor to 128 for PWM frequency of 245.10 Hz
29. //TCCR2B = TCCR2B & B11111000 | B00000110; // set timer 2 divisor to 256 for PWM frequency of 122.55 Hz
30. //TCCR2B = TCCR2B & B11111000 | B00000111; // set timer 2 divisor to 1024 for PWM frequency of 30.64 Hz