Arduino ESP32 PWM 通过示波器对实际产生的波形测量

Posted 2021-12-16 perseverance52

Arduino ESP32PWM 通过示波器对实际产生的波形测量

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测试代码

          
  // the number of the LED pin
  const int ledPin = 16;  // 16 corresponds to GPIO16
  const int ledPin2 = 17; // 17 corresponds to GPIO17
  const int ledPin3 = 5;  // 5 corresponds to GPIO5
   
  // setting PWM properties
  const int freq = 10000;
  const int ledChannel = 0;
  const int resolution = 8;
    
  void setup()
    // configure LED PWM functionalitites
    ledcSetup(ledChannel, freq, resolution);
     
    // attach the channel to the GPIO to be controlled
    ledcAttachPin(ledPin, ledChannel);
    ledcAttachPin(ledPin2, ledChannel);
    ledcAttachPin(ledPin3, ledChannel);
  
    
  void loop()
    // increase the LED brightness
    for(int dutyCycle = 0; dutyCycle <= 255; dutyCycle++)   
      // changing the LED brightness with PWM
      ledcWrite(ledChannel, dutyCycle);
      delay(5);
    
   
    // decrease the LED brightness
    for(int dutyCycle = 255; dutyCycle >= 0; dutyCycle--)
      // changing the LED brightness with PWM
      ledcWrite(ledChannel, dutyCycle);   
      delay(5);
    
  
          

• 5KHz
  
• 10KHz
  
• 8KHz