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PWM Speaker
Der folgende Code gibt ein Beispiel für die Verwendung des Lautsprechers (Speaker) des mbed-Application-Board:
mbedESP32S_Speaker-PWM.ino
const int speaker = 12; // 12 corresponds to GPIO26 // setting PWM properties const int freq = 5000; const int spkrChannel = 0; const int resolution = 8; void setup(){ // configure spkr PWM functionalitites ledcSetup(spkrChannel, freq, resolution); // attach the channel to the GPIO to be controlspkr ledcAttachPin(speaker, spkrChannel); } void loop(){ // increase the spkr frequency for(int dutyCycle = 0; dutyCycle <= 255; dutyCycle++){ // changing the spkr brightness with PWM ledcWrite(spkrChannel, dutyCycle); delay(15); } // decrease the spkr frequency for(int dutyCycle = 255; dutyCycle >= 0; dutyCycle--){ // changing the spkr brightness with PWM ledcWrite(spkrChannel, dutyCycle); delay(15); } }