Add 2 examples: BuzzerSweep, EncoderSound

BuzzerSweep requires the modulino buzzer, it is going to play a sound sweeping its frequency

EncoderSound requires the modulino buzzer and the modulino knob, the user can play with the knob to change the frequency of the sound played by the buzzer. The button of the knob will mute/unmute the system

Author: navalog

examples/BuzzerSweep/BuzzerSweep.ino

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+#include "Modulino.h"
+
+#define FREQUENCY_LOWEST 100      //Lowest frequency in hertz
+#define FREQUENCY_HIGHEST 8000    //Highest frequency in hertz
+#define FREQUENCY_STEP 10         //Each iteration changes frequency by this number
+
+ModulinoBuzzer buzzer;
+
+int frequency = FREQUENCY_LOWEST;
+String frequency_text = String(frequency) + " Hz";
+
+void setup() {
+  Serial.begin(115200);
+
+  //Inizialise modulinos
+  Modulino.begin();
+  buzzer.begin();
+
+  delay(100);
+}
+
+void loop() {
+  //Increase played frequency by the desired step.
+  //Start again if highest frequency has been played
+  frequency = frequency + FREQUENCY_STEP;
+  if (frequency > FREQUENCY_HIGHEST) {
+    frequency = FREQUENCY_LOWEST;
+  }
+
+  //Play the frequency on the buzzer
+  buzzer.tone(frequency, 1000);
+
+  //Convert the frequency value to string and add Hz
+  frequency_text = String(frequency) + " Hz";
+  Serial.println(frequency_text);
+}

examples/EncoderSound/EncoderSound.ino

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+#include "Modulino.h"
+
+#define FREQUENCY_DEFAULT 4000   //Starting frequency in hertz
+#define FREQUENCY_LOWEST 1       //Minimum frequency in hertz
+#define FREQUENCY_HIGHEST 20000  //Maximum frequency in hertz
+#define FREQUENCY_STEP 200       //How much the frequency changes when the knob is turned by 1 click
+#define CYCLE_WAIT_MS 25         //Amount of added delay between loop iterations
+
+//Create objects for modulinos
+ModulinoKnob encoder;
+ModulinoBuzzer buzzer;
+
+//Declare variables for the sketch
+int frequency = FREQUENCY_DEFAULT;    //frequency which will be played by the buzzer
+int actual_value = FREQUENCY_DEFAULT; //Current encoder value.
+int previous_value = actual_value;    //Previous encoder value.
+bool mute_status = false;             //To use the encoder button as an MUTE/PLAY button.
+
+String frequency_text = String(frequency) + " Hz";
+String encoder_text =  "(encoder value " + String(actual_value) + ")";
+String mute_text = "- now playing";
+
+void setup() {
+  Serial.begin(115200);
+
+  //Inizialise modulinos
+  Modulino.begin();
+  buzzer.begin();
+  encoder.begin();
+
+  //Wait for modulino encoder inizialization and set starting value
+  delay(100);
+  encoder.set(FREQUENCY_DEFAULT);
+}
+
+void loop() {
+  //Acquire encoder value
+  actual_value = encoder.get();
+
+  /*Check if the encoder value has changed with respect to previous
+    acquisition, if so increase/decrease the encoder value by the
+    desired FREQUENCY_STEP, then update the previous value variable
+  */
+  if (previous_value != actual_value) {
+    if (actual_value > previous_value) {
+      actual_value = actual_value + FREQUENCY_STEP;
+    } else {
+      actual_value = actual_value - FREQUENCY_STEP;
+    }
+
+    if (actual_value < FREQUENCY_LOWEST) {
+      actual_value = FREQUENCY_LOWEST;
+      encoder.set(FREQUENCY_LOWEST);
+    }
+    if (actual_value > FREQUENCY_HIGHEST) {
+      actual_value = FREQUENCY_HIGHEST;
+      encoder.set(FREQUENCY_HIGHEST);
+    }
+    encoder.set(actual_value);
+    previous_value = actual_value;
+  }
+
+  //Check if encoder has been pressed. In that case toggle
+  //mute status. Update mute text to diplay the MUTE/PLAY on serial
+  if (encoder.isPressed()) {
+    mute_status = !mute_status;
+    if (mute_status == false) {
+      mute_text = "- now playing";
+    } else {
+      mute_text = "- muted";
+    }
+  }
+
+  //Play the frequency on the buzzer only if the system is not muted.
+  if (mute_status == false) {
+    buzzer.tone(actual_value, 1000);
+  } else {
+    buzzer.noTone();
+  }
+
+  //Convert the frequency value to string and add Hz
+  frequency_text = String(frequency) + " Hz";
+
+  //Convert the encoder value to string
+  encoder_text = "(encoder value " + String(actual_value) + ")";
+
+  //Print each of the sensor values on serial
+  Serial.print(frequency_text + " ");
+  Serial.print(encoder_text + " ");
+  Serial.println(mute_text);
+
+  delay(CYCLE_WAIT_MS);
+}