In this example we look at another Wemos mini shield, this time its the buzzer_shield which as its name suggests is a basic buzzer. Its an MLT_8540.
The product page is https://wiki.wemos.cc/products:d1_mini_shields:buzzer_shield
Code
This example plays a few notes from a popular song
[codesyntax lang=”cpp”]
int buzzerPin=D5; //Buzzer control port, default D5 const int songLength = 18; char notes[] = "cdfda ag cdfdg gf "; int beats[] = {1,1,1,1,1,1,4,4,2,1,1,1,1,1,1,4,4,2}; int tempo = 150; void setup() { pinMode(buzzerPin, OUTPUT); } void loop() { int i, duration; for (i = 0; i < songLength; i++) // step through the song arrays { duration = beats[i] * tempo; // length of note/rest in ms if (notes[i] == ' ') // is this a rest? { delay(duration); // then pause for a moment } else // otherwise, play the note { tone(buzzerPin, frequency(notes[i]), duration); delay(duration); // wait for tone to finish } delay(tempo/10); // brief pause between notes } while(true){} } int frequency(char note) { int i; const int numNotes = 8; // number of notes we're storing char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' }; int frequencies[] = {262, 294, 330, 349, 392, 440, 494, 523}; for (i = 0; i < numNotes; i++) // Step through the notes { if (names[i] == note) // Is this the one? { return(frequencies[i]); // Yes! Return the frequency } } return(0); }
[/codesyntax]
A very nice example :)))
Helps a lot!
Where are your includes? I do not see tone defined in your example.
Your example is not complete.
Doesn’t need the tone library
The buzzer can sound at between 1 kHz and 3 kHz, and by default is connected to digital pin 5.