pilotak / beeper

Mbed library for simplification of toggling the output pin in time pattern.

Beeper

Mbed library for simplification of toggling the output pin in time pattern ie.: buzzer/LED or it can be used as morse code generator

You can choose built-in tone duration or you can specify your own. All time units are in millisecods with bit gain 16. That means if you want to turn on the output for 16ms you would write it as 1 (32ms = 2, 64ms = 3, etc.), this technique saves the RAM because the "pattern" will be stored in 8-bit array - this has of course a limitation of maximum tone length to 4080ms.

Please note: Pause is reserved "tone duration" in which no tone is played therefore the other tones can't have this duration. You can change this constant through mbed_app.json please see bellow.

Example

#include "mbed.h"
#include "Beeper.h"

Beeper beeper(PB_6);

const uint8_t oneshot[] = {Beeper::Short, Beeper::Pause, Beeper::Short};
const uint8_t pattern[] = {Beeper::Long, Beeper::Short, Beeper::Pause, Beeper::Short};

int main() {
    // this pattern will be played only once
    beeper.pattern(oneshot, sizeof(oneshot));
    // give a time to play because previous cmd is asynchronous
    ThisThread::sleep_for(5s);

    // this pattern will be played in loop until you stop it
    beeper.pattern(pattern, sizeof(pattern), true);
    ThisThread::sleep_for(20s);

    // stop the pattern
    beeper = 0;
    return 0;
}

How to change Pause duration

Remember that the value will be multiplied by 16 as a result. Total "silence" time: (50 * 16) + (2 * 160ms) (delay between tones) = 1120ms

mbed_app.json

{
  "target_overrides": {
    "*": {
      "beeper.pause": 50
    }
  }
}