Rtttl Buzzer

The rtttl, component allows you to easily connect a passive piezo buzzer to your microcontroller and play monophonic songs. It accepts the Ring Tone Text Transfer Language, rtttl format (Wikipedia) which allows to store simple melodies.

../_images/buzzer.jpg

Buzzer Module

Overview

It’s important that your buzzer is a passive one, if it beeps when you feed it with 3.3V then it is not a passive one and this library will not work properly.

The tone generator needs a PWM capable output to work with, currently only the ESP8266 Software PWM Output and ESP32 LEDC Output are supported.

# Example configuration entry
output:
  - platform: ledc
    pin: GPIO22
    id: rtttl_out

rtttl:
  output: rtttl_out

Configuration variables:

  • output (Required, ID): The id of the float output to use for this buzzer.

  • id (Optional, ID): Manually specify the ID used for code generation.

  • on_finished_playback (Optional, Automation): An action to be performed when playback is finished.

rtttl.play Action

Plays an rtttl tone.

on_...:
  then:
    - rtttl.play: 'MissionImp:d=16,o=6,b=95:32d,32d#,32d,32d#,32d,32d#,32d,32d#,32d,32d,32d#,32e,32f,32f#,32g,g,8p,g,8p,a#,p,c7,p,g,8p,g,8p,f,p,f#,p,g,8p,g,8p,a#,p,c7,p,g,8p,g,8p,f,p,f#,p,a#,g,2d,32p,a#,g,2c#,32p,a#,g,2c,a#5,8c,2p,32p,a#5,g5,2f#,32p,a#5,g5,2f,32p,a#5,g5,2e,d#,8d'

Configuration options:

  • play (Required, string, templatable): The rtttl string.

You can find many rtttl strings online on the web, they must start with a name, then a colon: : symbol and more codes of the song itself. Tip: you can try playing with the values of d=16,o=6,b=95 and make the song play at a different pace or pitch, e.g. setting o=7 instead will cause the song to play on a higher pitch.

rtttl.stop Action

Stops playback.

on_...:
  then:
    - rtttl.stop

All actions

  • id (Optional, ID): Manually specify the ID of the rtttl if you have multiple components.

rtttl.is_playing Condition

This Condition returns true while playback is active.

# In some trigger:
on_...:
  if:
    condition:
      rtttl.is_playing
    then:
      logger.log: 'Playback is active!'

Common beeps

You can do your own beep patterns too! Here are a few I made so you can just use right away or tweak them to your like:

two short:d=4,o=5,b=100:16e6,16e6
long:d=1,o=5,b=100:e6
siren:d=8,o=5,b=100:d,e,d,e,d,e,d,e
scale_up:d=32,o=5,b=100:c,c#,d#,e,f#,g#,a#,b

Test setup

With the following code you can quickly setup a node and use Home Assistant’s service in the developer tools. E.g. for calling rtttl.play select the service esphome.test_esp8266_rtttl_play and in service data enter

song_str: "mario:d=4,o=5,b=100:16e6,16e6,32p,8e6,16c6,8e6,8g6,8p,8g,8p,8c6,16p,8g,16p,8e,16p,8a,8b,16a#,8a,16g.,16e6,16g6,8a6,16f6,8g6,8e6,16c6,16d6,8b,16p,8c6,16p,8g,16p,8e,16p,8a,8b,16a#,8a,16g.,16e6,16g6,8a6,16f6,8g6,8e6,16c6,16d6,8b,8p,16g6,16f#6,16f6,16d#6,16p,16e6,16p,16g#,16a,16c6,16p,16a,16c6,16d6,8p,16g6,16f#6,16f6,16d#6,16p,16e6,16p,16c7,16p,16c7,16c7,p,16g6,16f#6,16f6,16d#6,16p,16e6,16p,16g#,16a,16c6,16p,16a,16c6,16d6,8p,16d#6,8p,16d6,8p,16c6"

Sample code

esphome:
  name: test_esp8266
  platform: ESP8266
  board: nodemcuv2

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_pass

output:
  - platform: esp8266_pwm
    pin: D1
    id: rtttl_out

rtttl:
  output: rtttl_out
  on_finished_playback:
    - logger.log: 'Song ended!'

api:
  services:
    - service: play_rtttl
      variables:
        song_str: string
      then:
        - rtttl.play:
            rtttl: !lambda 'return song_str;'