PlayRtttl

Available as Arduino library "PlayRtttl"

Version 1.4.2

Improved Arduino library version of the RTTTL.pde example code written by Brett Hagman http://www.roguerobotics.com/ bhagman@roguerobotics.com

• Plays RTTTL melodies/ringtones from FLASH or RAM.
• Non blocking version.
• Name output function.
• Sample melodies.
• Random play of melodies from array.
• Supports inverted tone pin logic i.e. tone pin is HIGH at playing a pause.
• Accepts even invalid specified RTTTL files found in the wild.
• Supports RTX format - 2 additional parameters: 1. l=<number_of_loops> 2.s=<Style[N|S|C]>).
• Tone style (relation of tone output to note length) and loop count can be set for a melody.

YouTube video of the RandomMelody example in action

WOKWI online simulation of the RandomMelody example

.

Sample code

Blocking play melody from FLASH

#include <PlayRtttl.h>
const int TONE_PIN = 11;
...
    playRtttlBlockingPGM(TONE_PIN, Bond);
...

Non blocking play

...
    startPlayRtttlPGM(TONE_PIN, TakeOnMe);
    while (updatePlayRtttl()) {
        // your own code here...
        delay(1);
    }
...

Compile options / macros for this library

To customize the library to different requirements, there are some compile options / makros available.
Modify it by commenting them out or in, or change the values if applicable. Or define the macro with the -D compiler option for global compile (the latter is not possible with the Arduino IDE, so consider using Sloeber. Some options which are enabed by default can be disabled also by defining a inhibit macro like USE_NO_RTX_EXTENSIONS.

Macro	Default	File	Disable macro	Description
SUPPORT_RTX_EXTENSIONS	enabled	PlayRtttl.h	USE_NO_RTX_EXTENSIONS	Support loop and style. Even without SUPPORT_RTX_EXTENSIONS the default style is natural (Tone length = note length - 1/16). Requires around 182 additional bytes FLASH.
SUPPORT_RTX_FORMAT	enabled	PlayRtttl.h	USE_NO_RTX_EXTENSIONS	Enables evaluating RTX format definitions 's' and 'l'.
RTX_STYLE_DEFAULT	'N'	PlayRtttl.h		(Natural) Tone length = note length - 1/16.

Modifying compile options with Arduino IDE

First, use Sketch > Show Sketch Folder (Ctrl+K).
If you did not yet stored the example as your own sketch, then you are instantly in the right library folder.
Otherwise you have to navigate to the parallel libraries folder and select the library you want to access.
In both cases the library files itself are located in the src directory.

Modifying compile options with Sloeber IDE

If you are using Sloeber as your IDE, you can easily define global symbols with Properties > Arduino > CompileOptions.

Running with 1 MHz

If running with 1 MHz, e.g on an ATtiny, the millis() interrupt needs so much time, that it disturbes the tone() generation by interrupt. You can avoid this by using a tone pin, which is directly supported by hardware. Look at the appropriate pins_arduino.h, find digital_pin_to_timer_PGM[] and choose pins with TIMER1x entries.

More songs

More RTTTL songs can be found under http://www.picaxe.com/RTTTL-Ringtones-for-Tune-Command/ or ask Google. C array of songs on GitHub

Compiling for ATtinies

In order to fit the examples to the 8K flash of ATtiny85 and ATtiny88, the Arduino library ATtinySerialOut is required for this CPU's.

Revision History

Version 1.4.2

• New example ReactionTimeTestGame.

Version 1.4.1

• Removed blocking wait for ATmega32U4 Serial in examples.

Version 1.4.0

• Supporting direct tone output at pin 11 for ATmega328. Can be used with interrupt blocking libraries for NeoPixel etc.
• Use Print * instead of Stream *.
• Improved non-AVR compatibility.
• New Christmas songs example.

Version 1.3.0

• Support all octaves below 8
• New styles '1' to '9' in addition to RTX styles 'C', 'N', 'S'.

Version 1.2.2

• Tested with ATtiny85 and 167.
• Ported to non AVR architectures.

Version 1.2.1

• Natural is the new default style.
• New RTTTLMelodiesSmall sample array with less entries.
• Parameter now order independent.
• Modified OneMelody example.

Version 1.2.0

• No Serial.print statements in this library anymore, to avoid problems with different Serial implementations.
• Function playRandomRtttlBlocking() + startPlayRandomRtttlFromArrayPGM() do not print name now. If needed, use new functions playRandomRtttlSampleBlockingAndPrintName() + startPlayRandomRtttlFromArrayPGMAndPrintName().
• Printing functions have parameter (..., Stream *aSerial) to print to any serial. Call it (..., &Serial) using [Sloeber]tandard Serial;
• playRandomRtttlBlocking() renamed to playRandomRtttlSampleBlocking() and bug fixing.

Version 1.1.0

• RTX song format support.
• new setNumberOfLoops() and setDefaultStyle() functions.

Version 1.0.0

Initial Arduino library version

CI

Since Travis CI is unreliable and slow, the library examples are now tested with GitHub Actions for the following boards:

• arduino:avr:uno
• arduino:avr:leonardo
• arduino:avr:mega
• esp8266:esp8266:huzzah:eesz=4M3M,xtal=80
• esp32:esp32:featheresp32:FlashFreq=80
• STM32:stm32:GenF1:pnum=BLUEPILL_F103C8

Requests for modifications / extensions

Please write me a PM including your motivation/problem if you need a modification or an extension.

If you find this library useful, please give it a star.