NewToneLib is a simple library, intended for devices which do not support built-in tone() function.
NOTE: tone() function does not support using multiple pins simultaneously.
Tested on the following devices:
-NodeMCU v1.0(ESP-12E) with ESP8266
-Arduino Due
Feel free to report any issues you encounter with the library and test on another devices.
Any help would be appreciated. :)
created: January 2020
by Yordan Yordanov, BG