У вашего броузера проблема в совместимости с HTML5
This is an iambic keyer based on Raspberry Pi 2 Model B+.
Software:
Operating system is Linux/Raspbian.
The keyer software is written in C with wiringPi library.
Hardware:
Rotaly encoder use one interrup for CW speed.
Paddle, encoder input A/B, sounder and monitor LED use six GPIOs.