Breath LED that turn on/off or loop the brightness smoothly.

Dependents:   BreathLed-demo EPD_GDE021A1_demo mbed_esp8266_demo NUCLEO_uart_flow_control


This breathing-led uses Ticker and PWM which consumes few CPU, and most important, you can use it to tell system hang.

Just init it with a PWM pin which connected to a LED.

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