A Pulse-width modulation (PWM) or duty-cycle variation methods are commonly used in speed control of DC motors. The duty cycle is defined as the percentage of digital 'high' to digital 'low' plus digital 'high' pulse-width during a PWM period. Range upto 255.
The app is terminal application, it can transaction data between Bluetooth device. it's can save all send and receive data to file. Display hexadecimal : show data of hexadecimal format.