Analog Output
Abstract
This chapter starts by reviewing the main features of digital-to-analog conversion, with consideration given to the number of bits in the conversion, resolution, and the role of the voltage reference. The mbed digital-to-analog converter is introduced, and simple DC and saw tooth outputs generated. A sine wave is generated using the sine function from the math.h standard C library. The main concepts of pulse width modulation (PWM) are then introduced, followed by a consideration of the mbed PWM capability. PWM outputs are generated in a series of programs, for motor control, servo positioning, and audio tone generation. PWM is also generated in a software loop, demonstrating that dedicated hardware is not essential. ...
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