Pi-blaster Improves Software PWM on Raspberry Pi: 
Without an external digital to analog converter circuit, getting pulse width modulation out of more than a single PWM pin on the Raspberry Pi could be achieved by writing your own code to set the pins high and low at the appropriate time (i.e. bitbanging). The solution isn’t perfect, however. [...]
Read the full article on MAKE
Without an external digital to analog converter circuit, getting pulse width modulation out of more than a single PWM pin on the Raspberry Pi could be achieved by writing your own code to set the pins high and low at the appropriate time (i.e. bitbanging). The solution isn’t perfect, however. [...]Read the full article on MAKE
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