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RaspberryPi Pulse Width Modulation Demonstration This instructable is a demonstration of the settings used to control the hardware Pulse Width Modulation new pandora jewelry (PWM) on a RaspberryPi.
If you are just fading an LED the default settings are good enough, but if you are trying to control a servo, a stepping motor, or anything critical you will want to change some of the settings. The fact that the hardware PWM makes noise on the speakers is well documented. A more accurate way of stating it is "The RaspberryPi uses the audio pandora bead necklace circuitry to create the PWM signal". My PWM demonstration program uses the wiringPi libraries, written by Gordon Henderson, for programming the GPIO in C. wiringPi must be installed. All pin numbers are wiringPi numbers unless otherwise specified. When I specify a physical pin number I am referring to the pin number on the GPIO header. Pin pandora internet radio nz 1 is the only hardware PWM pin available on all RaspberryPi models.
It is physical pin number 12 on the GPIO header pandora rings online and it uses the right channel. Pin 24 is the second hardware PWM pin available on model B+ only. It is physical pin number 35 on the GPIO header, it uses the left channel.
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