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Data Acquisition Using LabVIEW by Behzad Ehsani

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Duty cycle and PWM

Pulse-Width Modulation, or PWM,  basically creates a pseudo analog voltage. In reality, PWM is a square wave where the percentage of the time where the signal is up versus the time the signal is down, called the duty cycle is varied, therefore and in effect one would get a variable voltage. In the following example, we will create a variable duty cycle; using the PWM capabilities of an Arduino compatible device called Uno32. This board is officially called "chipKIT Uno32 Prototyping Platform" and it is based on Microchip® PIC32MX320F128 and an original Arduino development environment. National Instrument is the parent company of Digilent®, the original manufacturer of this board. The board runs at 80 Mhz, but it has a 32 bit ...

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