Few microcontrollers include a DAC. Although you can easily find an inexpensive DAC to control from your microcontroller, you can use unused peripherals instead of adding parts. Fortunately, you can convert a microcontroller's ADC channel along with a GPIO (general-purpose input/output) pin into a DAC. You can make a DAC by charging a capacitor to an analog level by driving it high. You can also discharge the capacitor by driving it low, or you can hold its voltage by tristating it (Few microcontrollers include a DAC. Although y
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Create a DAC from a microcontroller's ADC
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