lcamtuf’s thing discuss digital-to-analog (DAC) and analog-to-digital converter (ADC) techniques:
…microcontrollers are eating the world. Even for rudimentary tasks, such as blinking a LED, a microcontroller is now cheaper and simpler to use than an oscillator circuit built with discrete components — or implemented using the once-ubiquitous 555 timer chip.
But in this increasingly software-defined world, zeroes and ones don’t always cut it. I In the end, almost every non-trivial digital circuit needs specialized digital-to-analog and analog-to-digital converters to interface with the physical world. These devices are often baked onto the die of the microcontroller, but they are still worth learning about.
Read how DACs and ADCs are constructed in the article here.
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