Some of the analog devices are light, temperature and touch devices, microphone and accelerometer. This permits to interface all kinds of analog devices with microcontroller unit. To overcome this problem, microcontrollers use an A/D (analog to digital) conversion unit that helps change a voltage to a number. So, we cannot directly measure voltage from microcontrollers. For example, if the input is greater than 2.5 volts, then it will be treated as high, and if it is less than 2.5 volts, then it will be treated as low. They can only recognize high or low-level input pins. Most of the microcontrollers available in the market are digital in nature. In such signals, the first quantity of the signal is a voltage, whereas the next quantity of the signal can be anything like pressure, force, temperature and light accelerations. In nature, there are various electrical signals like analog, which means the time varying continuous signal.
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