Have you ever wanted to get the value of a voltage? You can use a microcontroller’s analog input to read discrete values rather than the 0s and 1s from a digital input. DevicePlus has a great tutorial that explains this concept in detail.
Arduino supports analog inputs to read these various voltages. Analog inputs enable you to read the state of electronic components that change gradually. For example, you can use volume to adjust brightness or loudness or a temperature sensor to get the current temperature.
Actual voltage is not an exact value such as 1V or 5V, but an irrational number, in which numerical values continue forever after the decimal point, such as 5.01342…V. These values cannot be directly handled by a computer. In electronic circuits, therefore, analog values are converted to digital values using a mechanism called AD converter so that the value can be handled by a computer. Arduino also has an AD converter by default, which can read analog voltages and convert them into digital values.
Eink, E-paper, Think Ink – Collin shares six segments pondering the unusual low-power display technology that somehow still seems a bit sci-fi – http://adafruit.com/thinkink
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