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Voltage is the difference in electric potential between two points of an electric circuit, measured in Volts (V). Voltage can be constant (DC) or varying (AC).

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transistors. The logic levels are Low: 0 V to 1/3 VDD and High:2/3 VDD where VDD is the supply voltage. This information can be found here. So, if your processor is designed to operate at 5 volts and is … likely made of CMOS logic gates, the low level voltage is from 0 to 1.67 volts and the high level voltage is from 3.33 to 5 volts. But to address your question specifically: Digital input pins do …
answered Oct 16 '17 by st2000