Tag Archives: resistor

What are pull-up and pull-down resistors?

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Let’s take that example. If we try to read the voltage at v1, with our ATtiny micro-controller, surprisingly we can’t tell what the voltage will be. It may be at 0 Volts, sometimes, and 2.9 Volts or 4 Volts at other moments. It’s voltage is undefined and varies depending on what surrounds it, like any electromagnetic field. This is what… Read more »