课程: Learning Arduino: Foundations

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Active low, active high

Active low, active high - Arduino教程

课程: Learning Arduino: Foundations

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Active low, active high

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- [Instructor] Now in order to add a switch or a push button to Arduino, we use two methods. A pullup circuit or a pulldown circuit. If we are using switch or push button, we usually refer to them as an active high switch or push button or an active low switch or push button. This is the arrangement of active high and active low. In active high arrangement we are using a pulldown resistor. In active low arrangement we are using a pullup resistor. So now let's try to understand the differences between them. The first type is a pullup circuit or an active low circuit. This is the arrangement for an active low push button. We have a voltage source, VCC and a resistor. The resistor is called a pullup resistor, then a push button or switch connected to ground. And to read the value of the active low push button, we connect the controller Arduino pin between the pullup resistor and the push button. Active low simply…

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