In this video, Zahraa explains active high and active low arrangements that are used when connecting pushbuttons or switches to Arduino. Zahraa explains the difference by showing the differences and explaining pull-up and pull-down resistors.
- [Instructor] Now in order to add a switch…or a pushbutton to Arduino, we use two methods.…A pull-up circuit, or a pull-down circuit.…If we are using switch or pushbutton,…we usually refer to them…as an active high switch or pushbutton,…or an active low switch or pushbutton.…This is an arrangement of active high and active low.…In active high arrangement, we're using…a pull-down resistor.…In active low arrangement, we're using a pull-up resister.…
So now let's try to understand the differences between them.…The first type is a pull-up circuit…or an active low circuit.…This is an arrangement for an active low pushbutton.…We have a voltage source, VCC, and a resistor,…there is a series called a pull-up resistor,…then a pushbutton or a switch connected to ground.…And to read the value of the active low pushbutton,…we connect the controller, Arduino pin…between the pull-up resistor and the pushbutton.…
Active low simply means when the switch…or pushbutton is closed or pressed,…it sends a low signal to the microcontroller.…
- What's an Arduino?
- Creating an Arduino program
- Using the setup() and loop() functions
- Using the pinMode() and digitalWrite() commands
- Creating your first sketch
- Writing code to turn LEDs on and off
- Wiring a pushbutton to Arduino
- Activating an LED with a pushbutton
Skill Level Beginner
Learning Arduino: Interfacing with Hardwarewith Zahraa Khalil1h 40m Intermediate
Learning Arduino: Pulse Width Modulationwith Rae Hoyt1h 16m Intermediate
1. Introduction to Arduino
2. Creating an Arduino Program
3. Interface with Ouptut: LED
4. Interface with Input: Pushbutton
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