Join Zahraa Khalil for an in-depth discussion in this video Introduction to the keypad interface, part of Learning Arduino: Interfacing with Hardware.
- [Narrator] A keypad is a common hardware interface…so let's see how we can set up one with our Arduino board.…The keypad type we're using is four by three…which means four rows and three columns.…Each point is a pushbutton arranged this way.…Each pushbutton is an active low type.…This is the arrangement for an active low pushbutton.…We have a voltage source, VCC, and a resistor.…We call the resistor a pull-up resistor,…then a pushbutton connected to ground.…
And in order to read the value of the active low pushbutton…we connect the controller pin between the pull-up resistor…and the pushbutton.…Active low simply means when the switch or the pushbutton…is closed or pressed, it sends a low signal…to the microcontroller.…So as the name says it, when it's active,…it sends a low signal.…When the switch is not pressed, it sends a high signal.…An active low pushbutton uses a pull-up resistor.…
It pulls up the value to high when it's not pressed.…The keypad is separated into rows and columns.…All columns and rows are active low.…
- Interfacing with an LCD screen
- Wiring and coding the LCD interface
- Displaying random numbers on the LCD
- Interfacing with a seven-segment LED component
- Cycling through LEDs
- Using a shift register to interface with a seven-segment LED
- Interfacing with a keypad
- Combining the LCD, keypad, and LED
Skill Level Intermediate
The devices used38s
1. Interface with an LCD
2. Interface with a 7-Segment LED Directly
3. Interface with a 7-Segment LED Using a Shift Register
4. Interface with a Keypad
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