Push button

From Sketching with Hardware at LMU Wiki
Jump to navigation Jump to search

Description

With a button we can select which of the two sides are connected to the middle. It is similar to a switch but it only stays in the state as long as it is pressed.

Button02.PNG

How to connect it electrically

This is the most simple way of connecting a button. if the button is not pressed (open) there is no signal at the pin. Hence here we should use an internal pullup resistor.

Button01.PNG


This is the connection of a button with a pullup resistor. If the button is not pressed, 3.3V are connected to the pin via the 10 KOhm resistor (reads 1). if it is pressed it is connected to GND (reads 0).

Pullup02.PNG

How to control it in MicroPython

== Simple digital read on pin 26 with internal Pull-up

1 from machine import Pin
2 in26 = Pin(26, Pin.IN, Pin.PULL_UP)
3 print(in26.value())

Simple digital read on pin 26

1 from machine import Pin
2 in26 = Pin(26, Pin.IN)
3 print(in26.value())

Related Tutorial Videos

Digital Input