Push button: Difference between revisions
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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. | 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. | ||
[[File:Button01.PNG] | [[File: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). | 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). | ||
[[File:Pullup02.PNG] | [[File:Pullup02.PNG]] | ||
= How to control it in MicroPython = | = How to control it in MicroPython = | ||
Revision as of 00:10, 30 August 2020
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.
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.
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).
How to control it in MicroPython
from machine import Pin
in26 = Pin(26, Pin.IN)
print(in26.value())
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Digital Input