Switches and push buttons: Difference between revisions
From wikiluntti
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Three methods to wire | Three methods to wire | ||
# Internal resistor (20k-50k Ω): Use <code>INPUT_PULLUP</code> in setup <code>pinMode( Button_pin, INPUT_PULLUP);</code>. The default value is <code>HIGH</code> (1) and by pressing the button the state goes to <code>LOW</code>. | # Internal resistor (20k-50k Ω): Use <code>INPUT_PULLUP</code> in setup <code>pinMode( Button_pin, INPUT_PULLUP);</code>. The default value is <code>HIGH</code> (1) and by pressing the button the state goes to <code>LOW</code>. | ||
# | # External pullup or pulldown resistor: Use <code>pinMode( Button_pin, INPUT);</code> in the setup. | ||
# The bad method: | # The bad method: | ||
Revision as of 12:19, 23 July 2023
Introduction
Theory A: Simple switch
Theory B: Push Button
A double pole single throw push button micro switch (DPST) is a widely used button. Push button switches are often color coded to indicate their function.
Three methods to wire
- Internal resistor (20k-50k Ω): Use
INPUT_PULLUPin setuppinMode( Button_pin, INPUT_PULLUP);. The default value isHIGH(1) and by pressing the button the state goes toLOW. - External pullup or pulldown resistor: Use
pinMode( Button_pin, INPUT);in the setup. - The bad method:
