Lesson 2-1: the switch Debouncing.

Hello!

I have a question around the use of the switch on a GPIO PIN.

When I worked with Arduino Uno, I used to refer to this tutorial to debounce switch. The following is an excerpt from the tutorial (underlining).

This example shows how to debounce a entry, which means check twice in a short period of time to ensure that she is certainly in a hurry. Without debouncing, by pressing the button once can appear as several presses code. Uses the millis() function to keep track of the time when the button is pressed.

I'm curious as to why it has not taken into account in this lesson. Conversely, suppose, I want to keep the LED lit until you press. How would one implement?

Kind regards

Nanga

Hi nanou -.

Curious - where do you see the content of 2-1 lesson?  I haven't posted the content for the course may yet - it's path of March?

First of all, the Raspberry Pi has integrated circuits to eliminate some of the rebound, and so I have not really known to bounce with the switches that we use in the course. That said, take a look at this post for ideas on how to do it in software.

Conversely, suppose, I want to keep the LED lit until you press. How would one implement?

Set the PIN for LED raw and on the spindle attached to the switch, look for a transition from State of low to high (TRIGGER_RISING_EDGE). Add a PinListener to the swichpin and when the button is pressed, you will get an event and valueChanged is called. Set the low LED in this method.

Does that help?

Tom

Tags: Java

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