В момента ресурсът е наличен само на английски

Add a button to your car Pro Preview

We want to be able to interact with the car and its programs and we are going to add the simplest sensor, a button.

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  • #833
  • 09 Apr 2018

TL;DR

Connect two close pins of a button to pin 17 3.3V and to GPIO 26.

 

A button

There is a joke that if you don't know how a button works, you must be from the past.
What is interesting about that button is that it has 4 pins, and they are connected internally in pairs. Those four pins help with the mounting.
A button closes a circuit and electrical current flows from the first pin to the second.

 

Connect the button to the Raspberry Pi

One pin of a button must be connected to a GPIO pin, that is kind of expected. The other pin can be connected eighter to ground (GND), as a diode, or to 3.3V. Here we should start explaining about pull-up and pull-down resistors, but we are not going to. We will keep things simple and straightforward.

In order to simplify our Python code a few minutes later, we are going to connect the other end of the diode to pin 17 - 3.3V. The other pin goes to GPIO 26. 

Do you remember where to find an image with all the pins? Which section had the image in it? It is a vital skill to remember where to look things up. 
Use the navigation to the right, the section was something about connecting the driver to the Raspberry Pi. Open it in a new tab.

Signature,
/ your friendly evil online teacher /

 

The end result

Here is a picture how a connected button looks like:

a button and led connected to raspberry pi

We have purposely folded the button pins to the side.

Курсове и занятия включващи този Урок

Този Урок е използван в следните курсове и занятия.

Image for Perfect STEM course. Module 1 - Smart Car with Raspberry PI
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