Skip to main content

Featured Post

Product Design of a 4 wheel differential drive robot

Post a Comment

Getting started with GPIO (Testing GPIO with a multimeter)

There are 65 possible GPIO pins that you can control. Some of the GPIO pins are normally configured to different functions. Let's play with one of them.

Go to the beaglebone website and figure out the header pin corresponding to gpio23.


The gpio23 is mapped to the 13th header pin. In this tutorial we are testing the gpio23 output using a multimeter (Do not connect an LED directly to BBB IO pin).

First go to following directory

cd /sys/class/gpio/

Then make gpio23 available

echo 23 > export

A new directory will be created. Open gpio directory.

 cd gpio23

The direction of IO will be normally set as in (input).  To make it as output,

 echo out > direction

Then set the pin to high using

echo 1 > value

Measure the voltage at pin 13 of P8 header. If its 3.3 V then you are on the right track. Pin 1 and 2 will be ground. You can connect the negative terminal of multimeter to pin 1 or 2.

To set output as zero,

echo 0 > value

After finished with the tutorial unexport the gpio23 pin.

cd ..
echo 23 > unexport

To get a better idea refer this site.
Labels:

Comments

Post a Comment

Popular posts from this blog

Plymouth theme for Ubuntu

Bored of having the same boot animation screen again and again? There are plenty of Plymouth themes available out there. This is a theme I created by slicing some cool gif files I found online. You can download the theme and find the installation steps on my github account. ( https://github.com/krishnan793/PlymouthTheme-Cat )  The theme is created for Ubuntu 16.04. But this can be installed on previous versions with slight modification. If you have a slow computer then you can watch the whole animation loops. (The VM I used to record the screen was fast though. :))
Post a Comment
Read more

Serial Port Communication in Linux using Minicom

First of all install minicom using apt-get install minicom or directly download the .deb package from  https://packages.debian.org/sid/minicom  and install it using dpkg -i <package name> After install type minicom -s to setup the minicom for using your serial port. Select Serial Port Setup and type A to select serial device. It will be shown as /dev/modem replace modem with  your serial device. Press Enter twice to save. You can also setup boadrate and all those stuff in the Serial Port Setup. After that you can save your configurations. Select Save Setup as. Then type a name and press enter to save it. If you wan't to open your configuration later, type minicom <configuration name>
Post a Comment
Read more