CNX Software – Embedded Systems News

Raspberry Pi How-tos

The Raspberry Pi is by far the most popular ARM Linux hobbyist board with over 10 million pieces already sold. There are plenty of how-to and tutorials on the web, notably on elinux.org, so I won’t try to list all Raspberry Pi tutorials available, but instead will only list the few I’ve done in this blog.

Start Playing with Raspberry Pi without the Raspberry Pi

I took a while before the Raspberry Pi became easily available, with lead times over 2 months common at the time of launch. So I wrote some post to get started before you receive the hardware by running a similar system in QEMU (Quick EMUlator):

The last two instructions can still be used but were written in early 2012, so you may want to download newer images to give it a try.

Minimal Images for Raspberry Pi

When I worked a few years ago, I spend some time optimizing firmware to reduce its footprint, which cheap memory storage this becomes less relevant for consumer products, but can still be useful for cost-sensitive applications, and for training purposes. I did three posts explaining how to create with minimal images without a desktop environment and extra packages:

Other Raspberry Pi How-tos

Once I had my minimal Raspbian image as mention in the previous section, I explained how to install WordPress in my Raspberry Pi on top of Nginx. Installing APC: sudo apt-get install apc, and configuring W3 Total Cache to use APC Object Cache will boost performance further.

The Raspberry Pi developers added VP6, VP8, MJPEG, and OGG Theora software decoding support at the beginning of 2013. At the time, it required to build omxplayer yourself, so I provided instructions to build omxplayer using the Raspberry Pi rootfs as an NFS share.

A few months, later I wrote another post about media playback, a bit less technical, explaining how to install OpenElec 3.0.0 on the Raspberry Pi.

When the Raspberry Pi foundation launched its camera module, I wrote a Raspberry Pi camera tutorial using the information I gathered on the Internet.

I wanted a case for my Raspberry Pi, something cheap that would also allow me to easily add extra boards. There was nothing on the market for this purpose, so I decided to create my own modular Raspberry Pi enclosure using perfboards, the total BoM cost was $7.30, which was definitely on the low-cost side, even it required some efforts. After that, I added a relay and some LEDs to the perfboards to show the modular concept of this RPi case, and control these with the minimal Yocto image.

Bluetooth Low Energy (BLE) is one of the exciting new technological development that took place this year, and I wanted to play around a bit to I bought Texas Instruments SensorTag ($25) and explained how to control this BLE device with a Raspberry Pi.

The Raspberry Pi 4 is the fastest Raspberry Pi around (in 2019), but is it fast enough for your needs? Not to worry, as you can learn how to overclock Raspberry Pi 4 to 2.0 GHz and beyond to extract extra performance.

You may not always have physical access to the Raspberry Pi, or some Raspberry Pi products may feature a custom user interface that makes screenshotting difficult or impossible. To work around this issue, I explain how to take remote screenshots on Raspberry Pi SBC.

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