raspberry pi

1656 Articles

A Weather Station Fit For A PDP-11

March 31, 2019 by 11 Comments

The Digital Equipment Corp. PDP-11/70 is a masterpiece of Cold War-era industrial design. This microcomputer was the size of one or two modern server racks depending on configuration, and the front panel, loaded up with blinkenlights, was clad in a beautiful rose and magenta color scheme. The switches — the ones you used to toggle bits in memory — were actually custom designed covers made to match the shape of the completely unnecessary bezel. The aesthetic of the 11/70 is the intersection of baroque and modernism on the design Venn diagram.

[Oscar Vermeulen] built a miniature version of the PDP-11/70 that houses a Raspberry Pi, and [rricharz] has been hard at work bringing an original copy of BSD to this system. The first great project to come out of this effort? It’s a weather station, and it’s exactly as cool as you think it is.

A bit of ground work went into this build, including getting a historical Unix system up and running, in this case 2.11 BSD. Armed with a Pi and the PiDP-11/70 front panel, [rricharz] had a complete BSD system up and running, and with cool-retro-term, the interface looked the part. Doing something useful was another question entirely, but the Pi in the PiDP had some GPIOs free, so this ancient machine got an I2C temperature and pressure sensor.

The completed build is basically just a breadboard, a tiny diagnostic OLED, and a python script that grabs the data and sends it over to the sim. This is pressure and temperature data shoved into an emulation of a Tektronix 4010 terminal. It’s marginally useful work done by an ancient BSD system wrapped in an emulation on a Raspberry Pi. It doesn’t get better than that.

An Air Quality Monitor That Leverages The Cloud

March 28, 2019 by 9 Comments

Air quality has become an increasing concern in many urban areas, due to congestion and our ever-increasing energy use. While there are many organisations that task themselves with monitoring such data, it’s also something anyone should be able to take on  at home. [Chrisys] is doing just that, with some impressive logging to boot.

The build starts with a Raspberry Pi Zero W, which offers the requisite computing power and Internet connectivity in a compact low-power package. For determining air quality, the Bosch BME680 sensor is used. This offers temperature, pressure, and humidity readings, along with the ability to sense the presence of volatile organic compounds, or VOCs. These can be harmful to human health, so it’s useful to have an idea of the levels in your home.

The hardware is incredibly refined. It’s simple enough for the newbie, but just begs for the more experienced hacker to expand on.

On the software side, data is accessible through the Balena cloud service. Sensor readings are stored in an InfluxDB instance, with Grafana providing the visually attractive graphs and monitoring. It’s all very slick and Web 2.0, and can be accessed from anywhere through a web browser.

The project is a great example of combining a basic DIY Raspberry Pi setup with the right software tools to create a polished and effective end product. Of course, if you’re looking for something more portable, this project might be more your style. 

Here’s The First Person To Put A Pi In The Raspberry Pi Keyboard

March 24, 2019 by 49 Comments

Last week, the Raspberry Pi foundation released the first official Raspberry Pi-branded keyboard and mouse. As a keyboard, it’s probably pretty great; it’s clad in a raspberry and white color scheme, the meta key is the Pi logo, there are function keys. Sure, the Ctrl and Caps Lock keys are in their usual, modern, incorrect positions (each day we stray further from God’s light) but there’s also a built-in USB hub. Everything balances out, I guess.

The Pi keyboard started shipping this week, and it took two days for someone to put a Pi zero inside. Here’s how you do it, and here’s how you turn a Pi keyboard into a home computer, like a speccy or C64.

The parts required for this build include the official Pi keyboard, a Pi Zero W, an Adafruit Powerboost, which is basically the circuitry inside a USB power bank, and a LiPo battery. The project starts by disassembling the keyboard with a spudger, screwdriver, or other small wedge-type tool, disconnecting the keyboard’s ribbon cables, and carefully shaving down the injection molded webbing that adds strength to the keyboard’s enclosure. The project is wrapped up by drilling holes for a power LED, a button to turn the Pi on and off, and the holes for the USB and HDMI ports.

One shortcoming of this build is the use of a male-to-male USB cable to connect the keyboard half of the circuitry to the Pi. This can be worked around by simply soldering a few pieces of magnet wire from the USB port on the Pi to the USB input on the USB hub. But hey, doing it this way gives the Official Pi keyboard a convenient carrying handle, and when one of the ports breaks you’ll be able to do it the right way the second time. Great work.

Raspberry Pi Tracks Humans, Blasts Them With Heat Rays

March 22, 2019 by 23 Comments

Given how long humans have been warming themselves up, you’d think we would have worked out all the kinks by now. But even with central heating, and indeed sometimes because of it, some places we frequent just aren’t that cozy. In such cases, it often pays to heat the person, not the room, but that can be awkward, to say the least.

Hacking polymath [Matthias Wandel] worked out a solution to his cold shop with this target-tracking infrared heater. The heater is one of those radiant deals with the parabolic dish, and as anyone who’s walked past one on demo in Costco knows, they throw a lot of heat in a very narrow beam. [Matthias] leveraged a previous project that he whipped up for offline surveillance as the core of the project. Running on a Raspberry Pi with a camera, the custom software analyzes images and locates motion across the width of a frame. That drives a stepper that swivels a platform for the heater. The video below shows the build and the successful tests; however, fans of [Matthias] should prepare themselves for a shock as he very nearly purchases a lazy susan to serve as the base for the heater rather than building one.

We’re never disappointed by [Matthias]’ videos, and we’re always impressed by his range as a hacker. From DIY power tools to wooden logic circuits to his recent Lego chocolate engraver, he always finds ways to make things interesting.

Continue reading “Raspberry Pi Tracks Humans, Blasts Them With Heat Rays” →

A Raspberry Pi Terminal Fit For Fallout 76

March 19, 2019 by 26 Comments

The Fallout series of video games provide a wonderful alternative history that answers the question of what might have happened had the microchip never been invented. Yes, most things run on tubes, and apparently you can implement an AI that passes a Turing test in tubes (does the Turing test apply if you’re comparing it against NPCs?). Of course, as with all of computer history, the coolest parts of Fallout are the computer terminals, so [Pigeonaut] decided to build one. All the files are available, and if you have a Pi sitting around this is a good weekend project.

This terminal has a host of features that are well-suited for the modern vault dweller. Of note, the entire case is 3D printed, in multiple pieces. Sure, considering the display is an LCD it’s a tiny bit thick, but you don’t get the Atomic age aesthetic without a big CRT, do you? The keyboard is a standard, off-the-shelf mechanical keyboard for clicky goodness with vintage-style keycaps. There’s a 3.5″ USB floppy drive, because there’s nothing that will survive a nuclear holocaust like magnetic media. The rest of the build is a Raspberry Pi 3B+, which is more than enough compute power to open a door shaped like a gear.

As for what you would do with a retro-inspired Pi terminal, well, it would make a good computer for the workbench, and since the case is already designed for a 3.5″ drive, you could use this to archive some old media. If there’s one thing the apocalypse tells us, it’s that these old terminals will still be kicking after a few hundred years.

Hands-On: New Nvidia Jetson Nano Is More Power In A Smaller Form Factor

March 18, 2019 by 55 Comments

Today, Nvidia released their next generation of small but powerful modules for embedded AI. It’s the Nvidia Jetson Nano, and it’s smaller, cheaper, and more maker-friendly than anything they’ve put out before.

The Jetson Nano follows the Jetson TX1, the TX2, and the Jetson AGX Xavier, all very capable platforms, but just out of reach in both physical size, price, and the cost of implementation for many product designers and nearly all hobbyist embedded enthusiasts.

The Nvidia Jetson Nano Developers Kit clocks in at $99 USD, available right now, while the production ready module will be available in June for $129. It’s the size of a stick of laptop RAM, and it only needs five Watts. Let’s take a closer look with a hands-on review of the hardware.

Continue reading “Hands-On: New Nvidia Jetson Nano Is More Power In A Smaller Form Factor” →

Forbes Says The Raspberry Pi Is Big Business

March 18, 2019 by 45 Comments

Not that it’s something the average Hackaday reader is unaware of, but the Raspberry Pi is a rather popular device. While we don’t have hard numbers to back it up (extra credit for anyone who wishes to crunch the numbers), it certainly seems a day doesn’t go by that there isn’t a Raspberry Pi story on the front page. But given that a small, cheap, relatively powerful, Linux computer was something the hacking community had dreamed of for years, it’s hardly surprising.

But how popular is the Raspberry Pi among people who don’t necessarily spend their free time reading weird black-background websites? Well, according to a recent article in Forbes, the Pi has been spotted putting in an honest days work all over the world. From factories to garbage trucks, everyone’s favorite Linux computer has come a long a way from its humble beginnings. How does it feel knowing a $35 computer has a longer resume than you do?

Unfortunately, the Forbes article doesn’t have the sort of deep technical details we’re used to around these parts. The fact that the article opens by describing the Raspberry Pi as a “stripped-down circuit board covered with metal pins and squares” should tell you all you need to know about the overlap between Forbes and Hackaday readers, but we think author [Parmy Olson] still tells an story interesting regardless.

So where has the Pi been seen punching a clock? At Sony, for a start. The consumer electronics giant has been installing Pis in several of their factories to monitor various pieces of equipment. They record everything from temperature to vibration and send that to a centralized server using an in-house developed protocol. Some of the Pis are even equipped with cameras which feed into computer vision systems to keep an eye out for anything unusual.

[Parmy] also describes how the Raspberry Pi is being used in Africa to monitor the level of trash inside of garbage bins and automatically dispatch a truck to come pick it up for collection. In Europe, they’re being used to monitor the health of fueling stations for hydrogen powered vehicles. All over the world, businesses are realizing they can build their own monitoring systems for as little as 1/10th the cost of turn-key systems; with managers occasionally paying for the diminutive Linux computers out of their own pocket.

The impact the Pi has had on the hardware world is difficult to overstate. It’s redefined the status quo for single board computers, and with the platform continuing to evolve, there’s no sign its incredible journey is slowing down anytime soon.

[Thanks to Itay for the tip.]