A Complete Raspberry Pi Power Monitoring System

July 24, 2020 by Tom Nardi 60 Comments

As the world has become more environmentally conscious, we’ve seen an uptick in projects that monitor or control home energy use. At a minimum one of these setups involves a microcontroller and some kind of clamp-on current sensor, but if you’re looking for resources to take things a bit farther, this Raspberry Pi energy monitoring system created by [David00] would be a great place to start.

This project includes provides software and hardware to be used in conjunction with the Raspberry Pi to keep tabs on not just home energy consumption, but also production if your home has a solar array or other method of generating its own power. Data is pulled every 0.5 seconds from a MCP3008 ADC connected to up to ~~five~~ six current sensors to provide real-time utilization statistics, and visualized with Grafana so you can see all of the information at a glance.

While [David00] has already done the community a great service by releasing the hardware and software under an open source license, he’s also produced some absolutely phenomenal documentation for the project that’s really a valuable resource for anyone who wants to roll their own monitoring system. He’s even offering hardware kits for anyone who’s more interested in experimenting with the software side of things than building the PCB.

Home energy monitoring projects are certainly nothing new, but the incredible advances we’ve seen in the type of hardware and software available for DIY projects over the last decade has really pushed the state-of-the-art forward. With so many fantastic resources available now, the only thing standing between you and your own home energy monitoring dashboard is desire and a long weekend.

3D Printed ESP8266 TV Is A Blast From The Past

July 23, 2020 by Tom Nardi 16 Comments

We’ve often said that one of the best applications for desktop 3D printing is the production of custom enclosures, but you certainly aren’t limited to an extruded version of the classic Radio Shack project box. As [Marcello Milone] shows with this very clever retro TV enclosure for the Wemos D1 Mini, 3D printing means your imagination is the only limit when it comes to how you want to package up your latest creation.

As nice as the printed parts are, it’s the little details that really sell the look. [Marcello] has bent a piece of copper wire into a circle to make a faux antenna with vintage flair, and while the ESP is connecting to the WiFi network, it even shows an old school TV test pattern on its 1.8″ TFT display.

In the video after the break you can see the device go through its startup routine, and while displaying the Hackaday Wrencher at boot might not be strictly on theme…we’ll allow it.

While you could certainly use this little enclosure for whatever ESP project you had in mind, [Marcello] says he’s building a distributed environmental monitoring network using HTU21D temperature and humidity sensors. It sounds like he’s still working on the software side of things though, so hopefully he posts an update when the functionality is fully realized.

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Custom Weather Camera Feed With Software Tricks

July 23, 2020 by Tom Nardi 4 Comments

With a gorgeous view of the Italian seaside, we’re not surprised [Danilo Larizza] had a couple IP cameras set up to pull in real-time views. But using a Raspberry Pi, an environmental sensor, and some software trickery to overlay the current (and naturally, perfect) weather conditions over the images? Now he’s just teasing us.

Whatever his motives are, we have to admit that the end result is very nice. Especially when you find out that there’s no complex hardware or software at work here. An original Raspberry Pi is doing all the heavy lifting by pulling a frame from the external IP camera using ffmpeg, polling the I2C-connected BME280 temperature and humidity sensor with a Python script, and then producing a final snapshot with the environmental data laid over top using ImageMagick.

[Danilo] gives the exact commands he’s using for each step of the process, making it easy to follow along and see how everything comes together in the end. That also makes it much easier to adapt for your own purposes should you feel so inclined. Once you see how all the pieces fit together, where the data and images come from is up to you.

We’ve previously shown how some simple Python code can be used to turn your raw data into attractive images, and combining that with real-world photographs is an excellent way of turning a text file full of values into a display worth showing off.

Tiny Ethernet Switch Gets Even Smaller

July 23, 2020 by Tom Nardi 41 Comments

As a project gets more complicated, some kind of internal communication network is often used to that all of the various modules and sensors can talk with each other. For hardware hackers like us, that usually means SPI, I2C, or maybe even good old fashioned UART. But if you’re pushing a lot of data around, like live video feeds from multiple cameras, you’ll need something a bit faster than that.

Which is why [Josh Elijah] has created the SwitchBlox Nano, a three port 10/100 Ethernet switch that fits on a one inch square PCB. All you need to do is provide it with power, with a generous input range of 5 to 50 volts, connect your devices to the Molex Picoblade connectors on the board, and away you go. There’s even a 5 V 1 A regulated output you can use to run your downstream devices.

If you’ve got a feeling that you’ve seen something very similar on these pages earlier in the year, you’re not imagining things. Back in April we covered the original five port SwitchBlox in a post that garnered quite a bit of attention. In fact, [Josh] tells us that the design of this new switch was driven largely by the feedback he got from Hackaday readers. The Nano is not only smaller and cheaper than the original, but now maintains full electrical isolation between each port.

The average Hackaday reader is as knowledgeable as they are opinionated, and we’re glad [Josh] was able to put the feedback he received to practical use. We’re proud that our community has had a hand in refining successful commercial products like the Arduboy handheld game system and the Mooltipass hardware password keeper. Now it looks like we can add a tiny Ethernet switch to the list of gadgets we’ve helped push up the hill. Maybe we should get a stamp or something…

CBS Announces Functional Tricorder Replica For 2021

July 22, 2020 by Tom Nardi 61 Comments

It’s taken 54 years, but soon, you’ll finally be able to buy a fully-functional version of the tricorder from Star Trek. Announced on the official website for the legendary sci-fi franchise, the replica will be built by The Wand Company, who’ve previously produced a number of high-quality official Star Trek props as well as replicas for Doctor Who and the Fallout game series.

Admittedly, we’re not sure what a “fully-functional tricorder” actually is, mainly because the various on-screen functions of the device were largely driven by whatever bind Kirk and Spock managed to find themselves in that week. But the announcement mentions the ability to scan radio frequencies, pull in dynamic data from environmental sensors, and record audio. The teaser video after the break doesn’t give us any more concrete information than the announcement, but it does seem to confirm that we’ll be viewing said data on the device’s iconic flip-up display.

Now as the regular Hackaday reader knows, fans have been building extremely impressive “functional” tricorders for some time now. Unlike the sleek 24th century versions seen in Star Trek: The Next Generation, the original tricorder prop was rather clunky and offers plenty of internal volume for modern goodies. Cramming a Raspberry Pi, LCD, and a bunch of sensors into an inert replica is a relatively approachable project. So it will be interesting to see how the official version stacks up to what’s already been done by intrepid hackers and makers.

The official tricorder won’t be available until summer of 2021, but you can sign up to be notified when it’s your turn to beam one up. While the $250 USD sticker price might keep the more casual Trekkers at bay, it’s actually a bit cheaper than we would have assumed given the amount of time and money we’ve seen fans put into their own builds.

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The WISE In NEOWISE: How A Hibernating Satellite Awoke To Discover The Comet

July 22, 2020 by Tom Nardi 8 Comments

Over the last few weeks the media has been full of talk about NEOWISE, one of the brightest and most spectacular comets to ever pass through our solar system that you can still see if you hurry. While the excitement over this interstellar traveler is more than justified, it’s also an excellent opportunity to celebrate the Wide-field Infrared Survey Explorer (WISE) space telescope it was named after. The discovery of this particular comet is just the latest triumph in the orbiting observatory’s incredible mission of discovery that’s spanned over a decade, with no signs of slowing down anytime soon.

In fact, WISE has been operational for so long now that its mission has evolved beyond its original scope. When it was launched in December 2009 from California’s Vandenberg Air Force Base, its primary mission was scheduled to be completed in less than a year. But like many NASA spacecraft that came before it, WISE achieved its original design goals and found itself ready for a new challenge. Though not before it spent almost three years in hibernation mode as the agency decided what to do with it.

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Hand Depanelizer Gets Pneumatic Upgrade

July 21, 2020 by Tom Nardi 14 Comments

In high volume production, smaller PCBs are often “panelized” so that multiple copies can be shuffled through assembly as a single piece. Each board is attached to the panel with a few strategically placed tabs, not unlike the sprues in a plastic model kit. If you only have to separate a few boards you can simply cut them with a hand nipper, but when you’re doing hundreds or thousands of boards, it quickly becomes impractical.

Which is where [Clough42] found himself recently. Looking to improve the situation without breaking the bank, he decided to automate his trusty hand-held depanelizer tool. The basic idea was to build an actuator that could stand in for his own hand when operating the tool. He already had a pneumatic cylinder that he could power the device with, he just needed to design it.

In the video below, he walks the viewer though his CAD design process for this project. His first step, which is one that’s often overlooked by new players, is creating digital representations of the hardware he’s using. This allows him to quickly design 3D printed parts that have the proper dimensions and clearances to interface with his real-world components. Remember: it’s a lot easier to adapt your 3D model to the components on hand than the other way around.

With the appropriate valves, hoses, and a foot pedal attached to the pneumatic cylinder, he’s able to operate the cutter completely hands-free. He still has to manually move the panel around, but at least it saves him from the repetitive squeezing motion.

With a tool like this and a custom testing jig, you’ll be producing PCBs like the pros in no time.

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