Don’t Miss The Bus: A One-Day Build

October 23, 2017 by Dan Maloney 7 Comments

Sometimes the most satisfying hacks are those that spring from a situation where resources are limited, either by choice or by chance. Constraints tend to stir the creative juices.

Serial Hackaday poster [limpkin] limited himself to a one-day build with what he had on hand for this bus-route countdown timer. Full points for actually building something useful, and extra credit for making something to keep his wife from being late for work.

The principle is simple: scrape a web page to find out how much time is left before either of two busses leaves his wife’s stop, and display the number of minutes left on a huge LED display. The parts bin gave up everything needed, including an ESP8266, a boost converter, a charge controller, and the display and driver. We’re skeptical that the PCB was fabricated the same day; looks like [limpkin] is only counting the design and coding time in his 10-hour build. Still, it’s a testament to what’s possible with a deep inventory and the skills to put it to use.

Check out some of [limpkin]’s other hacks, like this Formula-E race car PCB or his adventures in laundry larceny. Oh, and he also used to write for Hackaday.

Hazardous Dollhouse Teaches Fire Safety

October 22, 2017 by Kristina Panos 20 Comments

Fire safety is drilled into us from a young age. And for good reason, too, because fire hazards are everywhere in the average home. Even a small fire can turn devastatingly dangerous in a matter of minutes. But how do you get kids to really pay attention to scary (and often boring) adult concepts? You can teach a kid to stop, drop, and roll until you’re blue in the face and still might not drive home the importance of fire prevention. Subjects like this call for child-sized visual aids that ignite imaginations.

That’s exactly what firefighters in Poznań, Poland did in collaboration with mlabs, a local software company. They built a mobile, interactive fire safety education tool that simulates common household fire hazards in great detail (translated). This is easily the most tricked-out dollhouse we’ve ever seen. The many different hazard scenarios are controlled via touchscreen using a custom-built application. At the tap of a button, the house becomes a total death trap. The lamp-lit hazards glow realistically and with varied intensity, and there is actual smoke coming out of them that triggers smoke detectors. Cameras embedded throughout the house provide a first-person view of the terror on a nearby monitor.

Almost no room is safe for the figurine family that lives inside this intricately detailed 1:12 scale dwelling. Dad’s in the kitchen standing idly by while food scorches on the stove. Grandma’s sitting on her bed upstairs, her forgotten cigarette burning a hole in the duvet. Daughter is overloading the electrical outlets in her bedroom with all her gizmos. Smoldering coals have spilled out from the toppled stove in the utility room.

This isn’t the first smart dollhouse we’ve seen, but it’s probably the most intriguing. The fire safety dollhouse was on display this week at POL-EKO-SYSTEM, an annual environmental fair in Poznań. Nowhere near Poland? Check out the video after the break.

Continue reading “Hazardous Dollhouse Teaches Fire Safety” →

The Web Clock You Can Control Over A LAN

October 22, 2017 by Inderpreet Singh 8 Comments

Not every project is meant to solve a new problem. Some projects can be an extension of an existing solution just to flex the geek muscles. One such project by [limbo] is the Web Clock 2.0 which is an internet-connected clock.

Yes, it uses a WEMOS D1 mini which is equipped with an ESP-12F (ESP8266) and yes, it uses an LCD with an I2C module to interface the two. The system works by connecting to the Google servers to get GMT and then offsets it to calculate the local time. It also has the hourly nagging chime to let you know that another precious hour of your life has gone and you need to set it up.

What [limbo] adds to the conventional functionality is a LAN application to send custom messages to the LCD. The software is called ‘Clock Commander’ and can be downloaded as a Windows binary through the source code is unavailable for now. Simply point it to the correct IP address and you can then send it commands to display stuff as well as control the sound. The project comes with Lua scripts and instruction how to DIY.

We imagine this can be used to create a custom geeky table clock or hack a digital coo-coo clock to drive your co-workers crazy at the press of a button. For those who are looking for something with lasers, check out the Laser Pointer Clock for a slightly more challenging build. Continue reading “The Web Clock You Can Control Over A LAN” →

Low-Budget Hydroformer Puts The Squeeze On Sheet Metal Parts

October 20, 2017 by Dan Maloney 22 Comments

Between manufacturing technologies like 3D-printing, CNC routers, lost-whatever metal casting, and laser and plasma cutters, professional quality parts are making their way into even the most modest of DIY projects. But stamping has largely eluded the home-gamer, what with the need for an enormous hydraulic press and massive machined dies. There’s more than one way to stamp parts, though, and the budget-conscious shop might want to check out this low-end hydroforming method for turning sheet metal into quality parts.

If hydroforming sounds familiar, it might be because we covered [Colin Furze]’s attempt, which used a cheap pressure washer to inflate sheet metal bubbles with high-pressure water. The video below shows a hydroformer that [Rainbow Aviation] uses (with considerably less screaming) to make stamped aluminum parts for home-brew aircraft. The kicker with this build is that there is no fluid — at least not until the 40,000-pound hydraulic press semi-liquifies the thick neoprene rubber pad placed over the sheet metal blank and die. The pressure squeezes the metal into and around the die, forming some pretty complex shapes in a single operation. We especially like the pro-tip of using Corian solid-surface countertop material offcuts to make the dies, since they’re available for a pittance from cabinet fabricators.

It’s always a treat to see hacks from the home-brew aviation world. They always seem to have plenty of tricks and tips to share, like this pressure-formed light cowling we saw a while back.

Continue reading “Low-Budget Hydroformer Puts The Squeeze On Sheet Metal Parts” →

Motion Activated Super-Squirter Stands Guard

October 18, 2017 by Steven Dufresne 14 Comments

Thieves beware. If you prowl around [Matthew Gaber]’s place, you get soaked by his motion activated super-squirter. Even if he’s not at home, he can aim and fire it remotely using an iPhone app. And for the record, a camera saves photos of your wetted-self to an SD card.

ESPino, ArduCAM UNO and voltage converter boards

The whole security system is handled by three subsystems for target acquisition, photo documentation, and communications. The first subsystem is centered around an ESPino which utilizes a PIR sensor to detect motion. It then turns on a windscreen washer pump and uses pan and tilt servos to squirt water in a pattern toward the victim.

The target acquisition hardware also sends a message to the second subsystem, an ArduCAM ESP8266 UNO board. It takes a burst of photos using an ArduCAM Mini Camera mounted beside the squirter outlet. The UNO can also serve up a webpage with a collection of the photos.

The final subsystem is an iPhone app which talks to both the ESPino and the UNO board. It can remotely control the squirter and provide a video feed of what the camera sees.

One detail of the build we really enjoyed is the vacuum relief valve he fabricated himself. It prevents siphoning through the pump when it’s not on. Don’t miss a demo of the squirter in action after the break.

Continue reading “Motion Activated Super-Squirter Stands Guard” →

Not Your Typical ATX Bench PSU

October 14, 2017 by Dan Maloney 7 Comments

We know what you’re thinking — yet another scrap PC power supply turned into a bench PSU. But look a little closer and you’ll see a nicely designed linear bench supply that just fits inside a gutted ATX case.

A lot of the items on [Medzik]’s BOM for this build are straight from the scrap bin. The aforementioned ATX supply case is one, as is the power transformer donated by a friend. Modules such as the 30V/2A regulator, the digital volt/ammeter, and a thermostat module to control the fan at higher power settings were all sourced via the usual suspects. The PSU boasts two outputs — an adjustable 0-22 volt supply, and a fixed 12-volt output. An unusual design feature is a secondary input which uses the 22-VAC supply from a Weller soldering station to give the PSU a little more oomph. This boosts the maximum output to 30 volts; one wonders why [Medzik] didn’t just source a bigger transformer, but you work with what you have sometimes. There are some nice touches, too, like custom-printed vinyl overlays for the case.

It’s a good-looking and compact unit with a decent suite of features, and you could do a lot worse when building your next bench supply. If it’s not your cup of tea though, just take your pick — tiny and yellow, built to last, or ensconced in Ultrasuede.

A Raspberry Pi Rain Man In The Making

October 13, 2017 by Dan Maloney 11 Comments

We see a lot of Raspberry Pis used to play games, but this is something entirely different from the latest RetroPie build. This Raspberry Pi is learning how to read playing cards, with the goal of becoming the ultimate card counting blackjack player.

If [Taxi-guy] hasn’t named his project Rain Man, we humbly suggest that he does so. Because a Pi that can count into a six-deck shoe would be quite a thing, even though it would never be allowed anywhere near a casino. Hurdle number one in counting cards is reading them, and [Taxi-guy] has done a solid job of leveraging the power of OpenCV on a Pi 3 for the task. His description in the video below is very detailed, but the approach is simple: find the cards in a PiCam image of the playing field using a combination of thresholding and contouring. Then, with the cards isolated, compare the rank and suit in the upper left corner of the rotated card image to prototype images to identify the card. The Pi provides enough horsepower to quickly identify an arbitrary number of non-overlapping cards; we assume [Taxi-guy] will have to address overlapping cards and decks that use different fonts at some point.

We’re keen to see this Pi playing blackjack someday. As he’s coding that up, he may want to look at algorithmic approaches to blackjack strategies, and the real odds of beating the house.

Continue reading “A Raspberry Pi Rain Man In The Making” →