LEDs Strips Tell You the Trains Aren’t Running

[James] is a frequent user of the London Underground, a subway system that is not immune to breakdowns and delays. He wanted a way to easily tell if any of the trains were being disrupted, and thanks to some LEDs, he now has that information available at a glance without having to check a webpage first.

Inspired by the Blinky Tape project at FT Engineering, [James] thought he could use the same strip of addressable LEDs to display information about the tube. A Raspberry Pi B+ gathers data from the London Underground’s TfL API and does a few calculations on the data. If there is a delay, the LEDs in the corresponding section of the strip will pulse, alerting the user to a problem with just a passing glance.

The project is one of many that displays data about the conditions you’ll find when you step outside the house, without having to look at a computer or smartphone. We recently featured an artistic lamp which displays weather forecasts for 12 hours into the future, and there was an umbrella stand which did the same thing. A lot is possible with LEDs and a good API!

Continue reading “LEDs Strips Tell You the Trains Aren’t Running”

Open Source, DIY Soldering Robot

After [Brian] starting selling his own Raspberry Pi expansion boards, he found himself with a need for a robot that could solder 40-pin headers for him. He first did what most people might do by looking up pre-built solutions. Unfortunately everything he found was either too slow, too big, or cost as much as a new car. That’s when he decided to just build his own soldering robot.

The robot looks similar to many 3D printer designs we’ve seen in the past, with several adjustments. The PCBs get mounted to a flat piece of aluminum dubbed the “PCB caddy”. The PCBs are mounted with custom-made pins that thread into the caddy. Once the PCBs are in place, they are clamped down with another small piece of aluminum. A computer slowly moves the caddy in one direction, moving the header’s pins along the path of the soldering irons one row at a time.

The machine has two soldering irons attached, allowing for two pins to be soldered simultaneously. The irons are retracted as the PCB caddy slides into place. They irons are then lowered onto the pins to apply heat. Two extruders then push the perfect amount of solder onto each pin. The solder melts upon contact with the hot pins, just as it would when soldered by hand.

The system was originally designed to be run on a Windows 8.1 tablet computer, but [Brian] found that the system’s internal battery would not charge while also acting like a USB host. Instead, they are running the Windows WPF application on full PC. All of the software and CAD files can be found on [Brian’s] github page. Also be sure to check out the demo video below. Continue reading “Open Source, DIY Soldering Robot”

Hackaday Links: May 3, 2015

Everybody loves How It’s Made, right? How about 3D printers? The third greatest thing to come out of Canada featured Lulzbot in their most recent episode. It’s eight minutes of fun, but shame the puns weren’t better. Robertson drives and the Avro Arrow, if you’re wondering.

Speaking of 3D printers, a lot of printers are made of aluminum extrusion. Has anyone tried something like this? It’s an idea that’s been around for a while but we can’t seem to find anyone actually using 3D printed extrusion.

CastARs are shipping out, and someone made a holodeck with retroreflective material. It’s an inflatable dome that’s attached to a regular ‘ol tent that works as a positive pressure airlock. If you’re looking to replicate this, try it with hexagons and pentagons. That should be easier than the orange-slice gores.

For some reason we can’t comprehend, USB ports are now power ports. There’s still a lot of stuff that uses 9 and 12V, and for that there’s the USB 912. It’ll work better with one of those USB battery packs.

Want to see what the Raspberry Pi 2 looks like with a Flir? NOQ2 has you covered.

Remember the Speccy? In the manual, there was an exercise left to the reader: reproduce [Mahler]’s first symphony with the BEEP command. It took a Raspberry Pi (only for synchronizing several Speccys), but it’s finally done.

TubeNetRadio Project Modernizes 1959 Tube Radio

Years ago, [Luk] came across an old tube radio. He’s since wanted to convert it to an internet radio but never really got around to it. Now that we are living in the age when a micro computer can be had for a mere $35, [Luk] decided it was time to finish his long lost project.

He chose a Raspberry Pi for the brains of his project because it is an inexpensive and well documented product perfect for what he wanted to do. [Luk] had a goal, to modify the radio as little as possible in order to get it to play both internet radio and locally stored MP3s. The radio from 1959 is certainly old, but it had a feature you may not expect. It had an AUX input with a separate volume knob out front. As is the radio itself, the input was mono. To connect the Raspberry Pi to the radio, [Luk] had to make an 1/8th inch stereo to banana plug adapter, a great solution that did not require any modification to the original radio.

WiFi is accessed though an off-the-shelf USB wireless module. After evaluating tapping into a 5vdc source somewhere in the radio, it was decided to use a wall wart to power the Raspberry Pi. A plug for the wall wart was spliced in after the radio’s main on/off switch. That way the radio and Raspberry Pi both turn on and off together. There is plenty of room for all of these added components inside the radio’s case.

The RaspPi can be fully controlled over the WiFi network but has a couple buttons wired up to the GPIO pins for limited manual control. The buttons for these controls fit perfectly in the round vent holes in the back panel of the radio’s case. Although the buttons are visible, no permanent modifications had to be made! [Luk] reports that everything works great, as do the original functions of the radio.

Robot K-9 Scares Off the Daleks

[Bithead942’s] love of the ever popular Dr Who series led her to develop a replica of the 4th Doctor’s robotic companion. It’s name is K-9, and was built from scratch in only 4 months. Its shell is made from HPDE – a light and bendable plastic. A custom plastic bender was constructed to get the angles just right, and custom laser cut parts were used in various places.

Its frame consists of aluminum channel, and is packed full of juicy electronics. An arduino with an XBee shield controls the remote voice, frickin’ laser and eye sensors. Another arduino is paired with a motor shield to control the linear actuator for the neck movement. And a Raspberry Pi keeps the LCD screen in order.

We’re not done, folks. Because this puppy is radio controlled, a custom controller is needed. Sparkfun’s Fio paired with another XBee is used along with a 16×2 LCD and various other electronics to keep the robot on an invisible leash.

Be sure to check out the blog site, as it goes into great detail on all the various parts used to construct this complicated but awesome project.

A Custom, Workshop Squeezebox

Launched over 10 years ago, the Squeezebox was one of the most popular network streaming devices sold. The idea was simple: put some MP3s on a computer, connect the Squeezebox to a LAN, and stream those tunes. Someone at Logitech had the brilliant idea that MP3s and other audio files should be stored in an online service a while back, something that didn’t sit well with [Richard]. He went out and built his own Squeezebox with a Raspberry Pi, out of an ammo box, no less.

Most of the project is based on another Squeezebox Raspi mashup over at Instructables. This was a wall-mounted project, and not encased that keeps 7.62 ammunition secure during transport. It did, however, provide enough information for [Richard] to use in his project.

To make his Squeezebox look a little more industrial and sturdy, he cut a few holes in a NATO ammo can for speakers, a TFT touchscreen display, and a USB charger port. Inside, a pair of powered speakers, a USB hub, and a powerbank were added, making this a portable streaming solution that can take a beating.

Raspberry Pi and Kindle Together Again

We’ve seen a lot of projects recently that take advantage of the Raspberry Pi 2’s augmented abilities. With the increased processor power and double the memory, it puts a lot more utility in the user’s hands. The latest project that takes advantage of this is the Pi-nk, which combines a Pi with a Kindle for some text-based awesomeness.

[Guillaume] has put together this detailed how-to which, unlike other builds we’ve seen in the past, uses wireless instead of USB for almost all of the connections, including the keyboard. Granted, this isn’t a new idea, but he’s presenting the way that he did it. To that end, all of the commands you’ll need to use are extremely well documented on the project page if you want to build your own. When everything is said and done, you’ll be SSHing into the Pi from the Kindle and using the popular “screen” program to get the Pi to use the Kindle as its display.

Additionally, [Guillaume] has posted some schematics for custom enclosures for the Pi-Kindle pair if you’re more ambitious. He points out that the e-ink display is great if the Pi is being run in text or command-line mode, and we’d have to agree. This is a very clean pairing of these devices and puts the strengths of both to great use!