If you are blind or your vision is impaired, moving around in a new space can be a harrowing experience. A cane helps, but only samples one point at a time, and can’t help that much above a certain height. The Digital White Cane is a haptic feedback device that uses Time of Flight components to detect surrounding objects.
The Digital White Cane uses a type of LIDAR known as Time of Flight (ToF) sensing. Rather than a point by point scan by a laser, ToF sensors capture an entire scene with each pulse. These sensors are actually somewhat new and designed for the latest generation of robotics and hand detection for soap dispensers. The good news is that they’re small and cheap, just what you want for a wearable.
The sensors allow detection of objects within 2m (about 6 feet) from all directions. Haptic feedback allows the wearer to determine where the object is around the wearer. Because it’s head-mounted, it detects objects at head height as well as floor height. A Teensy LC is used as the main processor and is connected to the ToF sensors as well as small motor board for the haptic feedback.
This project has a lot of potential to help people with vision impairment and is a great entry into the 2017 Hackaday Prize. Check out the video after the break to see it in action. If you’re looking for some more applications of this small, cheap ToF sensor, check out this cat food dispenser, and here’s a ball-balancing robot – both pretty cool projects in their own right.
Continue reading “Hackaday Prize Entry: Digital White Cane”
Gerrit and I were scoping out the Intel booth at Bay Area Maker Faire and we ran into Nolan Moore who was showing of his work to mash together a Nintendo Power Glove with an AR Drone quadcopter. Not only did it work, but the booth had a netted cage which Nolan had all to himself to show off his work. Check the video clip below for that.
The control scheme is pretty sweet, hold your hand flat (palm toward the ground) to hover, make a fist and tilt it in any direction to affect pitch and roll, point a finger up or down to affect altitude, and point straight and twist your hand for yaw control. We were talking with Nolan about these controls it sounded sketchy, but the demo proves it’s quite responsive.
The guts of the Power Glove have been completely removed (that’s a fun project log to browse through too!) and two new boards designed and fabbed to replace them. He started off in Eagle but ended up switching to KiCAD before sending the designs out for fabrication. I really enjoy the footprints he made to use the stock buttons from the wrist portion of the glove.
A Teensy LC pulls everything together, reading from an IMU on the board installed over the back of the hand, as well as from the flex sensors to measure what your fingers are up to. It parses these gestures and passes appropriate commands to an ESP8266 module. The AR Drone 2.0 is WiFi controlled, letting the ESP8266 act as the controller.
Last month, GitHub users were able to buy a special edition Universal 2nd Factor (U2F) security key for just five bucks. [Yohanes] bought two, but wondered if he could bring U2F to other microcontrolled devices. he ended up building a U2F key with a Teensy LC, and in the process brought U2F to the unwashed masses.
Universal 2nd Factor is exactly what it says on the tin: it doesn’t replace your password, but it does provide a little bit of extra verification to prove that the person logging into an account is indeed the person that should. Currently, Google (through Gmail and Google Drive), Github, Dropbox, and even WordPress (through a plugin) support U2F devices, so a tiny USB key that’s able to provide U2F is a very useful device.
After digging into the U2F specification [Yohanes] found the Teensy LC would be a perfect platform for experimentation. A U2F device is just a USB HID device, which the Teensy handles in spades. A handy library takes on ECC for both AVR and ARM platforms and [Yohanes’] finished U2F implementation is able to turn the Teensy LC into something GitHub was selling for $5.
It should be noted that doing anything related to security by yourself, with your own code is dumb and should not be considered secure. Additionally, [Yohanes] didn’t want to solder a button to his Teensy LC, so he implemented everything without a button press, which is also insecure. The ‘key handle’ is just XOR encryption with a fixed key, which is also insecure. Despite this, it’s still an interesting project and we’re happy [Yohanes] shared it with us.
You know how it goes – sometimes you look at your social calendar and realize that you need to throw together a quick claw machine. Such was the dilemma that [Bob Johnson] found himself in during the run-up to the Nashville Mini Maker Faire, and he came up with a nice design that looks like fun for the faire-goers.
Seeking to both entertain and enlighten the crowd while providing them with sweet, sweet candy, [Bob] was able to quickly knock together a claw machine using mainly parts he had on hand in the shop. The cabinet is nicely designed for game play and to show off the gantry mechanism, which uses aluminum angle profiles and skate bearings as custom linear slides. Plenty of 3D printed parts found their way into the build, from pillow blocks and brackets for the stepper motors to the servo-driven claw mechanism. A nice control panel and some color-coded LED lighting adds some zip to the look, and a Teensy LC runs the whole thing.
Like [Bob]’s game, claw machines that make it to Hackaday seem to be special occasion builds, like this claw machine built for a kid’s birthday party. Occasion or not, though, we think that fun builds like these bring the party with them.
Continue reading “Full Size Custom Claw Machine Built with Parts on Hand”
When you’ve got a scanning electron microscope sitting around, you’re going to find ways to push the awesome envelope. [Ben Krasnow] is upping his SEM game with a new rig to improve image capture (video link) and more easily create animated GIFs and videos.
The color scheme of the SEM housing gives away its 80s vintage, and the height of image capture technology back then was a Polaroid camera mounted over the instrument’s CRT. No other video output was provided, so [Ben] dug into the blueprints and probed around till he found the high-resolution slow scan signal.
To make his Teensy-LC happy, he used a few op-amps to condition the analog signal for the greatest resolution and split out the digital sync signals, which he fed into the analog and digital ports respectively. [Ben] then goes into a great deal of useful detail on how he got the video data encoded and sent over USB for frame capture and GIF generation. Reading the ADC quickly without jitter and balancing data collection with transmission were tricky, but he has established a rock-solid system for it.
Continue reading “Scanning Electron Microscope Images and Animations Pulled By Impressive Teensy LC Setup”
This week we’re giving away 125 Teensy-LC Boards. You’ve sat on the sidelines long enough. Time to write down your Hackaday Prize idea and get it entered!
It isn’t just the big prize (a trip into space) on the line. Each week we’re giving away things to help your build. Below you can see the 50 projects which won a LightBlue Bean from last week’s giveaway. This week it’s a huge number of Teensy-LC boards going out to those who need them. These little wonders pack a real punch, with a 48 MHz ARM Cortex-M0+ that has 62K of flash, 8k of RAM, plenty of IO and a 12-bit analog module for both input and output! You’ll also be eligible for each of the future weekly giveaways… we’re distributing $50,000 in prizes to hundreds of projects over 17-weeks!
Entering is easy. Write down your idea to help solve a problem faced by a wide range of people. Start fleshing out your build plan. Pictures are a huge help, even if they’re just a hand-drawn sketch on some paper! Your best bet at getting recognized for a giveaway is to post a new project log which mentions how you would add this Teensy board to your creation.
Last Week’s 50 Winners of a LightBlue Bean
Congratulations to these 50 projects who were selected as winners from last week. You will receive a LightBlue Bean which combines Bluetooth LE with an ATmega328 in a nice little package ready for prototyping. Don’t forget to post pictures and information about what you build with these little wonders!
Each project creator will find info on redeeming their prize as a message on Hackaday.io.
For one reason or another, we’ve been seeing a lot of builds featuring the Teensy 3.1 filtering in on the tip line recently. In retrospect, it’s somewhat obvious; it’s a good board that’s cheap and fast. Yes, somehow [Paul] hit all three in the good/cheap/fast mutually exclusive triumvirate.
Now, there’s a new Teensy. It’s the Teensy LC – Low Cost. It’s not as powerful as the Teensy 3.1, but it does give you the power of an ARM for something that’s just about as cheap as a board with an ATMega.
The chip [Paul] chose for the Teensy LC is the Freescale MKL26Z64 (datasheet here and 876-page reference manual here. PDFs of course). This is a 32-bit Cortex-M0+ running at 48 MHz with 64k of Flash and 8k of RAM. There are 27 digital I/O pins on this one, and the Teensy LC has been designed to be pin-compatible with the Teensy 3.0 and 3.1.
On board are 13 analog inputs, 8 PWM outputs, on 12-bit DAC output, three serial ports, two SPI ports, and two I2C ports. Most of the pins can drive 5mA with a few capable of driving 20mA, and there is a single 5v output pin for driving WS2812 Neopixel LEDs.
Since this is a cut-down version of the Teensy, everything available on the Teensy 3.1 just can’t fit into the BOM of the Teensy LC. The pins aren’t 5V tolerant, there’s no CAN bus, and there are only 4 DMA channels instead of 16 on the Teensy 3.1. Still, it’s a great ARM answer to the ATMega Trinket or other small dev boards.