[Trandi] can check ‘build a self-balancing robot’ off of his to-do list. Over a couple of weekends, he built said robot, and, in his own words, managed not to over-design it. It even kept the attention of his 2-year-old son for several minutes, and that’s always a plus.
He was originally going to re-purpose one of his son’s RC cars, but didn’t want to risk breaking it. Instead, he designed a triangular 3-D printed chassis to hold a motor and some cogs to fit both the motor shaft and some re-used Meccano wheels. [Trandi]‘s design employs an MPU 6050 6-DOF IMU for the balancing act and is built on an Arduino Nano clone.
[Trandi] is controlling the motor with an L293D, which has built-in flyback diodes to minimize spikes. He found that the Nano clone was not powerful enough to handle everything, so he added an L7805CV voltage regulator. After the break, watch [Trandi]‘s cute bot tool around on various types of terrain, with and without a payload.
Don’t have an IMU lying around? You don’t really need one to build a self-balancing bot, as this IR-based lilliputian bot will demonstrate.
[via Dangerous Prototypes]
Filed under: Arduino Hacks, robots hacks
Though [Connor] labels it as a work in progress, we’re pretty impressed with how polished his transparent 7-segment display looks. It’s also deceptively simple.
The build uses a stack of seven different acrylic panes, one in front of the other, each with a different segment engraved onto its face. The assembly of panes sits on a small mount which is placed over seven rows of LEDs, with 5 LEDs per row. [Connor] left an air gap between each of the seven individual acrylic panes to clearly distinguish which was lit and to match the separation of the LED rows. To display a number, he simply illuminates the appropriate LED rows, which scatter light across the engraved part without spilling over into another pane.
You can find a brief overview and some schematics on [Connor's] website, and stick around for the video demonstration below. We’ve featured [Connor's] work before; if you missed his LCD data transfer hack you should check it out!
Filed under: Arduino Hacks, led hacks
‘Tantra’ is the new single from Timo Maas, taken from his latest artist album, ‘Lifer’. The video for the single, created by Daito Manabe, Motoi Ishibashi, Muryo Homma and Youichi Sakamoto (rhizomatiks) includes a machine that uses Arduino controlled ball dispensers, motorised rotating steel plates and LED lights to create a nexus between electronic music and a sound responsive mechanical object.
The Arduino Yún has been used by IAAC‘s Open Thesis Fabrication student Marisa Charusilawong to make an interactive toolkit for developing interactive facade elements using shape-memory alloy. During the 16-week intensive research program based in Barcelona:
We developed a modular system where several Arduino Uno’s can be networked over I2C and finally connect them to an Arduino Yun where a simple REST API is exposed allowing application to interface the system to manually actuate on the structure and to set the different behavior modes. Because Yun’s rich API capabilities we will be able to connect to other API’s to retrieve real time weather and environmental data on a near future.
The electronics were assisted by Physical Computing expert Guillem Camprodon based at IAAC – Fab Lab Barcelona who also wrote us:
It was amazing how easy and nice it is to connect things to the internet with Yún. We are planning a workshop on IoT at Fab Lab Barcelona by mid-winter and Yun will be the default platform. For the first time we will be able to teach IoT projects to non Arduino experts.
[Jack], a mechanical engineer, loom builder, and avid sailor wanted an autopilot system for his 1983 Robert Perry Nordic 40 sailboat with more modern capabilities than the one it came with. He knew a PC-based solution would work, but it was a bit out of reach. Once his son showed him an Arduino, though, he was on his way. He sallied forth and built this Arduino-based autopilot system for his sloop, the Wile E. Coyote.
He’s using two Arduino Megas. One is solely for the GPS, and the other controls everything else. [Jack]‘s autopilot has three modes. In the one he calls knob steering, a potentiometer drives the existing hydraulic pump, which he controls with a Polulu Qik serial DC motor controller. In compass steering mode, a Pololu IMU locks in the heading to steer (HTS). GPS mode uses a predetermined waypoint, and sets the course to steer (CTS) to the same bearing as the waypoint.
[Jack]‘s system also uses cross track error (XTE) correction to calculate a new HTS when necessary. He has fantastic documentation and several Fritzing and Arduino files available on Dropbox.
Autopilot sailboat rigs must be all the rage right now. We just saw a different one back in November.
Filed under: Arduino Hacks, gps hacks, misc hacks, transportation hacks
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I used a recycled stepper motor from an old printer as the motion source, attaching a CD clip to it so that we could make the CDs rotate at a stable velocity. The CDs were completed with a sticked paper with classical and brand-new phenakistoscope patterns.
By synchronising the strobe frequency of a white led stripe with the motor rotation, we accomplish the image-in-motion effect on the eye.
The sketch uploaded on the Arduino Nano is available at this link and below you can check the schematic and a video!
Enjoy the stroboscopic POV experience: