It's really nice to receive pics of projects people have built out of our book "Junkbots". Here's one of the latest: the Pendulum by Christopher Pepe. Nice magnetic suspension mechanism! Read More...
Every year a group of my friends have an engineering Secret Santa. The rules are simple: make something cool for under $20 that requires engineering to complete. In years past we’ve seen Google cardboard VR headsets that are 6DOF, match stick rockets, 3D printed fans that explode when used, 3D printed rockets with cardboard launch controls, and a host of other semi dangerous, partially completed projects that are more than a little interesting.
This year I decided to create a portal device from the Popular Adult Swim show Rick and Morty. The device opens portals from one dimension to another by spinning a knob to select the target dimension number on a 7-segment display. With a background in electrical engineering, I thought that this was an excellent project to start tinkering on! Plus, the 3D printer needed a workout.
Parts List
• 1x Rotary Encoder
• 1x 7-Segment Serial Display
• 4x 10mm Green Diffused LED
• 1x 4.5m Green LED String
• 1x 2xAAA Battery Holder
• 5.0V Micro Boost Regulator
The Build
I based this build on Sparkfun's 7-Segment Serial Display, which has the desirable feature of being designed around the ATmega328P, a.k.a. the Arduino chip. I replaced the stock library that controlled the 7-segment display with my own, allowing me to use the excess power to control my project's logic flow.
To mimic the functionality of the portal device in the show, I combined the 7-segment display with a rotary encoder. I used a library online to read the grey code of the encoder and turn it into a basic clockwise/counter clockwise selection knob. The encoder's wheel also acts as a button for simple spin/set operation (seen above, showing the default dimension, C137).
Power comes from a simple AAA battery pack with built-in on/off switch & pre-tinned leads soldered to a small 5V boost converter used to power the 7-segment, processor, and LEDs.
Although there are 3D STEP files online, I designed up my own implementation of the portal device in Solidworks before printing them on our Kossel Delta 3D printer. The CAD files need polish before we release them to a 3D repository, and we'll update the blog entry when they're available.
The large 10mm green LEDs round out the effects nicely. LED voltage drop calculations showed wiring them up 2 in series, 2 in parallel for a nice green glow without requiring current limiting resistors.
To enhance the glow to the top tube, SuperFlex LED strings were wired directly to the 3V battery source and stuffed unceremoniously into the tube. And as with all quick DIY projects, everything was assembled into the portal device with superglue.
The last step of the build was to add a little door at the bottom of the portal device so that the battery pack can be accessed.
Although not quite perfect, it turned out rather well considering I only had two sleepless nights to get it ready. Revision 2 requires adjusted CAD files, a wiring schematic, and better matched tube/front LED colors.
C'mon Morty - there's something I need you to do....
It's really nice to receive pics of projects people have built out of our book "Junkbots". Here's one of the latest: the Pendulum by Christopher Pepe. Nice magnetic suspension mechanism! Read More...
We have pictures from the Los Alamos National Labs Workshops! Check them out under the Gallery heading, or at the bottom of this post. We are having temporary difficulties with our Solarbotics.net server, eliminating the ability to read PDF files or downloads. This should be rectified soon. Also, in the transfer process, everyone who asked […]
Today we have a rainbow of colorful stuff, which apparently doesn't look anything like it at the moment, but believe me, it is. eSun 1.75mm PLA filament - 1kg Spool $30.00 1.75mm PLA filament for 3D printing. PLA is an excellent general purpose filament with a great finish, very rigid and biodegradable. eSun 1.75mm ABS […]
Never mind that 10 block line-up at your local home electronics store. Solarbotics is where it's at this holiday season for great quality, inexpensive robots and parts. Feast your eyes on the packages of motors, wheels, kits and supplies which are all over 20% off the regular two-for pricing!! Do you want motors and LOTS […]
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Warning: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
Please visit www.P65Warnings.ca.gov for more information. This item was manufactured prior to August 31, 2018.