Episode 008: The Podcast of Questionable Legality

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While Matt was curious how to move a box in multiple directions with only one wheel, Jake decided to contemplate the wide world of counterfeiting money, and the practices one should follow if they want to be accomplished in this field. We also discuss questions about how we might go about using a speed sensor and the requirements for a motorized longboard.

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Q0 – (0:54) – An omnidirectional box that retains orientation
-Two different types of Multi-directional wheels
-I wasn’t able to find a good example of motors being spun around a ball wheel, this might mean it’s not the best idea. Here’s a link to how a ball mouse works though, if you can imagine that the rollers are powered motors rather than sensors you’ll get an idea of how this might work.
-Jake quickly sketched out in paint his idea for a rotating wheel mount that can turn the wheel in the desired direction. He apologizes for the quick and dirty nature of the sketch.

Q1 – (4:30) – Electronic Speed Trap
-Details on his Pic chip
-An introduction to programming with MicroC (note: Project 6 details pretty close to exactly what you want to do)
-These two forum topics have some information on your question
-Some code in MicroC for Ultrasonic Sensor
-This seems like the code you’re looking for

Q2 – (11:55) – Motorized Longboard
-The Motor and Battery referenced in the question.
-Hackaday has some cool links that lead to a bit of a rabbit hole of projects
-In addition to that last link from Hackaday, I found a few more on Instructables
-An amazing patent I found in the course of my research
-Apparently this was someones school project as well, and they detailed exactly what you’ll need (I would recommend reading their suggestions and building it how you want, they’re build was over a thousand dollars)
-Boostedboards kickstarted a project like this. I would recommend checking out their blog, their TED talk and the information they placed on their Kickstarter. You can get a feel for what parts they used, and how they implemented everything
-Metro board made something similar (skateboard, not longboard), and have a cool video on their speed control mechanism (which you could also probably make with a dimmer switch)
-Make sure you have enough torque to propel the Skateboard
-Here’s a motor that has four and a half times the torque but is 33 times slower then the motors you chose (It might also be worth noting they run on half the voltage)
-Here are some 5 and 8 Watt Potentiometers on Mouser, and some more on Digi-Key
-There’s a book on Google Books with an excellent explanation of the ice cream scoop mechanism

Q3 – (27:23) – Projects of Questionable Legality – This Week: Counterfeiting Money!
-Canada’s melting money
-A cool site detailing the new security features and look of the upcoming US $100 bill
-You can also find info in the currency section of the US Treasury website (they mainly link back to the previous link, but things are easier to find here)
-US Bill security features (both pre and post 1996)
-Jake hadn’t looked up the consequences of counterfeiting, but I figured it’d be nice to know
-Some images of presses that print money (or perhaps you’d just like to buy one?)
-Sadly, my dream of a commemorative 20 dollar bill died before it ever got a chance to fly
-Turns out the cotton / linen mixture is 75% / 25%
-The Superdollar
-The most credible link I could find for dimensions of US note sizes was Wiki Answers and they didn’t provide any references, so I have no idea how accurate that is – but if true, then all US note sizes are exactly the same and I was absolutely incorrect
-Magnetic Ink on the US Bill
-Perhaps you’d like your own magnetic ink



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