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Here’s a video of my very hackable 12-channel logic level shifter/translator with a voltage regulator. This video demonstrates how it works. There’s more detail here at the DIY 12-Channel Bidirectional Logic Level Shifter post.

In this example, it’s translating from 7.5V to 3.3V. In another example at the link above, I’ve demonstrated the hackability by wiring it up to drive a 3.3V Nokia 5110 LCD, using five of the 12 channels as logic level translators. Channel two is wired directly to 3.3V for power, channel three is wired directly to ground, and the transistor on channel nine is turned so that the 5V signal controls the gate, which allows PWM control of the LED with full power from the regulator.

Music: “Art Now” by AlexBeroza (CC BY 3.0)

40-pin female headers are inexpensive and easy to trim down to size, and with a dot of CA glue (super glue), you can even easily make other configurations, like 2×4. Sometimes they’re even described as “break-away” headers, although admittedly they don’t break away as easily as the male pin headers. Just keep in mind that if you don’t score it, it could shatter.

Someone was looking at one of my PCBs and commented that it’s “impossible to break them apart without destroying at least 2-3 pins each time.” Using this technique, I’ve never “destroyed” any more than one, and with a little care, the edges turn out quite nicely.

Music: “The New Music” by AlexBeroza (CC BY 3.0)

He we’re test-driving the our latest robot creation for the first time. It’s the boy’s design and made mostly of wood. The tires are o-rings, and there’s a 12V AA batter pack sandwiched between the two pieces of plywood. The system right now consists of a drive controller using a Modern Device‘s RBBB (small Arduino-compatible) and the Pololu TB6612FNG Dual Motor Driver Carrier, a robot controller, which is a standard Arduino Uno (which doesn’t do a whole lot right now expect forward messages from the remote), and a remote controller, which is another RBBB, joystick and display.

Right now there are two driving modes. The first is a tank drive, where, for example, if the joystick is moved far left, the right wheel moves forward at full speed and the left week backward at full speed. The second mode is what I call “target drive,” in which you set the target speed and direction of each wheel. Soft starting and stopping is built in to the controller, and the jerkiness you see sometimes is a bug in the keep-alive timer — if the robot stops getting messages in target drive mode, then it will stop.

Music is “Don’t you” by stefsax (CC BY 2.5).

Math Monday came early this week, and we had some fun exploring Reuleaux triangles. Next to a circle, they’re the simplest curve of constant width you can make — that basically means you can roll a plank on top of them as smoothly as on wheels. The kids didn’t expect that one! (They also would make great manhole covers!)

Although they roll very smoothly, they do tend to wobble around a bit, so I built a little gutter on the plank to make it easier for the kids to experiment with. It was a quick project, and lots of fun for the kids. You don’t have to use a band saw or even the sander; all you really need is a jigsaw or coping saw, some scrap wood, and some nails.

Music credits: “260809 Funky Nurykabe” by spinningmerkaba (CC-BY 3.0)
http://ccmixter.org/files/jlbrock44/29186

In celebration of Independence Day here in the United States of America, here’s a great 10-minute narrated animation that reviews how the nation got to where it is today. Read the instructions, click the X, then click Play.

http://www.animatedatlas.com/movie.html

Videos are available for sale at http://www.animatedatlas.com/

If the hot shoe (flash mounting point) on your Canon Digital Rebel camera is loose, then your flash might not be stable on the camera or operate properly. It may not be immediately obvious how to fix it. This video shows you how to do it with a couple of flat screwdriver tips and a tiny PH000 Phillips head screwdriver. (They often sell these in sets of five or seven.) The trick is to lift up on the clip so that the front lip clears its catch and it can slide back. You may need to lift it over the screws as well if they’re really lose.

(Yes, that’s a Spider Man bandage. I have an excuse; I’m a daddy.)

This is a video with some puppets in it. There’s not much else I can say about it, other than that it is quite possibly the greatest work of visual art ever to exist.

I ran across this ad for Lufthansa today at Die Welt. It got my attention — the whole web page fell off the screen. I almost wish I’d caught it while the content on the site still matched the image.

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