Perpetual pong


[Jeff Joray] wrote in to show off this perpetual Pong device he built. The six by ten LED matrix acts as a game board for Pong but there are no controls. The board simply plays against itself. It’s pretty much a pong clock without the clock.

The brain of the device is a PIC 16F684 which drives the six rows of the display directly. He went with a decade counter (CD74HC401) to scan the rows one at a time. Now what would you expect to find on the underside of this hunk of protoboard? A rat’s nest of point to point wiring? If so you’re going to be disappointed. [Jeff] spent the time to generate a schematic and board layout in Eagle. While at it, he knew he was going to be using protoboard so the artwork is designed to use solder bridging as much as possible. What he ends up with is one of the cleanest mutiplexed one-off projects you’re going to find. See it in action after the jump.

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MIDI pedal project looks as good as it sounds


[Lee O’Donnell] is showing off his version of a MIDI organ pedal hack. We’ve been seeing a few of these lately. The organ pedals are a great stating point as they’re easy to patch into electronically, and are designed to take a beating from your feet and come out the other side no worse for wear. The build goes beyond one of our favorite MIDI pedal conversions in both features and finish.

An Arduino Nano pulls this project together. It scans the pedals constantly and converts the key presses into MIDI signals. But the design includes this fabulous looking front-end which [Lee] first prototyped in cardboard before cutting and bending his own Aluminum tread plate. A two-row character display provides a menu system, but the buttons themselves act as feedback based on the behavior of the light inside each of them. One example of this is shown early in the demo video after the break. The blue button toggles between polyphonic and monophonic mode with the light fading in and out for the latter.

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Hacker sends this through the mail to record a video of the process

[Ruben van der Vleuten] wanted to get a look at the adventure a package experiences when shipped from one place to another. So he threw together this mishmash of components to record the experience. We certainly enjoyed watching the fast motion video found after the break. We wonder what the shipping agency thinks about this sort of thing?

Camera, digital storage, and battery technology have gotten to the point that it’s both cheap and easy to do this sort of surveillance. But there are a few logistical things that [Ruben] took into account to make this work quite well. First off, he need to hide the camera in a way that would ensure the package didn’t look suspicious. He ended up writing his name on the side of the box and boring a hole through one of the black letters which is smaller than a pea and very hard to spot. To make sure he wasn’t recording a ton of empty (dark) frames he also included electronics to sense motion. When the package is moving the video is always rolling. when not moving the hardware wakes for just 3 seconds every minute to shoot video.

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