Controlling Music with the Wave of a Hand

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[Thomas] created a magical music player that gives the listener the ability to change songs and alter the volume levels without having to touch anything but air. Called the LighTouch, this device puts the control in the hands of the user by interpreting input from an ultrasonic sensor and plays back tracks based on waving gestures.

It is the 2nd iteration of a prototype that he completed about a year ago and functions as a streaming radio/alarm clock. The sensor is hooked up to a Raspberry Pi with a fading LED. Everything is highly customizable including the distances used for playback features. The criteria [Thomas] put in place has the pause method trigger when an object is detected between 0-10cm from the sensor. The volume control on the next level up brightens and dims the LED light just for some added flair.

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The Pi CNC Controller

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Back in the olden days, the latest and greatest CNC machines had minicomputers bolted onto their frames, replete with paper tape readers and seven segment displays. For the home CNC machinist of today, these hulking electronic brains are replaced with something a little more modern – desktop computers with parallel ports. Having a box filled with computers and motor drivers is just too cool though, and this tiny Raspberry Pi CNC controller fits the bill quite nicely.

The controller uses a Raspberry Pi as the brains of the device, but there aren’t too many options out there for stepper motor control in Pi land. There are, however, dozens of CNC shields or the Arduino. The Pi AlaMode board is able to provide voltage level conversion between the CNC shield and the pi, and also has the nice bonus of a battery-backed real time clock.

With some proper connectors, lighted buttons, and a beautiful cable sleeving job, this Pi CNC controller would be well suited for any of the desktop CNC  or engraving builds we see from time to time.