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tonyPick [soylentnews.org] writes:

Spotted on Hackaday is this fun little hack which builds an automatic pneumatic harmonica [hackaday.com], using an air compressor, solenoid valves and a micro-controller.

It’s actually an offshoot of his other project, a high-speed candy sorting machine. There, he’s trying to outdo the more common color-sensor-and-servo style contraptions by using computer vision for the color detection and a number of compressed-air jets to blow the candy off of a conveyor belt into the proper bins.

But before that gets rolling, a test of the computer-controlled pneumatic setup is in order. And that’s where the harmonica entered the picture. The “build” is really just him putting the tubes from the candy sorter into a harmonica.

Although it's only a four note test it's a neat little build and fun to see in action via YouTube [youtube.com].

There is also a project page for the harmonica [hackaday.io], and the main project page for the candy sorter [hackaday.io] includes more details on the setup.

Original Submission