Maker Christian Toparceanu, of the Compact DIY YouTube channel, has put collectively a music field with a distinction: moderately than a spiked rotating drum triggering steel keys, it is a completely digital system pushed by an Arduino — however studying music from punch playing cards, like a classic participant piano.
“The working precept is easy,” Toparceanu writes of the musical challenge. “A chunk of opaque paper passes over eight sensors equivalent to the eight primary musical notes. When a paper cut-out passes in entrance of one of many sensors, it modifications its analog output worth and the Arduino notices this by producing a tone. The clipping could be longer or shorter, implicitly the size of the tone generated.”
The low-cost music field is constructed round an Arduino-compatible microcontroller linked to eight infrared sensors — one for every of the eight bits within the punch playing cards on which music is encoded. Because the punch card, constructed by hand to a much bigger scale than the normal playing cards used within the early days of computing, passes over the sensor it displays the emitted infrared mild again — except there is a cut-out hole within the paper, by which case a specific observe is triggered.
“The mechanical half is straightforward to do,” Toparceanu says. “The development of the sensor requires particular consideration, I opted for eradicating the elements from the plastic help and mounting them on a [prototyping] board. The paper guides are constructed with what I discovered round the home, plastic tubes and items of hose. For slicing the notes on paper, I used to be impressed by piano tutorials for freshmen on the Web. You may select any tune you need.”
The infrared sensors are faraway from their plastic housings and positioned on prototyping board, to scale back the scale of the punch card. (📷: Christian Toparceanu)
“After slicing the paper with the specified melody, it’s inserted between the 2 plastic guides. We activate the gadget and switch the crank. If the cutouts are accomplished appropriately, the machine ought to play the chosen melody at a pace dictated by the pace of rotation of the crank.”