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Convert an previous phone right into a MIDI instrument

Convert an previous phone right into a MIDI instrument

Arduino WorkforceSeptember 1st, 2022

MIDI (Musical Instrument Digital Interface) is a implausible customary as a result of it’s versatile sufficient to embody nearly all devices, however easy sufficient to work with utilizing low-power digital {hardware}. A typical MIDI message incorporates three bytes. The primary is a standing byte that describes the motion (like “notice on”) and the channel to make use of, the second byte incorporates the notice to play, and the third byte defines the speed. As a result of a single change can act as a set off to ship a MIDI message, one can flip an previous contact tone phone right into a MIDI instrument.

The cellphone used on this venture and most others prefer it have numeric keypads arrange in the identical approach as keyboards, with a matrix decreasing the variety of I/O pins wanted on a linked microcontroller. Multiply the quantity or rows within the matrix by the variety of columns to get the utmost variety of keys. This specific keypad had a mixed row/column whole of 11, which suggests it may help as much as 30 distinctive keys. However solely 12 of these are linked, so the tutorial contains directions on tips on how to establish the important thing that every row/column combo triggers. As soon as you realize that info, you possibly can join the row and column wires to the I/O pins of an Arduino.

The supplied Arduino sketch will deal with just about the whole lot else after you assign the pin numbers, however it’s nonetheless price understanding the way it works. First, it loops by the entire obligatory rows and columns to find out the states of each button. From there, it sends the assigned MIDI message by a MIDI jack linked to the Arduino by three wires. You’ll be able to assign pre-made messages to particular keys, or you will get artistic and create particular algorithms that alter the messages based mostly on key combos or sequences. Join any MIDI output gadget to the MIDI jack to synthesize or pattern the notes, or join it to a pc to document MIDI sequences.

As a bonus, this tutorial even explains tips on how to convert the handset right into a useful microphone which you can amplify, so you possibly can have vocals to accompany your MIDI music.

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