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Technology and musical instrument—Air drum with Arduino Uno

2018-10-29 16:26 来源:《留学》杂志 吴宸恺
2018-10-29 16:26:13来源:《留学》杂志作者:吴宸恺责任编辑:孙宗鹤

  How I started this project?

  As a drummer myself, I think it¡¯s quite necessary to practice some rudiments on the drum kit. Whenever I go to places other than my home, a whole set of drum kit seems not accessible. This inconvenient situation triggered my thought. I was thinking that if I could make something portable for my daily practicing and even rehearsal.

  The whole process of updating this air drum

  Before I have decided to use any software or hardware for my project, I spent much time building the basic structure of how this ¡®drum machine¡¯ work.

  *The final idea is like this:

  1.collect data.(distance, gravity, pressure light, etc.)

  2.computer read these data

  3.data changes, then program start to play sound from the computer

  After I decided to work with this basic idea, my first challenge is to find a proper way to collect data from the real world. Since I want to make a low-cost product for practicing, I looked at all the sensors that were accessible to me and had a long period experimenting with different kinds of sensors to test their sensitivity as a trigger. The first part of the drum machine is hand-triggered I took a look of all the sensors I have, and make a list of sensors which may be helpful for our project: Tracking sensor, shock sensor, avoidance sensor, ultrasonic sensor. Since I am not sure about the exact function of some sensors, so I did many experiments to test each sensor. Basically, I plugged in the sensor in my Arduino and write a brief code to get the data. The first one I have tried is tracking sensor, the problem is that it has a quite long delay. Shock sensor didn¡¯t appear in my final project because it required an intense shock to return some data. In comparison, the ultrasonic sensor is much more responsive than those.

  I have done lots of coding in Arduino and finally succeeded in collecting the correct distance between the ultrasonic sensor and the moving object(my hands, for example). Then I wrote a program to play the sound file on my computer: if the distance between the moving object and the sensor is smaller than 12, the sound will be played. This is my first version areodrum¡ª a simple machine to simulate the hi-hat and snare drum.

  My next step is to work on the part for my feet. In order to make a tool that is effective for practicing drum, I should at least put 2 triggers on the ground. One acts as the pedal of the bass drum, the other one is for the pedal of the hi-hat. At first, I used two buttons which were put in the middle of a breadboard, but when I actually tested them, I found it is almost impossible to tap that with the foot while not breaking the wires and the resisters. Then I move onto the ¡®soft spot¡¯ pressure sensor that I had never used before. However, I found it seems not to be so helpful. Using the distance to trigger the sound is not so difficult with a few ¡®if¡¯ statement, but the detailed method to deal with the data from pressure censor took me a while to figure out.

  For instance, what I got from the serial monitor is not the intensity of my force, rather, is just number represent the place of that sensor which seems not so helpful. After lots search about the mechanical of drum pedal, I realized that I have to catch the movement when my foot leaves the sensor and tap on the sensor. I changed my way to program that: one trigger is ¡®when the number changes from 0 to nonzero¡¯ the other is ¡®from nonzero to 0¡¯, with this new code, my final program is able to capture this move.

  What will this product be like in the future?

  I have spent more time than I expected on this project, and at the end of my making this air drum, I was actually thinking that whether I can update this simple drum machine to meet the manufacturer¡¯s standard. Within 5 years, I think all the alternatives and calculations I¡¯ve done on the computer would seem easy in a small chip. The materials of all the pressure sensors and the sensitivity of ultra-sonic censors will be improved a lot. That improvement may make this product meet the standard of a real concert.

  吴宸恺

  17岁 山东

  Experimental high school, 开学十二年级

  目标专业:人工智能,机器人设计

  利用暑假的时间,我参加了机器人制作和研究的课程。在课程中,我学习了关于机器人制作的许多专业性的知识。在硬件方面,掌握了用Arduino主板和电子元件来搭建机器人的电路,也了解并使用了许多新颖的传感器;在软件方面,熟悉了用c++为Arduino编写代码,同时也尝试了利用max msp编程来接受数据,再通过机器人和电脑的联系进行一系列操作。

  在和教授的研究课程中,我也尝试利用我掌握的这些知识来制作自己的project。基于我自己对音乐的爱好和研究,我成功制作了“空气鼓(air drum)”,利用传感器感应人的动作来达到鼓的效果,并且尝试用它来演奏。最后通过essay的形式来记录了我制作的过程。

[责任编辑:孙宗鹤]

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