How to make an ultrasonic non-contact Arduino Air Drum Set for hours of fun

I've always been fascinated with air instruments where you are able to create music without touching anything physical so to entertain my fascination I created a set of air drums that you can play just with your hands without making a physical impact on anything.

The set works with DFRobot URM09 ultrasonic distance sensors that detect when the hand has gotten close to the sensor and if that distance is closer than a set threshold, the appropriate MIDI note is played so a drum sound is played by FL Studio. The BLE MIDI connection is made through the DFRobot Firebeetle ESP32 board which has an onboard lithium battery charger and protection IC so the entire controller can be made as a portable device.

Since the Firebeetle is connected through BLE with the computer, the entire drum kit works as a BLE MIDI controller so it can also be used with mobile phones and software like FM Synthesizer on Android as well as any other MIDI-based software.

You can check out the DFRobot store here: https://www.dfrobot.com/?tracking=636...

Below is a list of all the DFRobot sensors and controllers used in the video:
URM09 Ultrasonic sensor - https://www.dfrobot.com/product-1832....
FireBeetle ESP32 IoT Microcontroller - https://www.dfrobot.com/product-1590....
Gravity I/O Expansion Shield - https://www.dfrobot.com/product-1592....
Gravity: I2C HUB - https://www.dfrobot.com/product-2179....
DFPlayer Pro - A mini MP3 Player - https://www.dfrobot.com/product-2232....
MAX98357 I2S Amplifier Module - https://www.dfrobot.com/product-2614....
Stereo Enclosed Speaker - https://www.dfrobot.com/product-1506....
Gravity: Voice Recorder Module - https://www.dfrobot.com/product-1507....

Written instructions are to be found on the project Instructable:
https://www.instructables.com/Ultraso...

The code used in the examples can be downloaded from the project GitHub repo:
https://github.com/bkolicoski/arduino...


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How to make an ultrasonic non-contact Arduino Air Drum Set for hours of fun
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