Several years ago I got my hands on a compact drum machine from the notorious teenage engineering. Then I was very struck by the idea - to use a printed circuit board as part of the case and design element of the device. Since then, I also wanted to assemble a device similar in style. As a result, I put together a simple midi bluetooth keyboard that easily connects to a laptop or iPhone.
Idea
USB (, ATmega32u4) , , . , USB-? - ESP32, bluetooth, MIDI-BLE.
Midi over Bluetooth
BLE-MIDI 2017 MIDI- Bluetooth 10-20 ms ( USB — 4 ). , iOS 8- , Android c 6-, Windows 10 Mac OS High Sierra. , , , - Garage Band.
. - BLE- MIDI Service UUID MIDI Characteristic UUID, BLE-, MIDI- ( )
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ESP32 CD74HC4067. : CD74HC4067 , Common Output . , pitch-wheel .
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- — . , . , Teenage Engineering PO-12, , . , , , .
- , , . , PLS- , LiPo TP4056. , LDO ESP32 . midi-. EASYEDA DirtyPCB.
3 .
PCB- , , . -, , ADC- EPS32 WiFi bluetooth, ADC2 Bluetooth. ? !
, , : . , AMS1117-3.3, ESP32 , 0.7 . , LD3985M30R. , -
, : Arduino IDE, , PlatformIO.
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, 3D-, DIY , lasercut`.
Fusion360 6 .
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, midi-, oled- PCB, .