Hardware Design

Portable music instrument with location-aware sampling, synthesis, and AI composition

OH MY ONDAS SONIC CAPTURE SYSTEM
GPS
♪
MIC · 360° CAPTURE
▶
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120 BPM
41.38, 2.17
Form: Camera
Mic: 360° Omni
Display: 2.5" LCD
Controls: Shutter + Dial
Weight: ~280g
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120 BPM
TAP
40.4168, -3.7038
14:32
SEQ
MIX
SYN
SCN
AI
FX
RAD
SEQ SMP SYN RAD MIC
A
B
C
D
PICTURE
SOUNDSCAPE
INTERACT
PADS CTRL
1
2
3
4
5
6
7
8
VOL80
PANC
FX30
BPM120
▶
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+
GPS 40.4168, -3.7038 Madrid, ES
Audio Out
Headphones
Audio In
◌
PiezoVibration sensor
♪
MicCondenser
≡
WiFi802.11
Ⓑ
RadioFM Antenna
Display: 5" LCD
Pads: 8x MPR121
Encoders: 4x Rotary
Modes: 3 Buttons
Buttons: 6 (Transport + Mode)
▶
■
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120 BPM
TAP
40.4168, -3.7038
14:32
SEQ
MIX
SYN
SCN
AI
FX
RAD
EQ
SEQ SMP SYN RAD MIC RND CLR EUC DUB
A
B
C
D
E
F
G
H
PICTURE
SOUNDSCAPE
INTERACT
JOURNEY
PADS CTRL
1
2
3
4
5
6
7
8
VOL80
PANC
FX30
BPM120
CUTOFF72
RES40
ATK10
REL50
MIC
75
SMP
90
SYN
60
RAD
45
SHIFT
DUB
FILL
CLR
SCENE
FX
X-FADE
AB
▶
■
●
+
GPS 40.4168, -3.7038 Madrid, ES
Audio Out
Headphones
Audio In
◌
PiezoVibration sensor
♪
MicCondenser
≡
WiFi802.11
Ⓑ
RadioFM Antenna
Display: 5" LCD
Pads: 8x MPR121
Encoders: 8x Rotary
Faders: 4x Mixer
Buttons: 13 (Transport + Mode + Func)
X-Fade: 1x Slider

Interactive Prototype

The full interactive hardware mockup with working controls, embedded web app display, and physical-style button interaction. Petrol green enclosure with all controls wired to the embedded app.

13 encoders, 4 faders, 8 pads, 16 buttons, 5-way joystick, crossfader — all interactive

Open Interactive Mockup

Technical Specifications

Audio Engine

  • Sample Rate: 44.1kHz
  • Bit Depth: 24-bit
  • Latency: <10ms
  • 8 Sample Slots (30s each)
  • 8-Track Step Sequencer
  • 3 Effect Types (Delay, Glitch, Grain)

Inputs

  • Stereo Line In (3.5mm TRS)
  • Microphone In (3.5mm TRS)
  • MIDI In (TRS-A)
  • USB-C (Data + Power)
  • GPS Antenna (internal)

Outputs

  • Stereo Main Out (3.5mm TRS)
  • Headphone Out (3.5mm TRS)
  • MIDI Out (TRS-A)
  • USB Audio (Class Compliant)

Controls

  • 8x Touch Pads (MPR121)
  • 5x Main Encoders (VOL/PAN/FILT/FX/DECAY)
  • 4x Synth Encoders (CUTOFF/RES/ATK/REL)
  • 4x FX Encoders (DELAY/GLITCH/GRAIN/CRUSH)
  • 4x Mixer Faders (MIC/SMP/SYN/RAD)
  • 1x Crossfader (Scene A/B)
  • 3x Transport Buttons (Play/Stop/Rec)
  • 4x Mode Buttons
  • 4x Nav Buttons (MENU/BACK/SHIFT/PAGE)
  • 5x Function Buttons (DUB/FILL/CLR/SCENE/BANK)
  • 5-Way Joystick + PREV/NEXT
  • 13 encoders via 2x MCP23017 I2C expanders

Connectivity

  • WiFi 802.11 b/g/n
  • Bluetooth 4.2
  • GPS (NEO-6M)
  • AI API (Claude)

Physical

  • Size: 300 x 200 x 50mm
  • Weight: ~800g
  • Display: 5" IPS LCD (800x480, SPI)
  • Battery: 3-4 hours (3500mAh)

Teensy 4.1 Pin Assignments

FunctionPinsProtocolNotes
Audio Shield (I2S)2, 7, 20, 21, 23I2SSGTL5000 codec (RESERVED)
Touch Sensor (MPR121)18, 19, 15I2C + IRQAddress: 0x5A, IRQ on pin 15
5" LCD Display36, 37, 38SPIILI9488/RA8875 (CS, DC, RST)
Encoders 1-43-6, 8-12, 14, 24-25GPIOCLK, DT, SW per encoder
Buttons26-29GPIOMODE, SHIFT, REC, PLAY
NeoPixel LEDs30WS28128x RGB
ESP3216, 17UARTSerial2 @ 115200
GPIO Expander18, 19I2C2x MCP23017 for extra encoders
SD CardBuilt-inSDIO64GB for samples

Bill of Materials v3.1

European suppliers (Mouser.es, Farnell, Bricogeek) — prices verified Feb 2026

ComponentDescriptionQtyPrice
PROCESSORS & AUDIO
Teensy 4.1600MHz ARM Cortex-M71$29.75
Audio ShieldSGTL5000 codec1$13.75
ESP32-WROOMWiFi/BT module1$8.00
microSD Card64GB sample storage1$12.00
DISPLAY
5" IPS Display800x480 SPI LCD (ILI9488)1$55.00
USER INTERFACE
MPR121 Breakout12-ch touch sensor1$7.95
Copper TapeConductive, for pads1$6.00
Rotary EncodersWith push button13$20.00
Encoder KnobsAluminum 18mm13$18.00
Slide Faders45mm mixer faders4$12.00
Tactile ButtonsMode/Nav/Func (6x6mm)16$5.00
DJ Crossfader45mm slide1$12.00
5-Way JoystickNavigation module1$2.00
CONNECTIVITY & POWER
GPS ModuleNEO-6M with antenna1$12.00
Audio Jacks3.5mm stereo3$4.50
USB-C ConnectorPower + data1$2.00
LiPo Battery3500mAh 3.7V1$18.00
TP4056 ChargerUSB-C charging1$2.00
5V BoostBattery converter1$3.00
MCP23017I2C GPIO expander2$4.00
ENCLOSURE & MISC
EnclosureAluminum 300x200x50mm1$35.00
Acrylic PanelLaser-cut faceplate1$18.00
Prototype PCBCustom 2-layer PCB1$80.00
Passives KitCaps, resistors, ferrites-$15.00
HardwareScrews, standoffs, feet-$8.00
Wire/ConnectorsInternal wiring, headers-$12.00
TOTAL (Parts)~$420
+ Shipping/Tax (EU)~$60
GRAND TOTAL~$480