2 layers100 × 100 mm
Midi arm
michar71/midi_arm2
Red,Green,Blue -> Boot Yellow -> Ready for Connection Green -> Connection initiated
21 parts1
2 layers100 × 100 mm
Midi arm panelize
michar71/midi_arm21Red,Green,Blue -> Boot Yellow -> Ready for Connection Green -> Connection initiated
- Size
- 100 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 126
- Nets
- 34
- Pads
- 528
- Tracks, vias
- 1,482, 72
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 10 Sep 2023
- Updated
- 16 Jan 2026
Overview
Midi arm panelize is an open-source printed circuit board by michar71, from the michar71/midi_arm2 repository on GitHub. It is a 2-layer board of 100 × 100 mm with 126 parts on 34 nets, routed with 1,482 tracks and 72 vias.
It is built around the WS2812B. Its parts include 60 resistors, 24 ICs, 12 diodes, 12 connectors and 12 switches. It belongs with the audio and music boards of this library.
Main components
1README
README.mdmidi_arm2
BABOI Update
- Download .bin Firmware File
- Power Up BABOI
- Connect Computer o Phone to BABOI Access Point
- Go to webapge 192.168.1.1 in browser
- Select "Update"
- Select firmware File
##Processing Sketch update Just copy the .app file in the relase folder to your computer
LED's
Left LED
Red,Green,Blue -> Boot Yellow -> Ready for Connection Green -> Connection initiated
Right LED
Off > Not Connected Red > Pause Green > Live Blue > Acc/Gyro Cal Cyan > Mag Cal Magenta > Button Cal White > Glove Tension Strip Cal
Buttons
Left
CTRL-Button Short Press > Live/Pause Toggle Long Press > Gyro/Accelerometer Calibration Very Long Press > Mag Calibration
Front
A-Button
Right
B-Button
Calibration
- Best Way to calibrate is from the webpage
- Buttons might not work correctly initially. Calibrate from Webpage...
- Gyro/Accelerometer Calibration can be triggered both by 3 sec button press or webpage.
- Button/Mag calibration can only be triggered from webpage.
- If in doubt reset settings from webpage... (That will force a button recalibration on next start...)
Network
- Enable Network support in App
- Connect computer to "BABOI" access point
- Web Page is available at 192.168.1.1
- VPN/Firewall might enterfere. Traffic is on Port 2255. Connection is established via Broadcast, then communication switches to unicast.
Parts
126| Qty | Value | Footprint | References |
|---|---|---|---|
| 36 | 33K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R1, R1, R1, R1, R1, R2, R2, R2, R2, R2, R2, R3, R3, R3, R3 +20 |
| 12 | 10K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5, R5, R5, R5, R5, R5, R7, R7, R7, R7, R7, R7 |
| 12 | 51K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R13, R13, R13, R13, R13, R13, R14, R14, R14, R14, R14, R14 |
| 12 | WS2812B | LED_SMD:LED_WS2812B_PLCC4_5.0x5.0mm_P3.2mm | D1, D1, D1, D1, D1, D1, D2, D2, D2, D2, D2, D2 |
| 6 | Conn_01x05_Pin | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J4, J4, J4, J4, J4, J4 |
| 6 | Conn_01x06_Socket | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J1, J1, J1, J1, J1, J1 |
| 6 | MountingHole | MountingHole:MountingHole_2mm | H1, H1, H1, H1, H1, H1 |
| 6 | SW_DIP_x01 | Button_Switch_SMD:SW_Push_SPST_NO_Alps_SKRK | SW2, SW2, SW2, SW2, SW2, SW2 |
| 6 | SW_MEC_5E | midi_arm:SW_Push_SMD | SW1, SW1, SW1, SW1, SW1, SW1 |
| 6 | ~ | midi_arm:GY-85 | U4, U4, U4, U4, U4, U4 |
| 6 | ~ | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1, U1, U1, U1, U1, U1 |
| 6 | ~ | midi_arm:9250_MOD | U2, U2, U2, U2, U2, U2 |
| 6 | ~ | midi_arm:ESP32-C3_SuperMini | U3, U3, U3, U3, U3, U3 |
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Questions
How big is the Midi arm panelize PCB?
It measures 100 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Midi arm panelize use?
126 parts, built around the WS2812B. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Midi arm panelize KiCad files?
From the michar71/midi_arm2 repository on GitHub, at the commit this page was made from: the board is board/midi_arm/midi_arm_panelize.kicad_pcb and its schematic board/midi_arm/midi_arm.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Midi arm panelize design in my own project?
Its repository states no licence, so its author keeps all rights: ask michar71 before reusing the design.