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Marble sequencer control circuits

felicien-brochu·midi_marble_sequencer·hardware/pcb/pcb_controls_main/marble_sequencer_control_circuits.kicad_pcb

Marble sequencer control circuits PCB layout, top view — open source ESP32 board by felicien-brochu

About the Marble sequencer control circuits PCB

Marble sequencer control circuits is an open source ESP32 PCB design by felicien-brochu, published on GitHub. It is a 2-layer board measuring 112 × 81 mm, with 27 components from 13 distinct parts.

Its main chip is the ESP32-WROOM-32D_30_pins_devboard, from the ESP32 family. Other key parts include the HP4067_channel_select_buttons. By type, the board carries 15 resistors, 6 connectors, 2 ICs, 2 switches and 2 capacitors.

It belongs with the audio designs in this gallery.

From the project

A MIDI sequencer using marbles.

MIDI Marble Sequencer is a hardware + firmware project that detects marbles on IR sensor tracks and outputs MIDI over USB. The system is split into a main ESP-IDF firmware (sequencer + USB MIDI) and ESP32-based control boards (Arduino/PlatformIO) connected over I2C.

- hardware/ — CAD (SolidWorks parts/assemblies) and related manufacturing files. - software/ - midimarblesequencermain/ — main firmware (ESP-IDF) for the sequencer + USB MIDI. - midimarblesequencercontrolsmain/ — main control board firmware (PlatformIO/Arduino). - midimarblesequencercontrolspages/ — pages control board firmware…

Main components on the Marble sequencer control circuits

HP4067_channel_select_buttonsESP32-WROOM-32D_30_pins_devboard

Marble sequencer control circuits bill of materials (BOM)

27 components, 13 distinct parts.

QtyPartRefs
1
HP4067_channel_select_buttons
U1
1
ESP32-WROOM-32D_30_pins_devboard
U2
1
Conn_01x05_measure_control_rotary_buttons
J1
1
Conn_02x09_Channel_Select
J2
1
Conn_01x03_Pin_BPM_Pot_100KR
J3
1
Conn_01x04_Play_Pause_Button
J4
1
Conn_01x02_I2C
J5
1
Conn_01x02_Power_Supply
J6
2
SW_Push
SW1, SW2
1
C_0.1uF_HF_filter_104
C1
1
C_10uF_bulk_decoupling
C2
4
20KR
R1, R2, R3, R13
11
2KR
R4, R5, R6, R7, R8, R9, R10, R11 +3

Marble sequencer control circuits design files

The KiCad project lives in the felicien-brochu/midi_marble_sequencer repository on GitHub; these links point at the commit this page was built from.

Marble sequencer control circuits: common questions

What microcontroller does the Marble sequencer control circuits use?

The Marble sequencer control circuits is built around the ESP32-WROOM-32D_30_pins_devboard, from the ESP32 family.

How big is the Marble sequencer control circuits PCB?

The Marble sequencer control circuits measures 112 × 81 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Marble sequencer control circuits?

27 components, from 13 distinct parts. The full bill of materials is listed on this page.

Where can I download the Marble sequencer control circuits design files?

From the felicien-brochu/midi_marble_sequencer repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Marble sequencer control circuits design in my own project?

The repository has no license, so all rights stay with felicien-brochu. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Marble sequencer control circuits without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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