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Edrumulus

corrados·edrumulus·hardware/prototype2/edrumulus.kicad_pcb

Edrumulus PCB layout, top view — open source ESP32 board by corrados

About the Edrumulus PCB

Edrumulus is an open source ESP32 PCB design by corrados, published on GitHub under the GPL-2.0 license. It is a 2-layer board measuring 128.9 × 80 mm, with 81 components from 20 distinct parts.

Its main chip is the ESP32-DEVKIT-V1, from the ESP32 family. Other key parts include the 6N138. By type, the board carries 43 resistors, 27 diodes, 9 connectors and 2 ICs.

It belongs with the audio and wearables designs in this gallery.

From the project

Open Source E-Drum Trigger Module

Edrumulus is a high quality Open Source e-drum trigger module software which runs on a micro processor.

Project requirements: - The trigger performance shall be similar to the Roland TD-27. - Overall latency should be as small as possible. The goal is to achieve a latency < 10 ms. - The required analog front end design shall be as simple as possible using the fewest number of parts possible.

Edrumulus, from the project README
From the project README

Main components on the Edrumulus

ESP32-DEVKIT-V16N138

Edrumulus bill of materials (BOM)

81 components, 20 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-DEVKIT-V1
U1
1
6N138
U2
1
CONN_01X24_SOCKET
Snare
J1
1
CONN_01X24_SOCKET
Hi-Hat
J2
1
CONN_01X24_SOCKET
Crash
J3
1
Ride
J4
1
Kick
J5
1
Tom3
J6
1
Tom1
J7
1
Tom2
J8
1
Hi-Hat Ctrl
J9
26
C191023
BAT85
D1, D2, D3, D4, D5, D6, D7, D8 +18
1
C191023
1N914
D27
7
10K
100 kOhm
R1, R2, R8, R25, R26, R27, R28
5
100K
100 kOhm
R3, R4, R5, R6, R7
23
10K
22 kOhm
R9, R11, R12, R13, R14, R15, R16, R17 +15
1
22 kOhm
R10
2
10K
10 kOhm
R37, R38
4
10K
220 Ohm
R39, R40, R41, R42
1
10K
4.7 kOhm
R43

Edrumulus design files

The KiCad project lives in the corrados/edrumulus repository on GitHub; these links point at the commit this page was built from.

Edrumulus: common questions

What microcontroller does the Edrumulus use?

The Edrumulus is built around the ESP32-DEVKIT-V1, from the ESP32 family.

How big is the Edrumulus PCB?

The Edrumulus measures 128.9 × 80 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Edrumulus?

81 components, from 20 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Edrumulus design files?

From the corrados/edrumulus repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Edrumulus design in my own project?

Yes, under the terms of its GPL-2.0 license, which corrados chose for the repository.

Can I test firmware for the Edrumulus 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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