HardLabs

PCBA-KNOT

intechstudio·knot·Electrical/Design/PCBA-KNOT/PCBA-KNOT.kicad_pcb

PCBA-KNOT PCB layout, top view — open source ESP32 board by intechstudio
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About the PCBA-KNOT PCB

PCBA-KNOT is an open source ESP32 PCB design by intechstudio, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 56 × 60 mm, with 110 components from 52 distinct parts.

Its main chip is the ESP32-S3-WROOM-1U, from the ESP32 family. Other key parts include the BL1551B, SESRV05-4, 74HC165, 6N137 and 74HC1G14GV. By type, the board carries 26 capacitors, 25 test points, 21 resistors, 17 ICs, 5 diodes and 4 connectors.

It belongs with the audio designs in this gallery.

From the project

Knot is the bridge between old-school MIDI gear like synthesizers, groove boxes, guitar pedals and neat USB MIDI devices. Leave out the computer from the equation and control instruments seamlessly with Grid - or any other - USB controller.

Knot is the bridge between old-school MIDI gear like synthesizers, groove boxes, guitar pedals and neat USB MIDI devices. Leave out the computer from the equation and control instruments seamlessly with Grid - or any other - USB controller.

You can find more info on the website or in the Knot - Starter's Guide.

The nightly firmware is an early release version of the stable release. As it is an early version, some issues could still persist. In the case of issues, please denote the usage of a nightly firmware in the issue report.

PCBA-KNOT, from the project README
From the project README

Main components on the PCBA-KNOT

ESP32-S3-WROOM-1UBL1551BSESRV05-474HC1656N13774HC1G14GVTPS5430DDAPMIC_MT9700LN1134A332MR-G

PCBA-KNOT bill of materials (BOM)

110 components, 52 distinct parts.

QtyPartRefs
1
ESP32-S3-WROOM-1U
U1
6
BL1551B
U2, U3, U4, U5, U10, U11
3
SESRV05-4
U6, U7, U9
1
74HC165
U8
2
6N137
U12, U13
1
74HC1G14GV
U14
1
TPS5430DDA
U15
1
PMIC_MT9700
U16
1
LN1134A332MR-G
U17
1
WST2011
Q1
1
WST3392
Q2
1
C42567
CN1
1
TYPE-C-32-M-12
J1
1
(NF)
J2
1
Conn_01x02
J3
2
AUDIO-TH_PJ-3200
BOOMELE
Audio1, Audio2
1
DC-C033D-5.5A-2.0
XKB Enterprise
DC1
2
C2905169
SW1, SW2
1
TC-1109DE-C-G
XKB Enterprise
SW3
1
ST-0-102-C03-N003-RS
YUEN FUNG(源丰)
SW4
Show 32 more
QtyPartRefs
1
DO
TP1
2
5V
TP2, TP10
6
G
TP3, TP6, TP13, TP18, TP21, TP25
1
TX
TP4
1
RX
TP5
1
UF2
TP7
1
ROM
TP8
1
GND
TP9
2
D-
TP11, TP14
2
D+
TP12, TP15
2
T
TP16, TP19
2
R
TP17, TP20
1
V1
TP22
1
V2
TP23
1
VBUS
TP24
3
UI_WS2812C-2020
D1, D2, D3
2
B340LA-13-F
D4, D5
2
MPZ2012S101AT000
FB1, FB2
1
SNR.8065.TYD220MT00
L1
2
1u
C1, C22
3
10u
C2, C20, C25
15
100n
C3, C4, C5, C6, C7, C8, C9, C11 +7
1
100n (NF)
C10
3
CS1E470M-CRE54
C17, C18, C19
1
10n
C21
1
CA45-C6R3K337T
C24
4
10k
R1, R2, R20, R21
4
1k
R5, R8, R9, R12
7
5k1
R6, R7, R10, R11, R16, R17, R18
3
220R
R13, R14, R15
1
10k (NF)
R19
2
3k3
R22, R23

PCBA-KNOT design files

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

PCBA-KNOT: common questions

What microcontroller does the PCBA-KNOT use?

The PCBA-KNOT is built around the ESP32-S3-WROOM-1U, from the ESP32 family.

How big is the PCBA-KNOT PCB?

The PCBA-KNOT measures 56 × 60 mm, has 4 copper layers and is 1 mm thick.

How many components are on the PCBA-KNOT?

110 components, from 52 distinct parts. The full bill of materials is listed on this page.

Where can I download the PCBA-KNOT design files?

From the intechstudio/knot repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the PCBA-KNOT design in my own project?

Yes, under the terms of its GPL-3.0 license, which intechstudio chose for the repository.

Can I test firmware for the PCBA-KNOT 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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