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Com4bbb

eurovibes·com4bbb

Com4bbb PCB layout, top view — open source ESP32 board by eurovibes

About the Com4bbb PCB

Com4bbb is an open source ESP32 PCB design by eurovibes, published on GitHub under the CERN-OHL-S-2.0 license. It is a 4-layer board measuring 54.6 × 86.4 mm, with 61 components from 29 distinct parts.

Its main chip is the ESP32-S3-WROOM-1, from the ESP32 family. Other key parts include the SP3485EN, R-78K5.0-0.5, AT24C512C-SSHD-T, ATECC608A-MAHDA and DS3231MZ. By type, the board carries 21 resistors, 16 diodes, 9 connectors, 7 ICs, 4 capacitors and 2 switches.

It belongs with the iot & wireless and wearables designs in this gallery.

From the project

RS485 / WiFi cape for Beaglebone black

The Beaglobone Black is a TI Sitara AM3359 ARM Cortex-A8 CPU based evaluation board with two 40pin 100mil pinsockets. These pinsockets can be used for additional functionality boards called capes. The com4bbb cape enhance the Beaglebone Black by a ESP32 based WiFi module and a RS485 tranceiver.

com4bbb is provided under the terms of the CERN-OHL-S license version 2 as provided in the LICENSES/CERN-OHL-S-2.0 file.

Com4bbb, from the project README
From the project README

Main components on the Com4bbb

SP3485ENR-78K5.0-0.5AT24C512C-SSHD-TATECC608A-MAHDADS3231MZUSBLC6-2SC6ESP32-S3-WROOM-1

Com4bbb bill of materials (BOM)

61 components, 29 distinct parts.

QtyPartRefs
1
SP3485EN
U101
1
R-78K5.0-0.5
U102
1
AT24C512C-SSHD-T
U103
1
ATECC608A-MAHDA
U104
1
DS3231MZ
U105
1
USBLC6-2SC6
U201
1
ESP32-S3-WROOM-1
U202
1
AO3400A
Q101
1
RS485
J101
1
PWR
J102
1
DCF77
J103
1
PPS
J104
1
PPSOUT
J105
1
USB_B_Micro
J201
1
JTAG
J202
2
BeagleBone_Black_Header
P8, P9
1
Reset
SW101
1
PWR
SW102
13
LED
D101, D102, D103, D104, D105, D106, D107, D108 +5
1
MRA4004T3G
D114
Show 9 more
QtyPartRefs
1
1N5819WS
D115
1
SK6812MINI-HS-012
D201
1
FerriteBead_Small
FB201
2
100n
C101, C102
2
1F
C103, C104
18
1k
R101, R102, R103, R104, R105, R106, R107, R108 +10
1
15
R118
1
100
R119
1
47k
R120

Com4bbb design files

The KiCad project lives in the eurovibes/com4bbb repository on GitHub; these links point at the commit this page was built from.

Com4bbb: common questions

What microcontroller does the Com4bbb use?

The Com4bbb is built around the ESP32-S3-WROOM-1, from the ESP32 family.

How big is the Com4bbb PCB?

The Com4bbb measures 54.6 × 86.4 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Com4bbb?

61 components, from 29 distinct parts. The full bill of materials is listed on this page.

Where can I download the Com4bbb design files?

From the eurovibes/com4bbb repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Com4bbb design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which eurovibes chose for the repository.

Can I test firmware for the Com4bbb 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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