HardLabs

FreeEEG32-alpha2

neuroidss·FreeEEG32-alpha2·KiCad/FreeEEG32-alpha2.kicad_pcb

FreeEEG32-alpha2 PCB layout, top view — open source ESP32 board by neuroidss

About the FreeEEG32-alpha2 PCB

FreeEEG32-alpha2 is an open source ESP32 PCB design by neuroidss, published on GitHub under the AGPL-3.0 license. It is a 4-layer board measuring 66 × 76.2 mm, with 202 components from 46 distinct parts.

Its main chip is the ESP32-WROOM-32, from the ESP32 family. Other key parts include the ADP7118AUJZ-3.3, 8.192MHz, ADR4525, ADUM1402BRWZ and SN6505B. By type, the board carries 142 capacitors, 22 ICs, 18 connectors, 10 resistors, 4 switches and 3 diodes.

Main components on the FreeEEG32-alpha2

ADP7118AUJZ-3.38.192MHzADR4525ADUM1402BRWZSN6505BESP32-WROOM-32CP2102N-28ISO7341c_spiAMS1117-3.3LSM6DS3AD7770CAT24M01WSTM32F427ZI_4side_short473521001

FreeEEG32-alpha2 bill of materials (BOM)

202 components, 46 distinct parts.

QtyPartRefs
2
ADP7118AUJZ-3.3
U1, U2
1
8.192MHz
U3
1
ADR4525
U4
2
ADUM1402BRWZ
U5, U9
1
SN6505B
U6
1
ESP32-WROOM-32
U7
1
CP2102N-28
U8
4
ISO7341c_spi
U10, U14, U15, U16
1
AMS1117-3.3
U11
1
LSM6DS3
U12
4
AD7770
U13, U20, U27, U34
1
CAT24M01W
U17
1
STM32F427ZI_4side_short
U37
1
473521001
U43
1
32768Hz
Y1
1
8MHz
Y2
2
Conn_02x07_Odd_Even
J1, J4
2
USB_C_Receptacle-Connector_VBUS2
J2, J11
6
Conn_01x02
J5, J7, J8, J9, J10, J12
1
Conn_02x20_Odd_Even
J6
Show 26 more
QtyPartRefs
4
CONN_02X10
P1, P2, P3, P4
3
USB_OTG
P6, P7, P8
1
NRST
SW1
1
BOOT0
SW2
1
RST
SW3
1
BOOT
SW4
1
da2303
T1
2
D_Schottky_SMD
D1, D2
1
SP0503BAHTG
D4
80
100n
C1, C5, C6, C7, C8, C9, C10, C11 +72
41
1u
C2, C12, C13, C14, C15, C29, C30, C31 +33
2
CL1
C3, C129
2
CL2
C4, C131
6
2.2u
C102, C119, C120, C122, C123, C124
2
4.7u
C106, C132
4
10u
C111, C113, C114, C117
2
22u
C121, C127
3
1n
C133, C136, C138
1
R_EXT
R1
2
4.7k
R2, R3
1
47.5k
R4
1
22.1k
R5
2
470
R6, R7
1
1k
R8
1
12k
R9
1
0
R10

FreeEEG32-alpha2 design files

The KiCad project lives in the neuroidss/FreeEEG32-alpha2 repository on GitHub; these links point at the commit this page was built from.

FreeEEG32-alpha2: common questions

What microcontroller does the FreeEEG32-alpha2 use?

The FreeEEG32-alpha2 is built around the ESP32-WROOM-32, from the ESP32 family.

How big is the FreeEEG32-alpha2 PCB?

The FreeEEG32-alpha2 measures 66 × 76.2 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the FreeEEG32-alpha2?

202 components, from 46 distinct parts. The full bill of materials is listed on this page.

Where can I download the FreeEEG32-alpha2 design files?

From the neuroidss/FreeEEG32-alpha2 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the FreeEEG32-alpha2 design in my own project?

Yes, under the terms of its AGPL-3.0 license, which neuroidss chose for the repository.

Can I test firmware for the FreeEEG32-alpha2 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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