HardLabs

BigBrainFinal

ashvin-verma·BigBrainFinal·EEG_ESP4/EEG_ESP.kicad_pcb

BigBrainFinal PCB layout, top view — open source ESP32 board by ashvin-verma
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About the BigBrainFinal PCB

BigBrainFinal is an open source ESP32 PCB design by ashvin-verma, published on GitHub. It is a 2-layer board measuring 87.6 × 73.4 mm, with 43 components from 18 distinct parts.

Its main chip is the ESP32-S2-SOLO, from the ESP32 family. Other key parts include the AD8221ARZ, AP2127N-3.3 and CA3130. By type, the board carries 15 capacitors, 14 resistors, 7 ICs, 3 connectors and 2 switches.

From the project

Final Project for HOPE Fall '22. Low-cost EEG with 4 inputs and filtering.

Main components on the BigBrainFinal

AD8221ARZAP2127N-3.3CA3130ESP32-S2-SOLO

BigBrainFinal bill of materials (BOM)

43 components, 18 distinct parts — part numbers from the project's BOM.

QtyPartRefs
2
AD8221ARZ
U1, U6
1
AP2127N-3.3
U2
3
CA3130
U3, U4, U10
1
ESP32-S2-SOLO
U5
2
Conn_01x03_Male
J1, J4
1
USB-A1VSB6
J2
2
R_Potentiometer_Trim
RV1, RV2
2
SW_Push
SW1, SW2
4
10 uF
C2, C3, C11, C19
1
1 uF
C6
3
0.1 uF
C7, C10, C13
2
0.68 uF
C8, C18
2
0.0068 uF
C9, C17
3
0.01 uF
C12, C14, C21
2
2K2
R1, R14
4
15K
R2, R3, R4, R13
4
10K
R5, R6, R7, R12
4
1M
R8, R9, R10, R11

BigBrainFinal design files

The KiCad project lives in the ashvin-verma/BigBrainFinal repository on GitHub; these links point at the commit this page was built from.

BigBrainFinal: common questions

What microcontroller does the BigBrainFinal use?

The BigBrainFinal is built around the ESP32-S2-SOLO, from the ESP32 family.

How big is the BigBrainFinal PCB?

The BigBrainFinal measures 87.6 × 73.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the BigBrainFinal?

43 components, from 18 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 BigBrainFinal design files?

From the ashvin-verma/BigBrainFinal repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the BigBrainFinal design in my own project?

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

Can I test firmware for the BigBrainFinal 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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