HardLabs

Main board

card-io-ecg·card-io-hw·main_board/main_board.kicad_pcb

Main board layout, top view — open source ESP32 board by card-io-ecg

About the Main board

Main board is an open source ESP32 PCB design by card-io-ecg, published on GitHub. It is a 4-layer board measuring 85 × 55 mm, with 51 components from 36 distinct parts.

Its main chip is the ESP32-S3, from the ESP32 family. Other key parts include the SSD1306, TLV62568PDRLT, MCP73832, DW01 and 8205A. By type, the board carries 20 capacitors, 17 resistors, 7 ICs, 1 module, 1 transistor and 1 crystal.

From the project

Card/IO open source ECG hardware design

Card/IO is an open source, single lead ECG in a business card-like format.

The project contains two PCB designs, created using KiCAD 7:

- main_board: main/carrier board, which is a 4 layer PCB containing the MCU, display, battery and related circuitry - frontend: the ECG frontend, ADC, and touch detection/wakeup generator, implemented as a solder-on daughter board

Main components on the Main board

SSD1306ESP32-S3TLV62568PDRLTMCP73832DW018205AMAX17055

Main board bill of materials (BOM)

51 components, 36 distinct parts.

QtyPartRefs
1
SSD1306
U1
1
ESP32-S3
U2
1
TLV62568PDRLT
U3
1
MCP73832
U4
1
DW01
U5
1
8205A
U6
1
MAX17055
U7
1
~
M1
1
NX3008PBK,215
Q3
1
SC32S-7PF20PPM
Y1
1
USB4105-GF-A-060
J1
1
Battery_Cell
BT1
1
BAT54C
D1
1
TYA40124R7M-10
4.7uH
L1
4
1u
C1, C2, C3, C4
2
2.2u
C5, C6
1
22u
C7
3
100n
C8, C9, C14
2
7p
C12, C13
2
CL10A105KP8NNWC
1u
C15, C19
Show 16 more
QtyPartRefs
1
JMK107ABJ106MA-T
10u
C16
1
C0603C330M5HACTU
33p
C17
2
0805X226M6R3CT
22u
C18, C20
1
CL10A105KP8NNWC
100n
C21
1
CL10A105KP8NNWC
470n
C22
1
390k
R1
1
100k
R2
3
1M
R3, R4, R5
1
RC0603FR-072KL
100
R6
1
RC0603JR-07100KL
100k
R7
1
RC0603FR-0722KL
22k
R8
3
5k1
R9, R11, R12
1
10k
R13
3
RC0603FR-072KL
5k1
R14, R19, R20
1
1k
R15
1
0R02
R18

Main board design files

The KiCad project lives in the card-io-ecg/card-io-hw repository on GitHub; these links point at the commit this page was built from.

Main board: common questions

What microcontroller does the Main board use?

The Main board is built around the ESP32-S3, from the ESP32 family.

How big is the Main board?

The Main board measures 85 × 55 mm, has 4 copper layers and is 0.8 mm thick.

How many components are on the Main board?

51 components, from 36 distinct parts. The full bill of materials is listed on this page.

Where can I download the Main board design files?

From the card-io-ecg/card-io-hw repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Main board design in my own project?

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

Can I test firmware for the Main board 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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