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Hardware design

Open-Authenticator·hardware-design·kicad_project/open_authenticator.kicad_pcb

Hardware design PCB layout, top view — open source ESP32 board by Open-Authenticator
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About the Hardware design PCB

Hardware design is an open source ESP32 PCB design by Open-Authenticator, published on GitHub under the MIT license. It is a 2-layer board measuring 82 × 42 mm, with 56 components from 36 distinct parts.

Its main chip is the ESP32-WROOM-32, from the ESP32 family. Other key parts include the TPS22919DCKR, DS3231M, MCP73831-2-OT and TPS63001. By type, the board carries 18 capacitors, 18 resistors, 5 ICs, 5 switches, 4 connectors and 3 diodes.

It belongs with the power & battery designs in this gallery.

From the project

Hardware design files for open authenticator

This repository contains hardware design files and datasheets for the open authenticator. This project is in development and is not ready for release.

Small form factor of 82mm x 42mm Uses ESP32-WROOM-32D module Uses 128x64 0.96" inch OLED panel Uses DS3231 RTC with battery backup (CR2032) for timekeeping Powered by 3.7V 300 mAh LiPo battery Uses MCP73831 for charging LiPo battery Uses TPS63001 Buck Boost Converter IC for efficient 3.3V power supply, with input range from 1.8V - 5.5V Uses TPS22919 Load switch to control power to OLED and RTC chip Autoselect power source, i.e., battery or USB…

Hardware design, from the project README
From the project README

Main components on the Hardware design

TPS22919DCKRESP32-WROOM-32DS3231MMCP73831-2-OTTPS63001

Hardware design bill of materials (BOM)

56 components, 36 distinct parts.

QtyPartRefs
1
TPS22919DCKR
IC1
1
ESP32-WROOM-32
U1
1
DS3231M
U2
1
MCP73831-2-OT
U3
1
TPS63001
U4
1
DMP2305U-7
Q1
1
Conn_01x02_Female
J1
1
TYPE-C-31-M-17
J2
1
S2B-PH-SM4-TB(LF)(SN)
J3
1
SSD1306_ribbon
P1
1
3v
BT1
1
UP
SW1
1
DOWN
SW2
1
BOOT/SELECT
SW3
1
RESET
SW4
1
POWER SWITCH
SW5
1
SS14
D1
1
LED
D2
1
1N5819
D3
1
2.2 uH
L1
Show 16 more
QtyPartRefs
6
10uF 50V
C1, C4, C6, C8, C9, C11
2
0.1uF 50V
C2, C7
3
1uF 50V
C3, C5, C10
1
10uF 16V
C12
2
0.1uF 16V
C13, C14
1
4.7uF 16V
C15
1
2.2uF 16V
C16
2
1uF 16V
C17, C18
1
100
R1
5
4.7k
R2, R3, R7, R15, R16
5
10k
R4, R5, R6, R13, R14
1
1k
R8
2
100k
R9, R10
2
5.1k
R11, R12
1
310k
R17
1
910k
R19

Hardware design design files

The KiCad project lives in the Open-Authenticator/hardware-design repository on GitHub; these links point at the commit this page was built from.

Hardware design: common questions

What microcontroller does the Hardware design use?

The Hardware design is built around the ESP32-WROOM-32, from the ESP32 family.

How big is the Hardware design PCB?

The Hardware design measures 82 × 42 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Hardware design?

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

Where can I download the Hardware design design files?

From the Open-Authenticator/hardware-design repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Hardware design design in my own project?

Yes, under the terms of its MIT license, which Open-Authenticator chose for the repository.

Can I test firmware for the Hardware design 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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