HardLabs

Usba connector

gfoudree·TOTPVault·totpvault-hardware/usba-connector/usba-connector.kicad_pcb

Usba connector PCB layout, top view — open source ESP32 board by gfoudree

About the Usba connector PCB

Usba connector is an open source ESP32 PCB design by gfoudree, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 17.1 × 37.8 mm, with 30 components from 17 distinct parts.

Its main chip is the ESP32-C3, from the ESP32 family. Other key parts include the HT75xx-1-SOT89, CH343P and USBLC6-2SC6. By type, the board carries 15 capacitors, 4 ICs, 4 resistors, 2 crystals, 2 switches and 2 diodes.

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

From the project

A secure hardware vault for storing TOTP codes for two-factor authentication

TOTPVault is a secure hardware vault for storing TOTP codes for two-factor authentication. It is compatible with websites and applications which support authenticators such as Google Authenticator or Authy.

TOTPVault uses an RISC-V ESP32-C3 microcontroller to perform cryptographic operations and storage/generation of TOTP codes with a separate chip to run an isolated USB stack.

Usba connector, from the project README
From the project README

Main components on the Usba connector

ESP32-C3HT75xx-1-SOT89CH343PUSBLC6-2SC6

Usba connector bill of materials (BOM)

30 components, 17 distinct parts.

QtyPartRefs
1
ESP32-C3
U1
1
HT75xx-1-SOT89
Holtek Semicon
U2
1
CH343P
U3
1
USBLC6-2SC6
U4
1
~
X1
1
Crystal_GND24
Y1
1
Conn_01x05_Socket
J3
1
DFU Tactile Button, 160gf
XUNPU
S1
1
Reset Tactile Button, 160gf
XUNPU
S2
2
KT-0603R
Hubei KENTO Elec
D1, D2
2
20pF
FH(Guangdong Fenghua Advanced Tech)
C1, C2
6
1uF
Samsung Electro-Mechanics
C3, C5, C8, C10, C12, C14
3
10uF
Samsung Electro-Mechanics
C4, C6, C15
3
100nF
Samsung Electro-Mechanics
C7, C11, C13
1
10nF
Samsung Electro-Mechanics
C9
2
400
UNI-ROYAL(Uniroyal Elec)
R1, R2
2
10k
UNI-ROYAL(Uniroyal Elec)
R3, R4

Usba connector design files

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

Usba connector: common questions

What microcontroller does the Usba connector use?

The Usba connector is built around the ESP32-C3, from the ESP32 family.

How big is the Usba connector PCB?

The Usba connector measures 17.1 × 37.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Usba connector?

30 components, from 17 distinct parts. The full bill of materials is listed on this page.

Where can I download the Usba connector design files?

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

Can I use the Usba connector design in my own project?

Yes, under the terms of its GPL-3.0 license, which gfoudree chose for the repository.

Can I test firmware for the Usba connector 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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