HardLabs

Totpvault hardware

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

Totpvault hardware PCB layout, top view — open source ESP32 board by gfoudree

About the Totpvault hardware PCB

Totpvault hardware 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 15 × 40 mm, with 28 components from 18 distinct parts.

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

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.

Totpvault hardware, from the project README
From the project README

Main components on the Totpvault hardware

ESP32-C3CH343PUSBLC6-2SC6HT75xx-1-SOT89

Totpvault hardware bill of materials (BOM)

28 components, 18 distinct parts.

QtyPartRefs
1
ESP32-C3
U1
1
CH343P
U3
1
USBLC6-2SC6
U4
1
HT75xx-1-SOT89
U5
1
~
X16
1
Crystal_GND24
Y1
1
Conn_01x04_Socket
J2
1
Conn_01x02_Socket
J3
1
KT-0603R
D1
3
100nF
C1, C10, C12
6
1uF
C2, C8, C9, C13, C14, C15
2
22uF
C3, C4
2
20pF
C5, C6
1
10nF
C7
1
10uF
C11
1
100
R3
1
499
R4
2
10k
R5, R6

Totpvault hardware design files

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

Totpvault hardware: common questions

What microcontroller does the Totpvault hardware use?

The Totpvault hardware is built around the ESP32-C3, from the ESP32 family.

How big is the Totpvault hardware PCB?

The Totpvault hardware measures 15 × 40 mm, has 2 copper layers and is 0.79 mm thick.

How many components are on the Totpvault hardware?

28 components, from 18 distinct parts. The full bill of materials is listed on this page.

Where can I download the Totpvault hardware 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 Totpvault hardware 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 Totpvault hardware 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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