Overview

ESP32_TOTP is a compact and secure Time-Based One-Time Password (TOTP) generator based on the ESP32 platform. This device is ideal for enhancing security in two-factor authentication (2FA) systems, such as Google Authenticator. By displaying time-sensitive codes on a small OLED screen and synchronizing with a Real-Time Clock (RTC) module, it offers reliable and accurate two-factor authentication for various applications.

Key Features

• TOTP Code Generation: Generates 6-digit TOTP codes compliant with RFC 6238, ensuring reliable security for authentication processes.
• Quick Assembly: The assembly and firmware flashing process can be completed in approximately 15 minutes.
• Long Battery Life: Designed for battery operation, with a life span of 2-3 months depending on the battery used.
• OLED Display: Features an SSD1306 128x64 I2C OLED display for clear visibility of generated codes.
• Charging Module: Integrated with an IP5310 battery charging module for convenient recharging.
• Accurate Timekeeping: Utilizes a DS3231 Real-Time Clock (RTC) module, ensuring precise time synchronization.
• Compact Design: Built on an ESP32-C3 SuperMini, minimizing hardware footprint without compromising functionality.

Software Functionality

• Configurable WiFi Settings: Allows for easy configuration of AP WiFi and password via a web-based interface utilizing a captive portal.
• Security Features: Includes a safeguard that resets secrets upon three unsuccessful pin code entry attempts, enhancing device security.

Hardware Requirements

A list of components is necessary to construct the ESP32_TOTP:

Part Name	Quantity	Purchase Link
ESP32-C3 SuperMini	1 PCS	AliExpress
DS3231SN RTC	1 PCS	AliExpress
SSD1306 OLED Display (128x64)	1 PCS	AliExpress
IP5310 Battery Charging Module	1 PCS	AliExpress
RT9080-33GJ5 Voltage Regulator	1 PCS	AliExpress
10K SMD Resistor	9 PCS	AliExpress
BAT54 KL1 Schottky Diode	1 PCS	AliExpress
1µF SMD Capacitor	2 PCS	AliExpress
SMD 3×4mm Tactile Button	4 PCS	AliExpress
MSK-12C02 Slide Switch	1 PCS	AliExpress
LI-ION battery from VAPE	1 PCS

Note: Ensure that the battery size does not exceed 42mm for proper fitment.

Additional Information

This project provides an educational and offline alternative for understanding TOTP generation, emphasizing that it is not intended to replace conventional mobile 2FA applications.

For more details, including setup steps, libraries used, and additional resources, refer to the complete documentation in the repository's README.