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ESP32 TOTP A PHONE-LIKE PERSONAL SECURITY DEVICE
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An easy to build, personal security device that you can use to protect your accounts using 2FA
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Updated at source:
Model information
- Source
- Printables
- Category
- Portable Devices
- License
- Creative Commons — Attribution
ESP32_TOTP 🔐
A compact, secure TOTP (Time-Based One-Time Password) generator built on the ESP32 platform for two-factor authentication (2FA) systems like Google Authenticator. Displays time-based codes on a small OLED screen, synced with an RTC module for accurate timekeeping. Ideal for educational purposes and offline 2FA.
🚀 Features
- Generates 6-digit TOTP codes (RFC 6238 compliant)
- Assembly and flashing: ~15 minutes
- Battery life: 2-3 months (varies by battery)
- OLED display (SSD1306 128x64 I2C)
- Battery-powered with charging module (IP5310)
- Real-Time Clock (DS3231) for accurate timekeeping
- Compact hardware (ESP32-C3 SuperMini)
- Configurable AP WiFi and password
- Web-based configuration via captive portal
- Secrets reset after 3 incorrect pincode attempts
Follow the detailed instructions on GitHub for:
- Ordering the PCB
- Printing the case
- Assembling the PCB and case
- Flashing firmware
- Activating the device
🛠 Hardware (BOM)
| # | Part Name | Quantity | Link |
|---|---|---|---|
| 1 | ESP32-C3 SuperMini | 1 | AliExpress |
| 2 | DS3231SN RTC | 1 | AliExpress |
| 3 | SSD1306 OLED Display (128x64) | 1 | AliExpress |
| 4 | IP5310 Battery Charging Module | 1 | AliExpress |
| 5 | RT9080-33GJ5 Voltage Regulator | 1 | AliExpress |
| 6 | 10K SMD Resistor | 9 | AliExpress |
| 7 | BAT54 KL1 Schottky Diode | 1 | AliExpress |
| 8 | 1µF SMD Capacitor | 2 | AliExpress |
| 9 | SMD 3×4mm Tactile Button | 4 | AliExpress |
| 10 | MSK-12C02 Slide Switch | 1 | AliExpress |
| 11 | LI-ION battery (max 42mm) | 1 |
📝 Note
This project is an educational offline alternative for TOTP generation, not a replacement for mobile 2FA apps.