SI
Sentinel Integrations
← Back to Research Index

Hardware Research Brief: ESP32-DIV (Open-Source Flipper Zero Alternative)

🎯 Executive Summary

ESP32-DIV is a 100% open-source, multi-band wireless security and penetration testing toolkit designed as a low-cost, fully customizable alternative to the Flipper Zero. Built around the ESP32-S3 dual-core MCU, it combines Wi-Fi, Bluetooth, Sub-1GHz (CC1101), Infrared, RFID/NFC, and GPS into a single modular handheld form factor.

Unlike proprietary closed-firmware hardware, ESP32-DIV provides open Gerber files, schematics, modular C++ firmware, and a 30-second WebSerial browser flasher.

🛠️ Hardware Configurations & Specs

┌───────────────────────────────────────────────────────────┐
│ ESP32-S3 Main Board (Dual-Core, Wi-Fi & BLE Native)       │
├───────────────────────────────────────────────────────────┤
│ Bottom Expansion Shield Header                             │
│                                                           │
│  • Sub-1GHz RF: CC1101 Transceiver (300MHz–928MHz)       │
│  • Infrared: IR TX/RX Diodes                              │
│  • RFID / NFC: PN532 / RC522 (125kHz / 13.56MHz)          │
│  • Geolocation: NMEA GPS Module                           │
│  • Storage: MicroSD Card Slot (PCAP & Sub-GHz Dumps)      │
└───────────────────────────────────────────────────────────┘

Form Factor Hardware Presets

1. v1 (Original): Compact, integrated all-in-one entry board.

2. v2 (Current Main): Improved trace routing, noise isolation, and bottom expansion shield header system.

3. CYD Preset: Compatible with off-the-shelf "Cheap Yellow Display" (ESP32-2432S028) boards for ultra-low-cost DIY builds ($10–$15).

📡 Protocol & Radio Capabilities

| Radio Protocol | Hardware Component | Practical Capabilities |

| :--- | :--- | :--- |

| Sub-1GHz | Texas Instruments CC1101 | Signal sniffing, RAW signal capture/replay (garage doors, keyfobs, RF remotes), Sub-GHz jamming/testing. |

| 2.4GHz Wi-Fi | ESP32-S3 Native Radio | Wi-Fi deauth, probe request logging, beacon spamming, PCAP packet capture to SD card. |

| Bluetooth / BLE | ESP32-S3 Native Radio | BLE advertisement spamming, device discovery, GATT service enumeration. |

| Infrared (IR) | IR LED Array + Receiver | Universal remote emulation, TV-B-Gone, raw IR signal learning & dump storage. |

| RFID / NFC | PN532 / RC522 | 125kHz badge reading/cloning, 13.56MHz MIFARE tag reading & emulation. |

| GPS | NMEA Serial GPS | Wardriving, geolocated Wi-Fi/RF packet mapping saved to MicroSD. |

💻 Firmware & Deployment Pipeline

1. WebSerial Flasher (cifertech.github.io/ESP32-DIV): One-click Chrome/Edge browser flashing in under 60 seconds with no toolchain installation.

2. DIV Flasher Desktop App: Offline Windows/Linux GUI flasher utilizing esptool binaries.

3. Arduino / PlatformIO Build System:

* Modular architecture: Each protocol is isolated in separate .cpp/.h files under protocol folders.

* Centralized pin mapping via BoardConfig.h supporting v1, v2, and CYD hardware.

📌 Strategic Takeaways for Hardware Security Testing

1. Sovereign DIY Hardware Benchmark: Provides a completely open-source, non-walled-garden hardware platform for RF, Wi-Fi, and IoT security auditing.

2. CYD Compatibility: Supports $12 off-the-shelf ESP32 display boards, drastically lowering the barrier to entry for local RF testing tools.

3. Firmware Modularity: Clean C++ codebase organized by protocol makes it ideal for integrating custom agentic control protocols or local subagent telemetry hooks.