Meet the NM-RF-HAT Companion CYD — a powerful multi-band RF companion expansion board built for ESP32-2432S028 (CYD) and compatible ESP32-S3 development boards. It brings together CC1101 Sub-GHz, nRF24L01 2.4GHz, PN532 NFC, IR TX/RX, RF433 OOK, GNSS expansion, power management, and a TF card slot in one compact, cleanly integrated board. Designed for advanced makers, hardware enthusiasts, and portable signal-analysis builds, it reduces external wiring and helps keep your CYD setup stable and organized. build Key Features: hub All-in-one expansion board — combines RF, NFC, IR, storage, GNSS expansion, and power-management functions into a single compact companion board settings_input_component Hardware RF Switch (DIP Switch) — allows hardware-level isolation between modules to reduce SPI bus conflicts, IO clashes, and unstable behavior settings_input_antenna CC1101 Sub-GHz module — dedicated 433MHz support for Sub-GHz testing, common RF analysis, and compatible low-frequency signal work sensors Integrated RF433 OOK TX/RX for simple 433MHz OOK signal send/receive workflows in supported projects wifi_tethering nRF24L01 2.4GHz module — supports compatible 2.4GHz wireless analysis and interaction in a compact onboard design contactless PN532 NFC — built-in 13.56MHz RFID / NFC support for read, write, and emulation tasks with compatible cards, tags, and test setups crop_free Dedicated rear NFC read area — optimized PCB antenna area for stronger and more reliable NFC card/tag coupling settings_remote Integrated IR TX/RX — ideal for infrared signal capture, replay, testing, and compatible remote-control experiments gps_fixed Dedicated GNSS header — ready for external GPS / GNSS module connection for location-based and field-use projects sd_card TF card slot plus extension support for storage-based functions and flexible data handling in supported firmware cable Simple assembly — designed for a clean stack-style setup with CYD, requiring only a minimal wire connection for installation battery_charging_full Built-in battery charging circuit, USB-C input, and BAT On/Off switch for portable-ready power design — battery not included developer_board Designed for ESP32-2432S028 (CYD) and compatible with ESP32-S3 boards, including support for Bruce firmware and similar ESP32-based projects construction Built for Stable Multi-Module Integration: Many CYD builds become unreliable when several modules share the same IO lines, SPI bus, and power paths. This can lead to interference, unstable operation, and complicated jumper-wire setups. The NM-RF-HAT Companion CYD is designed to solve that problem by keeping everything routed on one board with a dedicated hardware RF switching system. The result is a cleaner setup, easier installation, and better day-to-day stability for advanced portable builds. memory Technical Highlights: RF Modules: CC1101 (433MHz), nRF24L01 (2.4GHz), RF433 OOK TX/RX Utility Modules: PN532 NFC, IR TX/RX, TF card slot Power Features: USB-C input, battery charging circuit, BAT On/Off switch Expansion Headers: GNSS header, VCC + UART, Power + UART, TF extension Control Method: Hardware RF DIP switch for cleaner module isolation Coverage: Multi-band support with 433MHz + 2.4GHz + 13.56MHz NFC flash_on Example Use Cases: 📡 433MHz Sub-GHz signal testing and RF analysis 📶 2.4GHz wireless protocol experiments with nRF24L01 🏷️ NFC / RFID card, tag, and emulation testing 📍 GNSS-assisted field projects and mobile setups 🧪 Compact CYD-based diagnostics and portable hardware experimentation 🔌 Cleaner all-in-one expansion for advanced ESP32 projects verified Compatibility: This board is designed primarily for ESP32-2432S028 (Cheap Yellow Display / CYD) and also supports compatible ESP32-S3 development boards. It is intended for users building custom portable platforms, testing tools, and advanced integrated hardware projects that benefit from having multiple onboard modules in a single companion board. Important — Handmade Product Notice: This is a personal handmade product. Minor defects, small cosmetic variations, or future hardware revisions may exist. Returns or exchanges are not supported. Please purchase only if you accept handmade characteristics. ⚠️ Legal & Usage Disclaimer: This product is intended for learning, research, and hardware / signal analysis only. Do not use it for illegal activities. Compliance with local laws and regulations is the responsibility of the user. Important Power Note: This board includes a battery management / charging circuit, but no battery is included in the package. You must use your own compatible battery if needed for portable operation. Package Includes: • 1 × NM-RF-HAT Companion CYD board • Battery not included
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