Gravity: UART & I2C NFC Module
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Gravity: UART & I2C NFC Module
The Gravity: UART & I2C NFC Module is built around the NXP PN532, a highly integrated NFC controller that supports a wide variety of NFC cards and tags, including MIFARE Classic and NTAG series.
This upgraded version adopts the Gravity standard PH2.0-4P interface, making it easy to switch between UART and I2C communication protocols. With improved PCB antenna design, this module ensures greater reading range and better signal quality.
It works seamlessly with popular 3.3V/5V controllers like Arduino, micro:bit, FireBeetle ESP32, and ESP8266.
About NFC
NFC (Near Field Communication) is a short-range, high-frequency communication technology that allows contactless data transmission within 10 cm. It evolved from RFID and is widely used for mobile payments, access control, ID authentication, and device pairing. NFC is also backward compatible with RFID and supports various modes such as reader/writer, card emulation, and peer-to-peer (P2P) communication.
Key Features
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NXP PN532 NFC controller with high integration
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Dual communication modes: I2C & UART composite interface
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Supports a wide range of NFC cards and tags
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Compatible with 3.3V / 5V controllers
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Gravity interface for plug-and-play development
Applications
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Contactless payment systems
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Smart card-based login or door access
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Bluetooth and Wi-Fi device pairing
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NFC-based smartphone interaction
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Social sharing (photos, videos, contacts)
Connection Diagram
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Arduino UNO I2C connection
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PC UART communication
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MEGA2560 UART wiring
Technical Specifications
| Parameter | Details |
|---|---|
| IC | NXP PN532 |
| Voltage | 3.3V ~ 5.5V |
| Interface | Gravity UART & I2C (PH2.0-4P) |
| UART Baud Rate | 115200 bps |
| I2C Address | 0x48 |
| Frequency | 13.56 MHz |
| Communication Distance | ≥10 mm (depends on card type) |
| Protocol Support | ISO/IEC 14443A/B, MIFARE, Felica |
| Card Emulation Mode | ISO 14443A / MIFARE Classic 1K or 4K, Felica |
| Peer-to-Peer Mode | ISO/IEC18092, ECM340 |
| Dimensions | 110 × 50 mm / 4.33 × 1.97 in |
| Weight | 20g |
Shipping List
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1 × Gravity: UART & I2C NFC Module
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1 × Gravity-4P I2C/UART Sensor Wire (PH2.0-4P)
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1 × XH2.54-2P Black Header
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1 × NFC Tag Sticker
Reference
Effective Date: March 27, 2025
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