The Gravity: UART & I2C NFC Module is an advanced RFID reader built around the NXP PN532, a highly integrated NFC controller that supports a wide variety of NFC cards and tags for your Arduino NFC projects, including MIFARE Classic and NTAG series.

This upgraded PN532 NFC module 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 RFID reader module ensures greater reading range and better signal quality for your NFC module applications.

It works seamlessly as an Arduino NFC and RFID reader with popular 3.3V/5V controllers like Arduino, micro:bit, FireBeetle ESP32, and ESP8266, making the PN532 NFC module highly versatile.

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. The PN532 NFC module is also backward compatible with standard RFID reader systems and supports various modes such as reader/writer, card emulation, and peer-to-peer (P2P) communication for your Arduino NFC setups.

Features

• NXP PN532 NFC controller with high integration for precise RFID reader capabilities

• Dual communication modes: I2C & UART composite interface for flexible NFC module connections

• Supports a wide range of NFC cards and tags using the PN532 chip

• Compatible with 3.3V / 5V controllers like Arduino NFC systems

• Gravity interface for plug-and-play development with this PN532 NFC module

Applications

• Contactless payment systems powered by the PN532 NFC module

• Smart card-based login or door access using an RFID reader

• Bluetooth and Wi-Fi device pairing via Arduino NFC integration

• NFC-based smartphone interaction with the PN532 NFC module

• Social sharing (photos, videos, contacts)

Connection Diagram

• Arduino UNO I2C connection with the PN532 NFC module

• PC UART communication for RFID reader testing

• MEGA2560 UART wiring for Arduino NFC setups

Technical Specifications

Shipping List

• 1 Gravity: UART & I2C NFC Module (PN532 RFID Reader)

• 1 Gravity-4P I2C/UART Sensor Wire (PH2.0-4P)

• 1 XH2.54-2P Black Header

• 1 NFC Tag Sticker

Reference

Product wiki

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