I've been struggling for the past few days to get the Elechouse PN532 V3 module working with an ESP32 over I2C. The PN532 module itself works fine with a Raspberry Pi. This is the circuit (not actually using SparkFun ESP32 board, just for reference)

This PlatformIO example uses the Adafruit PN532 library to interface with the PN532 module over I2C. It initializes the module, scans for NFC tags, and logs their UIDs to the Serial Monitor. The code can be extended to include additional NFC features like …

PN532 NFC reader for ESP32 WIFI DEVKIT 1. This example is for communicating with the PN532 chip using I2C. Wiring should be as follows: PN532 SDA -> EFM32 D21 Pin (with 4.7K resistor already present) PN532 SCL -> EFM32 D22 Pin(with 4.7K resistor already present) PN532 IRQ -> EFM32 D4 Pin; PN32 RST0 -> EFM32 D5 Pin; PN532 3.3v -> 3.3v; PN532 GND ...

Mar 26, 2024 · Hey!...I am using ESP32 - S2 DevKitC-1 v1 and i am trying to connect the PN532 to it inorder to do some NFC card detection. but the ESP32 is not connecting with the PN532 over the I2c Connections: SDA - GPIO_8

Oct 9, 2021 · ESP32-WROOM-32 DevKit v1 The NFC scanner I have is the PN532 and can be configured to communicate using SPI, I2C or High Speed UART. I want to look at I2C to reduce the number of pins I use.

Sep 14, 2021 · The PN532 requires I2C clock stretching. It doesn't work well over I2C with the ESP8266 or ESP32 (Adafruit has it working with the ESP32 under certain conditions - using an interrupt and being the only device on the I2C bus - you might try their driver). Your best solution is to connect it via SPI and not I2C. –

This is a port of the Adafruit PN532 Driver for the ESP32 using only the I2C Bus

Jun 27, 2020 · Unfortunately, the ESP32 I2C implementation doesn't support clock-stretching past 13ms, which doesn't seem to be long enough to work with the PN532, so you're not likely to get this working without fixing I2C on the ESP32. If you want to use it with an ESP32 or an ESP8266 I'd recommend using SPI rather than trying to get I2C to work.

Apr 29, 2022 · The NFC reader is a pn532 on the i2c bus, previously it was attached to a memos d1 mini, and was working great. I have had to change the Wemod due the pins number for the items I needed to attach, so that’s the reason of the ESP…

Oct 24, 2023 · I2C,SPI or HSU for ESP32-PN532? working on a project to do the following to replace a similar raspberry pi project. NFC card scanned by a PN532, NDEF data is Zlib inflated then the resultant data is sent over MQTT to a external server.