PN532 NFC/RFID module (I2C) with ESP32

Supply 3.3-5 V Bus I2C I2C address 0x24

Pins and ESP32 wiring

Pin	Role	ESP32 pin
GND	Ground	GND
VCC	Power	3V3
SDA	I2C data (SDA)	D21
SCL	I2C clock (SCL)	D22

Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.

Starter code (Arduino)

#include <Wire.h>

void setup() {
  Serial.begin(115200);
  Wire.begin(21, 22);  // SDA = GPIO 21, SCL = GPIO 22
  Wire.beginTransmission(0x24);
  bool found = Wire.endTransmission() == 0;
  Serial.println(found ? "PN532 NFC/RFID module (I2C) found at 0x24" : "Not found: check power, GND and SDA/SCL");
}

void loop() {}

Sources

NXP PN532 user manual, I2C address 0x48 8-bit (0x24 7-bit)
Elechouse PN532 NFC module v3 manual, Mode switches: I2C = switch 1 ON, switch 2 OFF

Try it in 3D in BoardPilot

BoardPilot Part data (JSON)

Part data: CC BY 4.0, free to reuse with credit to BoardPilot.

PN532 NFC/RFID module (I2C) with ESP32

Pins and ESP32 wiring

Starter code (Arduino)

Sources

Try it in 3D in BoardPilot

Related parts