Not conecting pn532 blue RFID to arduino nano esp32 I2C

Projects General Guidance
1

xc
xc1920×1080 256 KB

// ULTIMATE PN532 TEST CODE
#include <Wire.h>

// Try these pin combinations IN ORDER:
 #define SDA_PIN 8   // D5 - Try FIRST
 #define SCL_PIN 9   // D6
//#define SDA_PIN 21  // D10 - Try SECOND
//#define SCL_PIN 18  // D9
// #define SDA_PIN 11  // A4 - Try THIRD
// #define SCL_PIN 12  // A5

void setup() {
  Serial.begin(115200);
  delay(2000);  // Wait for serial
  
  Serial.println("\n=================================");
  Serial.println("PN532 PRECISE MODULE TESTER");
  Serial.println("=================================");
  
  Serial.println("\n⚙️  CONFIGURATION CHECK:");
  Serial.println("1. Module should say: 'PN532 NFC Precise'");
  Serial.println("2. Look for SEL0/SEL1 or I2C/SPI/HSU pads");
  Serial.println("3. For I2C: Bridge SEL0 and SEL1");
  Serial.println("4. Power: 3.3V (NOT 5V!)");
  Serial.println("=================================\n");
  
  Wire.begin(SDA_PIN, SCL_PIN);
  
  // Test I2C communication
  testI2C();
}

void testI2C() {
  Serial.println("🔍 Scanning I2C bus...");
  Serial.println("(Common PN532 addresses: 0x24, 0x48)");
  
  byte foundCount = 0;
  
  // Try standard PN532 addresses
  uint8_t pn532Addresses[] = {0x24, 0x48, 0x42, 0x4E};
  
  for(int i = 0; i < 4; i++) {
    Wire.beginTransmission(pn532Addresses[i]);
    byte error = Wire.endTransmission();
    
    if(error == 0) {
      Serial.print("\n✅ SUCCESS! Found PN532 at 0x");
      Serial.println(pn532Addresses[i], HEX);
      Serial.println("   I2C mode is WORKING correctly!");
      foundCount++;
      
      // Additional test
      testPN532Communication(pn532Addresses[i]);
    }
  }
  
  if(foundCount == 0) {
    Serial.println("\n❌ NO PN532 FOUND!");
    Serial.println("\n🔧 TROUBLESHOOTING STEPS:");
    Serial.println("1. CHECK MODE SETTINGS:");
    Serial.println("   • Find SEL0/SEL1 pads on your module");
    Serial.println("   • BRIDGE BOTH with solder or wire");
    Serial.println("   • OR find I2C pads and bridge them");
    
    Serial.println("\n2. CHECK WIRING:");
    Serial.println("   PN532 SDA → D5 (GPIO8)");
    Serial.println("   PN532 SCL → D6 (GPIO9)");
    Serial.println("   PN532 VCC → 3.3V (NOT 5V!)");
    Serial.println("   PN532 GND → GND");
    
    Serial.println("\n3. TRY DIFFERENT PINS:");
    Serial.println("   Change code to use D10/D9 instead");
    
    Serial.println("\n4. ADD PULL-UP RESISTORS:");
    Serial.println("   Connect 4.7kΩ from SDA to 3.3V");
    Serial.println("   Connect 4.7kΩ from SCL to 3.3V");
  }
}

void testPN532Communication(uint8_t address) {
  Serial.println("\n📡 Testing PN532 communication...");
  
  // Send wakeup command
  Wire.beginTransmission(address);
  Wire.write(0x00);  // Preamble
  Wire.write(0x00);  // Start code
  Wire.write(0xFF);  // Wakeup
  byte error = Wire.endTransmission();
  
  if(error == 0) {
    Serial.println("✅ PN532 responding correctly!");
  } else {
    Serial.println("⚠️  PN532 found but not responding");
  }
}

void loop() {
  // Blink built-in LED if pin 13 exists
  static unsigned long lastBlink = 0;
  if(millis() - lastBlink > 1000) {
    lastBlink = millis();
    digitalWrite(13, !digitalRead(13));
  }
}
2

What is the question and where is the schematic?

Here’s some help: How to get the best out of this forum - Projects / General Guidance - Arduino Forum

3

km
km607×1080 85 KB

4

Please read the advice in the link again.

Mystery photos are of no help.