Using two RFID readers (PN532) on esp32. #9072
Description
Board
ESP32 DOIT DEVKIT V1
Device Description
My esp32 is connected to a relay, an Ethernet adapter, Buzzer and PN532 RFID Reader.
Hardware Configuration
The Pn532 reader is connected to the HSU.
Version
latest master (checkout manually)
IDE Name
Arduino IDE
Operating System
Windows 10
Flash frequency
40mhz
PSRAM enabled
yes
Upload speed
9600
Description
I need to connect two RFID readers to my esp32. Currently one reader is using the HSU input. When trying to configure a second reader to I2C, the readers conflict and only one works. Generally, I2C. I would like to know how I can make this work.
Sketch
#include <Wire.h>
#include <Adafruit_PN532.h>
#define SDA_PIN 21
#define SCL_PIN 22
#define SDA_HSU_PIN 17
#define SCL_HSU_PIN 16
Adafruit_PN532 nfcI2C(SDA_PIN, SCL_PIN);
Adafruit_PN532 nfcHSU(SDA_HSU_PIN, SCL_HSU_PIN);
void setup(void) {
Serial.begin(115200);
delay(1000);
Serial.println("Configurando leitor I2C...");
nfcI2C.begin();
nfcI2C.SAMConfig();
Serial.println("Configurando leitor HSU...");
nfcHSU.begin();
nfcHSU.SAMConfig();
}
void loop(void) {
uint8_t success;
uint8_t uid[] = { 0, 0, 0, 0, 0, 0, 0 };
uint8_t uidLength;
success = nfcI2C.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength);
if (success) {
Serial.println("Tag found at I2C!");
printUID(uid, uidLength);
}
success = nfcHSU.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength);
if (success) {
Serial.println("Tag found at HSU!");
printUID(uid, uidLength);
}
delay(1000);
}
void printUID(uint8_t *uid, uint8_t uidLength) {
Serial.print("UID: ");
for (uint8_t i = 0; i < uidLength; i++) {
Serial.print(" 0x");
if (uid[i] < 0x10) {
Serial.print("0");
}
Serial.print(uid[i], HEX);
}
Serial.println("");
}Debug Message
Dont have.
Other Steps to Reproduce
No response
I have checked existing issues, online documentation and the Troubleshooting Guide
- I confirm I have checked existing issues, online documentation and Troubleshooting guide.