On Mon, May 1, 2023 at 05:58 PM, <stephenjohnson500@...> wrote:
MFRC522, Nano/Uno/Mega, Serial/Ethernet
Tom,
I tried this latest version of the sketch on two combinations. The first was an Uno and single reader being used in Serial mode. Unfortunately it didn't work as hoped. It detected all six readers despite only one being connected. It didn't read any tags either on the Serial Monitor or JMRI.
The second combination was an Uno, Ethernet Shield and single reader. Again, it listed all six readers despite just one being connected. In did not read any tags in Serial Mode either on the Serial Monitor or JMRI. I then tried it with it connected to the network. Again it listed all readers, but would not read any tags on the Serial Monitor or JMRI. Switching JMRI to the network connection now. It listed all readers, then came up with 'Client Connected'. Unfortunately, it didn't read any tags. So we seem to have gone backwards here somewhere.
Just as a check on the hardware, I uploaded the Serial only sketch to the Uno/Reader combo. It listed one reader with the right connection and read the tags correctly. So that combo was okay. I then uploaded v6 of the Ethernet/Serial sketch to the Uno, Ethernet Shield and Reader combo. It correctly identified the reader and its connection, but as before, would only read a tag when connected to JMRI. So, same as before, but working as before and therefore correctly.
So I'm not sure what's happened there Tom? I wish I knew a bit more about coding but the Reader ID issue seems to have gone back to v5, which was solved in v6. I imagined that the Ethernet connection would be a sort of 'if, then, else' sort of argument. So IF the the shield is connected, THEN?connect to client and transmit the data on the Network and Serial, ELSE do not connect to client and transmit data on Serial only. I'm not sure if that sort of argument works on an Arduino, does it?
Anyway, hopefully you will have a few ideas on this.
Steve,
Yeah, try this. The updated sketch:
?
Detects the type of board it's running on (Nano, Uno, or Mega) and sets the SS/RST pins accordingly.
Determines the ReaderID based on the SS/RST pins used, not simply the number of readers connected.
Blinks the LED to match the number of detected readers.
Sends output to the Serial connection in all cases, even if the Ethernet shield is not connected.
If connected, the output is sent via both Serial and Ethernet connections.
The output consists of 16 ASCII characters: ReaderID, 5 bytes of tag data, the checksum for those 5 bytes, a CR (carriage return), LF (line feed), and '>'.
This sketch handles multiple RFID readers, performs self-tests during setup, and sends card data through the serial or Ethernet connection depending on the Ethernet shield status.
?
// Import Libraries
#include <SPI.h>? ? ? ? ? ?// SPI library for communicating with the MFRC522 reader
#include <MFRC522.h>? ? ? ?// MFRC522 library for reading RFID cards
#include <Ethernet.h>? ? ? // Ethernet library for the Ethernet shield
?
// Ethernet configuration
byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
IPAddress ip(192, 168, 1, 177); // Replace with the desired IP address
unsigned int serverPort = 8888;? // Replace with the desired port number
?
EthernetServer server(serverPort);
?
// Define the SS (Slave Select) and RST (Reset) pins for each reader
#if defined(ARDUINO_AVR_UNO) || defined(ARDUINO_AVR_NANO)
const uint8_t ssPins[] = {5, 6, 7, A0, A1, A2};
const uint8_t rstPins[] = {4, 8, 9, A3, A4, A5};
const uint8_t readerAssignment[] = {1, 2, 3, 4, 5, 6}; // Assign reader numbers based on SS and RST pins
#elif defined(ARDUINO_AVR_MEGA2560)
const uint8_t ssPins[] = {5, 6, 7, 8, 9, A0, A1, A2};
const uint8_t rstPins[] = {22, 23, 24, 25, 26, 27, 28, 29};
const uint8_t readerAssignment[] = {1, 2, 3, 4, 5, 6, 7, 8}; // Assign reader numbers based on SS and RST pins
#endif
?
const int numReaders = sizeof(ssPins) / sizeof(ssPins[0]);
const char readerID[] = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H'};
?
struct RFIDReader {
? char id;
? uint8_t ssPin;
? uint8_t rstPin;
? MFRC522 mfrc522;
? byte nuid[7];
? bool isConnected;
?
? RFIDReader() : id(0), ssPin(0), rstPin(0), mfrc522(MFRC522(0, 0)), isConnected(false) {}
};
?
RFIDReader readers[numReaders];
EthernetClient client;
bool isEthernetConnected = false;
?
void setup() {
? Serial.begin(9600);
? SPI.begin();
? pinMode(10, OUTPUT);
? digitalWrite(10, HIGH);
?
? // Set pin 53 as OUTPUT for the Arduino Mega 2560
? #if defined(ARDUINO_AVR_MEGA2560)
? ? pinMode(53, OUTPUT);
? #endif
?
? pinMode(4, OUTPUT);
? digitalWrite(4, HIGH);
?
? Ethernet.begin(mac, ip);
? delay(1000);
?
? if (Ethernet.hardwareStatus() == EthernetNoHardware || Ethernet.linkStatus() == LinkOFF) {
? ? Serial.println("Ethernet shield not connected or network not available");
? ? isEthernetConnected = false;
? } else {
? ? isEthernetConnected = true;
? }
?
? for (uint8_t i = 0; i < numReaders; i++) {
? ? readers[i].ssPin = ssPins[i];
? ? readers[i].rstPin = rstPins[i];
? ? readers[i].id = readerID[readerAssignment[i] - 1]; // Assign the reader ID based on readerAssignment array
? ? readers[i].mfrc522 = MFRC522(readers[i].ssPin, readers[i].rstPin);
? ? readers[i].mfrc522.PCD_Init();
?
? ? // Check if the reader is connected
? ? if (readers[i].mfrc522.PCD_PerformSelfTest()) {
? ? ? readers[i].isConnected = true;
? ? ? readers[i].mfrc522.PCD_SetAntennaGain(readers[i].mfrc522.RxGain_max);
?
? ? ? // Print debugging information
? ? ? Serial.print("Reader ");
? ? ? Serial.print(readers[i].id);
? ? ? Serial.print(" detected on SS pin ");
? ? ? Serial.println(readers[i].ssPin);
? ? } else {
? ? ? readers[i].isConnected = false;
? ? }
? }
?
? if (isEthernetConnected) {
? ? server.begin();
? }
?
? // Blink the LED to indicate the number of detected readers
? pinMode(LED_BUILTIN, OUTPUT);
? for (int i = 0; i < numReaders; i++) {
? ? if (readers[i].isConnected) {
? ? ? digitalWrite(LED_BUILTIN, HIGH);
? ? ? delay(300);
? ? ? digitalWrite(LED_BUILTIN, LOW);
? ? ? delay(300);
? ? }
? }
}
?
void loop() {
? if (isEthernetConnected) {
? ? if (!client.connected()) {
? ? ? client.stop();
? ? ? client = server.accept();
? ? ? if (client) {
? ? ? ? Serial.println("Client connected");
? ? ? }
? ? }
? }
?
? for (uint8_t i = 0; i < numReaders; i++) {
? ? if (readers[i].isConnected && readers[i].mfrc522.PICC_IsNewCardPresent() && readers[i].mfrc522.PICC_ReadCardSerial()) {
? ? ? for (uint8_t j = 0; j < readers[i].mfrc522.uid.size; j++) {
? ? ? ? readers[i].nuid[j] = readers[i].mfrc522.uid.uidByte[j];
? ? ? }
?
? ? ? byte checksum = readers[i].nuid[0];
? ? ? for (uint8_t j = 1; j < 5; j++) {
? ? ? ? checksum ^= readers[i].nuid[j];
? ? ? }
?
? ? ? // Send output to Serial connection
? ? ? Serial.write(readers[i].id);
?
? ? ? if (isEthernetConnected && client.connected()) {
? ? ? ? // Send output to Ethernet client
? ? ? ? client.write(readers[i].id);
? ? ? }
?
? ? ? for (uint8_t j = 0; j < 5; j++) {
? ? ? ? // Send output to Serial connection
? ? ? ? Serial.print(readers[i].nuid[j] < 0x10 ? "0" : "");
? ? ? ? Serial.print(readers[i].nuid[j], HEX);
?
? ? ? ? if (isEthernetConnected && client.connected()) {
? ? ? ? ? // Send output to Ethernet client
? ? ? ? ? client.print(readers[i].nuid[j] < 0x10 ? "0" : "");
? ? ? ? ? client.print(readers[i].nuid[j], HEX);
? ? ? ? }
? ? ? }
?
? ? ? // Send output to Serial connection
? ? ? Serial.print(checksum < 0x10 ? "0" : "");
? ? ? Serial.print(checksum, HEX);
?
? ? ? if (isEthernetConnected && client.connected()) {
? ? ? ? // Send output to Ethernet client
? ? ? ? client.print(checksum < 0x10 ? "0" : "");
? ? ? ? client.print(checksum, HEX);
? ? ? }
?
? ? ? // Send output to Serial connection
? ? ? Serial.write(0x0D);
? ? ? Serial.write(0x0A);
? ? ? Serial.write('>');
?
? ? ? if (isEthernetConnected && client.connected()) {
? ? ? ? // Send output to Ethernet client
? ? ? ? client.write(0x0D); // CR
? ? ? ? client.write(0x0A); // LF
? ? ? ? client.write('>');? // ETX replaced by '>'
? ? ? }
?
? ? ? readers[i].mfrc522.PICC_HaltA();
? ? ? readers[i].mfrc522.PCD_StopCrypto1();
? ? }
? }
}
Tom
Ken Heywood
Ken Cameron