I am creating a project that will read the RFID card or tag data, store that into a mysql database and display the data via PHP.
I am using NodeMCU, RC522 RFID reader and Ardunio IDE to do that.
Below is my Arduino code. It successfully connects with WiFi (that I can see via serial monitor) but gives no response when I touch the RFID card to the reader.
I can't find the error.
/*
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# RFID MFRC522 / RC522 Library : https://github.com/miguelbalboa/rfid #
# #
# Installation : #
# NodeMCU ESP8266/ESP12E RFID MFRC522 / RC522 #
# D2 <----------> SDA/SS #
# D5 <----------> SCK #
# D7 <----------> MOSI #
# D6 <----------> MISO #
# GND <----------> GND #
# D1 <----------> RST #
# 3V/3V3 <----------> 3.3V #
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
#include <ESP8266WebServer.h>
#include <ESP8266HTTPClient.h>
#include <SPI.h>
#include <MFRC522.h>
#define SS_PIN D2 //--> SDA / SS is connected to pinout D2
#define RST_PIN D1 //--> RST is connected to pinout D1
MFRC522 mfrc522(SS_PIN, RST_PIN); //--> Create MFRC522 instance.
#define ON_Board_LED 2 //--> Defining an On Board LED, used for indicators when the process of connecting to a wifi router
//----------------------------------------SSID and Password of your WiFi router-------------------------------------------------------------------------------------------------------------//
const char* ssid = "apiece solution";
const char* password = "apiece@123";
//------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------//
ESP8266WebServer server(80); //--> Server on port 80
int readsuccess;
byte readcard[4];
char str[32] = "";
String StrUID;
//-----------------------------------------------------------------------------------------------SETUP--------------------------------------------------------------------------------------//
void setup() {
Serial.begin(115200); //--> Initialize serial communications with the PC
SPI.begin(); //--> Init SPI bus
mfrc522.PCD_Init(); //--> Init MFRC522 card
delay(500);
WiFi.begin(ssid, password); //--> Connect to your WiFi router
Serial.println("hello");
pinMode(ON_Board_LED,OUTPUT);
digitalWrite(ON_Board_LED, HIGH); //--> Turn off Led On Board
//----------------------------------------Wait for connection
Serial.print("Connecting");
while (WiFi.status() != WL_CONNECTED) {
Serial.print(".");
//----------------------------------------Make the On Board Flashing LED on the process of connecting to the wifi router.
digitalWrite(ON_Board_LED, LOW);
delay(250);
digitalWrite(ON_Board_LED, HIGH);
delay(250);
}
digitalWrite(ON_Board_LED, HIGH); //--> Turn off the On Board LED when it is connected to the wifi router.
//----------------------------------------If successfully connected to the wifi router, the IP Address that will be visited is displayed in the serial monitor
Serial.println("");
Serial.print("Successfully connected to : ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
Serial.println("Please tag a card or keychain to see the UID !");
Serial.println("");
}
//------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------//
//-----------------------------------------------------------------------------------------------LOOP---------------------------------------------------------------------------------------//
void loop() {
// put your main code here, to run repeatedly
readsuccess = getid();
if(readsuccess) {
digitalWrite(ON_Board_LED, LOW);
HTTPClient http; //Declare object of class HTTPClient
String UIDresultSend, postData;
UIDresultSend = StrUID;
//Post Data
postData = "UIDresult=" + UIDresultSend;
// http.begin("http://192.168.1.6/NodeMCU_RC522_Mysql/getUID.php"); //Specify request destination
//http.addHeader("Content-Type", "application/x-www-form-urlencoded"); //Specify content-type header
int httpCode = http.POST(postData); //Send the request
String payload = http.getString(); //Get the response payload
Serial.println(UIDresultSend);
Serial.println(httpCode); //Print HTTP return code
Serial.println(payload); //Print request response payload
http.end(); //Close connection
delay(1000);
digitalWrite(ON_Board_LED, HIGH);
}
else
{
Serial.println("hi");
delay(1000);
}
}
//------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------//
//----------------------------------------Procedure for reading and obtaining a UID from a card or keychain---------------------------------------------------------------------------------//
int getid() {
if(!mfrc522.PICC_IsNewCardPresent()) {
return 0;
}
if(!mfrc522.PICC_ReadCardSerial()) {
return 0;
}
Serial.print("THE UID OF THE SCANNED CARD IS : ");
for(int i=0;i<4;i++){
readcard[i]=mfrc522.uid.uidByte[i]; //storing the UID of the tag in readcard
array_to_string(readcard, 4, str);
StrUID = str;
}
mfrc522.PICC_HaltA();
return 1;
}
//------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------//
//----------------------------------------Procedure to change the result of reading an array UID into a string------------------------------------------------------------------------------//
void array_to_string(byte array[], unsigned int len, char buffer[]) {
for (unsigned int i = 0; i < len; i++)
{
byte nib1 = (array[i] >> 4) & 0x0F;
byte nib2 = (array[i] >> 0) & 0x0F;
buffer[i*2+0] = nib1 < 0xA ? '0' + nib1 : 'A' + nib1 - 0xA;
buffer[i*2+1] = nib2 < 0xA ? '0' + nib2 : 'A' + nib2 - 0xA;
}
buffer[len*2] = '\0';
}
//------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------//
