Sending Data from ESP8266 to PHP

Question 1

I want to display the RFID tag value to a html file.

I am using ESP8266 ESP-01 module, EM-18 Reader Module, Arduino Uno and Xampp for hosting PHP.

Right now, I am getting a value of "255" in Arduino whenever I scan a RFID tag. But I am supposed to get the 12-digit alphanumeric RFID tag value.

I have attached the Arduino and also the output screen of the Serial Monitor.

I have my college submission next week so it's urgent. Any help would be appreciated.

#include "SoftwareSerial.h"String ssid ="Home";String password="****";SoftwareSerial esp(2, 3);// RX, TXString data;String server = "192.168.0.182"; // www.example.comString uri = "/testget.php";// our example is /esppost.phpint DHpin = 0;//sensor pinbyte dat [12];String tag;void setup() {  pinMode (DHpin, OUTPUT);  esp.begin(9600);  Serial.begin(9600);  reset();  connectWifi();}//reset the esp8266 modulevoid reset() {  esp.println("AT+RST");  delay(1000);  if(esp.find("OK") )     Serial.println("Module Reset");}//connect to your wifi networkvoid connectWifi() {  String cmd = "AT+CWJAP=\"" +ssid+"\",\"" + password + "\"";  esp.println(cmd);  delay(4000);  /*  if(esp.find("OK")) {    Serial.println("Connected!");  }  else {    connectWifi();    Serial.println("Cannot connect to wifi"); }*/} byte read_data () {  byte data;  for (int i = 0; i < 13; i ++) {    if (digitalRead (DHpin) == LOW) {      while (digitalRead (DHpin) == LOW); // wait for 50us        delayMicroseconds (30); // determine the duration of the high level to determine the data is '0 'or '1'      if (digitalRead (DHpin) == HIGH)        data |= (1 << (12-i)); // high front and low in the post      while (digitalRead (DHpin) == HIGH);// data '1 ', wait for the next one receiver    }  }   return data; }void start_test () {  digitalWrite (DHpin, LOW); // bus down, send start signal  delay (30); // delay greater than 18ms, so DHT11 start signal can be detected  digitalWrite (DHpin, HIGH);  delayMicroseconds (40); // Wait for DHT11 response  pinMode (DHpin, INPUT);  while (digitalRead (DHpin) == HIGH);    delayMicroseconds (80);  // DHT11 response, pulled the bus 80us  if (digitalRead (DHpin) == LOW);    delayMicroseconds (80);  // DHT11 80us after the bus pulled to start sending data  for (int i = 0; i < 13; i ++)    // receive tag value data, the parity bit is not considered    dat[i] = read_data ();  pinMode (DHpin, OUTPUT);  digitalWrite (DHpin, HIGH);  // send data once after releasing the bus, wait for the host to open the next Start signal}void loop () {  start_test ();  // convert the bit data to string form  tag= String(dat[12]);  data = "tag=" + tag;// data sent must be under this form //name1=value1&name2=value2.  Serial.println(data);  httppost();  delay(1000);}void httppost () {  esp.println("AT+CIPSTART=\"TCP\",\"" + server + "\",80");//start a TCP connection.  if( esp.find("OK")) {    Serial.println("TCP connection ready");  }   delay(1000);  String postRequest =  "POST " + uri + " HTTP/1.0\r\n" +  "Host: " + server + "\r\n" +  "Accept: *" + "/" + "*\r\n" +  "Content-Length: " + data.length() + "\r\n" +  "Content-Type: application/x-www-form-urlencoded\r\n" +  "\r\n" + data;  String sendCmd = "AT+CIPSEND=";//determine the number of caracters to be sent.  esp.print(sendCmd);  esp.println(postRequest.length() );  delay(500);  if(esp.find(">")) {     Serial.println("Sending..");     esp.print(postRequest);    if( esp.find("SEND OK")) {       Serial.println("Packet sent");      while (esp.available()) {        String tmpResp = esp.readString();        Serial.println(tmpResp);      }      // close the connection    esp.println("AT+CIPCLOSE");    }  }}

Output :

Question 2

tag= String(dat[12]); doesn't do what you think it does. Also you are trying to read 13 bytes into an array of 12 bytes and cram 13 bits into a byte. And for some reason using pin 0 for the sensor while still using serial.

Question 3

Please can you help me with the code? I am new to Arduino and I'm really struggling with my grades on the line!

Question 4

change<13 to<12 and properly convert the byte(/char)array to a String

Question 5

I did that and I'm getting 254 now. I wrote this: String myString = String(myByteArray); to convert.

Question 6

Your example code doesn't havemyByteArray, so saying you tried that doesn't help anyone understand the context in which you tried it. You can edit your question to include updated code you have tried, etc.

Question 7

I got it working using the code below:

#include "SoftwareSerial.h"String ssid ="Home";String password="%Qwerty@123%";char input[12];        int count = 0;  SoftwareSerial esp(2, 3);// RX, TXString data;String server = "192.168.0.182"; // www.example.comString uri = "/testget.php";// our example is /esppost.phpint DHpin = 0;//sensor pinbyte dat [12];String temp;void setup() {pinMode (DHpin, OUTPUT);esp.begin(9600);Serial.begin(9600);reset();connectWifi();}//reset the esp8266 modulevoid reset() {esp.println("AT+RST");delay(1000);if(esp.find("OK") ) Serial.println("Module Reset");}//connect to your wifi networkvoid connectWifi() {String cmd = "AT+CWJAP=\"" +ssid+"\",\"" + password + "\"";esp.println(cmd);delay(4000);}byte read_data () {byte data;for (int i = 0; i < 8; i ++) {if (digitalRead (DHpin) == LOW) {while (digitalRead (DHpin) == LOW); // wait for 50usdelayMicroseconds (30); // determine the duration of the high level to determine the data is '0 'or '1'if (digitalRead (DHpin) == HIGH){data |= (1 << (7-i)); // high front and low in the post }while (digitalRead (DHpin) == HIGH);// data '1 ', wait for the next one receiver}} return data; }void start_test () {digitalWrite (DHpin, LOW); // bus down, send start signaldelay (30); // delay greater than 18ms, so DHT11 start signal can be detecteddigitalWrite (DHpin, HIGH);delayMicroseconds (40); // Wait for DHT11 responsepinMode (DHpin, INPUT);while (digitalRead (DHpin) == HIGH);delayMicroseconds (80);// DHT11 response, pulled the bus 80usif (digitalRead (DHpin) == LOW);delayMicroseconds (80);while(count<12){input[count] = Serial.read(); // Read 1 Byte of data and store it in the input[] variable      count++;          // increment counter      delay(5);}// DHT11 80us after the bus pulled to start sending data//for (int i = 0; i < 4; i ++)// receive temperature and humidity data, the parity bit is not considered/*for(int x=0;x<12;x++)for(int i=0;i<12;i++)//dat[i] = read_data ();dat[x]=input[i];*/pinMode (DHpin, OUTPUT);digitalWrite (DHpin, HIGH);// send data once after releasing the bus, wait for the host to open the next Start signal}void loop () {start_test ();    count = 0;      // Reset the counter to zero    temp = "";    // convert the bit data to string formfor(int i=0;i<13;i++)temp += input[i];Serial.println(temp);//Serial.println(temp);data = "tag=" + temp;// data sent must be under this form //name1=value1&name2=value2.httppost();delay(200);}void httppost () {esp.println("AT+CIPSTART=\"TCP\",\"" + server + "\",80");//start a TCP connection.if( esp.find("OK")) {Serial.println("TCP connection ready");} delay(100);String postRequest ="POST " + uri + " HTTP/1.0\r\n" +"Host: " + server + "\r\n" +"Accept: *" + "/" + "*\r\n" +"Content-Length: " + data.length() + "\r\n" +"Content-Type: application/x-www-form-urlencoded\r\n" +"\r\n" + data;String sendCmd = "AT+CIPSEND=";//determine the number of caracters to be sent.esp.print(sendCmd);esp.println(postRequest.length() );delay(500);if(esp.find(">")) { Serial.println("Sending.."); esp.print(postRequest);if( esp.find("SEND OK")) { Serial.println("Packet sent");//while (esp.available()) {//String tmpResp = esp.readString();//Serial.println(tmpResp);//}// close the connectionesp.println("AT+CIPCLOSE");}}}

Question 8

You can follow this awesome tutorial if you want to connect your RFID RC522 module to PHP. Source Code and a step by step tutorial are provided. You only need NodeMcu and RC522 RFID module.https://devcraze.com/tutorials/connecting-rfid-scanner-to-php-using-nodemcu-wifi-module/

curiously77 1111 silver badge4 bronze badges · Answer 1 · 2018-04-13 19:56:05Z

I got it working using the code below:

#include "SoftwareSerial.h"String ssid ="Home";String password="%Qwerty@123%";char input[12];        int count = 0;  SoftwareSerial esp(2, 3);// RX, TXString data;String server = "192.168.0.182"; // www.example.comString uri = "/testget.php";// our example is /esppost.phpint DHpin = 0;//sensor pinbyte dat [12];String temp;void setup() {pinMode (DHpin, OUTPUT);esp.begin(9600);Serial.begin(9600);reset();connectWifi();}//reset the esp8266 modulevoid reset() {esp.println("AT+RST");delay(1000);if(esp.find("OK") ) Serial.println("Module Reset");}//connect to your wifi networkvoid connectWifi() {String cmd = "AT+CWJAP=\"" +ssid+"\",\"" + password + "\"";esp.println(cmd);delay(4000);}byte read_data () {byte data;for (int i = 0; i < 8; i ++) {if (digitalRead (DHpin) == LOW) {while (digitalRead (DHpin) == LOW); // wait for 50usdelayMicroseconds (30); // determine the duration of the high level to determine the data is '0 'or '1'if (digitalRead (DHpin) == HIGH){data |= (1 << (7-i)); // high front and low in the post }while (digitalRead (DHpin) == HIGH);// data '1 ', wait for the next one receiver}} return data; }void start_test () {digitalWrite (DHpin, LOW); // bus down, send start signaldelay (30); // delay greater than 18ms, so DHT11 start signal can be detecteddigitalWrite (DHpin, HIGH);delayMicroseconds (40); // Wait for DHT11 responsepinMode (DHpin, INPUT);while (digitalRead (DHpin) == HIGH);delayMicroseconds (80);// DHT11 response, pulled the bus 80usif (digitalRead (DHpin) == LOW);delayMicroseconds (80);while(count<12){input[count] = Serial.read(); // Read 1 Byte of data and store it in the input[] variable      count++;          // increment counter      delay(5);}// DHT11 80us after the bus pulled to start sending data//for (int i = 0; i < 4; i ++)// receive temperature and humidity data, the parity bit is not considered/*for(int x=0;x<12;x++)for(int i=0;i<12;i++)//dat[i] = read_data ();dat[x]=input[i];*/pinMode (DHpin, OUTPUT);digitalWrite (DHpin, HIGH);// send data once after releasing the bus, wait for the host to open the next Start signal}void loop () {start_test ();    count = 0;      // Reset the counter to zero    temp = "";    // convert the bit data to string formfor(int i=0;i<13;i++)temp += input[i];Serial.println(temp);//Serial.println(temp);data = "tag=" + temp;// data sent must be under this form //name1=value1&name2=value2.httppost();delay(200);}void httppost () {esp.println("AT+CIPSTART=\"TCP\",\"" + server + "\",80");//start a TCP connection.if( esp.find("OK")) {Serial.println("TCP connection ready");} delay(100);String postRequest ="POST " + uri + " HTTP/1.0\r\n" +"Host: " + server + "\r\n" +"Accept: *" + "/" + "*\r\n" +"Content-Length: " + data.length() + "\r\n" +"Content-Type: application/x-www-form-urlencoded\r\n" +"\r\n" + data;String sendCmd = "AT+CIPSEND=";//determine the number of caracters to be sent.esp.print(sendCmd);esp.println(postRequest.length() );delay(500);if(esp.find(">")) { Serial.println("Sending.."); esp.print(postRequest);if( esp.find("SEND OK")) { Serial.println("Packet sent");//while (esp.available()) {//String tmpResp = esp.readString();//Serial.println(tmpResp);//}// close the connectionesp.println("AT+CIPCLOSE");}}}

Cedric Don Coloma 1 · Answer 2 · 2019-01-29 13:53:15Z

You can follow this awesome tutorial if you want to connect your RFID RC522 module to PHP. Source Code and a step by step tutorial are provided. You only need NodeMcu and RC522 RFID module.https://devcraze.com/tutorials/connecting-rfid-scanner-to-php-using-nodemcu-wifi-module/

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