ESP01 Webserver to Control Your Arduino UNO, Mega or Nano

Using WiFi to control your Arduino UNO, Nano or Mega as a basis. Includes feedback and simple hardware.

Jan 10, 2019

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9 respects

wifi

communication

remote control

Components and supplies

ESP8266 ESP-01

Stripboard

Arduino Mega 2560

Arduino Leonardo

Arduino Due

Resistor 1k ohm

Arduino Nano R3

Ardunio Header strips

Arduino UNO

LED (generic)

Wire Cable - By the Foot

Tools and machines

Soldering iron (generic)

Pliers

Reel of Solder

Apps and platforms

Arduino IDE

TCPIP Client

Realterm for PC

TCP Console for Apple Ipad and Iphone

Project description

Code

ESP-01 and UNO Webserver Remote Control

arduino

Control your Arduino board via WiFi and get a feedback

1[code]
2// You may use on board LED connected to pin 13
3// Elminated   delays and serial monitor commands, reduced response time to 5 seconds.
4#include   <SoftwareSerial.h>
5
6int serialRx = 2;   // software serial  RX  TX 
7int   serialTx = 3;   // ESP-01 RX goes to this port, TX goes to Port 2
8int d = 0;
9//   ESP-01 CH_PD pin 7 Must go to 3.3v, not +5v to enable operation as UART (AP)
10//   UNO R3 has enough power to make it work.
11// No other connections required
12String   inMsg ;     // variable to collect strings
13int sensorPin = 8;    // set maximum   number of pins for the Analouge inputs
14int LEDPin = 13 ;  // variable to assign   pin to LED.
15int responseTime = 10; //communication timeout
16SoftwareSerial   portOne(serialRx, serialTx); // communications port to ESP-01
17 String Msg = "";   // to collect Analouge input data 
18void setup() {
19
20// Serial.begin(19200);   // for debugging only
21
22String  msg =""  ; 
23  portOne.begin(115200);                //   Start software serial port
24  delay(200);
25
26  sendToWifi("ATE0",100);                           //   set Echo Off. Otherwise echo was ON.
27  sendToWifi("AT+CWMODE=2",responseTime);   // configure as access point on Chinese version
28  // sendToWifi("AT+CWMODE_CUR   = 2",responseTime); // configure as access point (AP)
29  sendToWifi("AT+CIPMUX=1",responseTime);   // configure for multiple connections
30  // AT+CIPAP=<ip>[,<gateway>,<netmask>]
31   sendToWifi("AT+CIPAP_CUR=\\"192.168.5.1\\"",responseTime); // Set IP address   for AP
32  sendToWifi("AT+CIPSERVER=1,80",responseTime); // Create and turn on   server on port 80
33  sendToWifi("AT+CWDHCP_CUR=0,1",responseTime); // Set AP   with DHCP ON (required)
34  //AT+CWSAP=<ssid>,<pwd>,<chl>,<ecn>[,<max conn>][,<ssid   hidden>]
35  // Open AP Port
36  sendToWifi("AT+CWSAP=\\"ESP8266\\",\\"1234567890\\",5,3,1,0",responseTime);   // Set Soft AP parameters problems sending " characters
37  sendToWifi("AT+CIPAP_CUR?",responseTime);
38   sendToWifi("AT+CIPSTO=600",responseTime); // Set timeout to 10 minutes
39  pinMode(LEDPin,OUTPUT);   // Open Port to operate LED on board
40//   //serial.println("Setup is done!");
41   // delay(2000);
42}
43
44void loop() {
45   //Serial.println("Waiting....");
46   if(portOne.available()>0){
47    inMsg = readFromWifi();
48    //serial.print("Received   msg inside loop = ");
49    inMsg.toUpperCase();
50   // Serial.println(inMsg);
51     // Messages in CAPITALS
52    if (inMsg.endsWith("HELLO") ) {
53    // Serial.println   ("Wifi says : Hello");
54        sendData("Wifi says : Hello\
");    // Send   confirmation of Command + CR
55        Send_inputs();
56  }
57    else if (inMsg.endsWith("LEDON")   ){
58          digitalWrite(LEDPin,HIGH);       // If just LEDON turn on Pin 13
59           sendData("Wifi says : LEDON\
");        // Send confirmation of Command   + CR
60          Send_inputs(); // Send Analouge inputs
61    }
62   else if   (inMsg.endsWith("LEDOFF") ){  
63       String     msg = SETLEDS(0) ; // set   all LEDs off.
64        sendData("Wifi says : LEDOFF\
");   // Send confirmation   of Command + CR  
65        Send_inputs(); // Send Analouge inputs     
66    }    
67    else if (inMsg.indexOf("LEDONN",0)>6 ){  // if Command is to set a   Number
68         d = inMsg.indexOf("LEDONN",0)+6; // Set d to next letter after   command // string starts with zero
69     int a = 0; // zero collected number
70      int dt = inMsg.length(); // find end of string (CR)
71    if ( d+3 < dt){               // if there is a 4 digit number after command
72            a = inMsg.substring(d,   d+4).toInt(); // store 4 digits in number a
73      String    msg ="ERROR";
74             if ((a > 0) & (a < 1024) ) {  // Command not used for zero (use LEDOFF),   avoids no number available
75             msg = SETLEDS(a) ; // set all LEDs on   or off, returns Binary string as confirmation
76             }
77             msg   = "Wifi says : LEDONN="+msg+"\
";
78            sendData(msg ); // Send confirmation   of Command + CR
79             Send_inputs();  // Send Analouge inputs
80             }
81    }
82   // delay(9000);                              // deliberately large delay   to help collect dump of serial port.
83}
84     inMsg="";  // Clear buffer
85     delay(800); // delay to stop duplicate messages
86}
87void sendToWifi(String   command, const int timeout){
88// only send command, not intereted in response
89   String response = "";
90  // Serial.print("Sent command to ESP8266-E12: ");
91    // Serial.print(command);
92  delay(50);
93  portOne.println(command); 
94   long int time = millis();
95  while( (time+timeout) > millis())
96  {
97    while(portOne.available())
98     { 
99      char c = portOne.read(); 
100      response+=c;
101    }  
102  }
103
104    // Serial.print("Response from ESP8266-E12: ");
105   // Serial.print(response);
106}
107
108String   readFromWifi(){
109  char arrayInMsg[100];
110  String tempStr; 
111  int count   =0;
112  while( portOne.available() > 0 ){
113  
114    arrayInMsg[count]= portOne.read();
115     delay(80);
116    // get out if you see CR or LF
117    if ((arrayInMsg[count]=='\
118')   or (arrayInMsg[count]=='\
')) break; 
119    // changed character array comparison   or it causes errors
120    count++;       
121  }
122  arrayInMsg[count] = '\\0';                      // Null terminate finally
123  tempStr = String (arrayInMsg);                 // cast it to string
124  tempStr.trim();                               //   precaution
125  // Serial.print(tempStr);
126  return tempStr;
127}
128/*
129* Name:   sendData
130* Description: Function used to send string to tcp client using cipsend
131*   Params: 
132* Returns: void
133*/
134 void sendData(String str){
135  String len="";
136   len+=str.length();
137  sendToWifi("AT+CIPSEND=0,"+len,responseTime); // Setup   command to send str data length to channel 0
138  delay(100);
139  sendToWifi(str,responseTime);//Send   String str with 0 closing the transmission and return to AT mode
140   delay(100);
141   do {
142  delay(100);
143  } while (portOne.available()==0); // wait untill response   data "sent" or "failed"
144}
145
146String  SETLEDS(int long pulse) {
147  pulse=   pulse << 4; // move numbers up to pin 4
148 String response2 = "" ;
149    for   ( int x = 13; x >3 ; x--)  { // Pins 13 down to 4
150    if (pulse & (1 << x)) {   // compare pulse with bit number of Digital output port
151     digitalWrite(x,HIGH);
152      response2 = response2 + "1";
153     // Serial.print("1"); // just for   testing
154    }
155    else {
156     digitalWrite(x,LOW);
157     response2 =   response2 + "0";
158    // Serial.print("0"); // just for testing
159     }
160      }
161    // Serial.println(""); // just for testing
162     return response2;   // Return Binary string
163  }
164// Send Analouge data
165void Send_inputs(){
166   delay (1000);
167  Msg = Sensor_Read(); // replace Msg with Analouge input string
168         Msg = "Analoue Reads 0-7:"+ Msg + "\
";
169        sendData(Msg);    //   Send Analouge inputs + CR
170}
171  // Read all analouge inputs routine
172String   Sensor_Read(){
173  String response3 = "" ;
174  for (int y = 0; y < sensorPin;   y++) { // read ALL analouge inputs
175  String an = "A" + String(y,DEC);      //   format for Pin numbers
176 int f = an.toInt(); // turn string into a Analouge Input   pin number
177 response3 = response3 + String(analogRead(f),DEC); // add value to   string
178 if (y < sensorPin-1){
179 response3 = response3 +",";    // add a comma   if not last number
180 }
181 }
182  return response3;            // return string   of numbers to loop
183}
184[/code]

[code]
// You may use on board LED connected to pin 13
// Elminated   delays and serial monitor commands, reduced response time to 5 seconds.
#include   <SoftwareSerial.h>

int serialRx = 2;   // software serial  RX  TX 
int   serialTx = 3;   // ESP-01 RX goes to this port, TX goes to Port 2
int d = 0;
//   ESP-01 CH_PD pin 7 Must go to 3.3v, not +5v to enable operation as UART (AP)
//   UNO R3 has enough power to make it work.
// No other connections required
String   inMsg ;     // variable to collect strings
int sensorPin = 8;    // set maximum   number of pins for the Analouge inputs
int LEDPin = 13 ;  // variable to assign   pin to LED.
int responseTime = 10; //communication timeout
SoftwareSerial   portOne(serialRx, serialTx); // communications port to ESP-01
 String Msg = "";   // to collect Analouge input data 
void setup() {

// Serial.begin(19200);   // for debugging only

String  msg =""  ; 
  portOne.begin(115200);                //   Start software serial port
  delay(200);

  sendToWifi("ATE0",100);                           //   set Echo Off. Otherwise echo was ON.
  sendToWifi("AT+CWMODE=2",responseTime);   // configure as access point on Chinese version
  // sendToWifi("AT+CWMODE_CUR   = 2",responseTime); // configure as access point (AP)
  sendToWifi("AT+CIPMUX=1",responseTime);   // configure for multiple connections
  // AT+CIPAP=<ip>[,<gateway>,<netmask>]
   sendToWifi("AT+CIPAP_CUR=\\"192.168.5.1\\"",responseTime); // Set IP address   for AP
  sendToWifi("AT+CIPSERVER=1,80",responseTime); // Create and turn on   server on port 80
  sendToWifi("AT+CWDHCP_CUR=0,1",responseTime); // Set AP   with DHCP ON (required)
  //AT+CWSAP=<ssid>,<pwd>,<chl>,<ecn>[,<max conn>][,<ssid   hidden>]
  // Open AP Port
  sendToWifi("AT+CWSAP=\\"ESP8266\\",\\"1234567890\\",5,3,1,0",responseTime);   // Set Soft AP parameters problems sending " characters
  sendToWifi("AT+CIPAP_CUR?",responseTime);
   sendToWifi("AT+CIPSTO=600",responseTime); // Set timeout to 10 minutes
  pinMode(LEDPin,OUTPUT);   // Open Port to operate LED on board
//   //serial.println("Setup is done!");
   // delay(2000);
}

void loop() {
   //Serial.println("Waiting....");
   if(portOne.available()>0){
    inMsg = readFromWifi();
    //serial.print("Received   msg inside loop = ");
    inMsg.toUpperCase();
   // Serial.println(inMsg);
     // Messages in CAPITALS
    if (inMsg.endsWith("HELLO") ) {
    // Serial.println   ("Wifi says : Hello");
        sendData("Wifi says : Hello\
");    // Send   confirmation of Command + CR
        Send_inputs();
  }
    else if (inMsg.endsWith("LEDON")   ){
          digitalWrite(LEDPin,HIGH);       // If just LEDON turn on Pin 13
           sendData("Wifi says : LEDON\
");        // Send confirmation of Command   + CR
          Send_inputs(); // Send Analouge inputs
    }
   else if   (inMsg.endsWith("LEDOFF") ){  
       String     msg = SETLEDS(0) ; // set   all LEDs off.
        sendData("Wifi says : LEDOFF\
");   // Send confirmation   of Command + CR  
        Send_inputs(); // Send Analouge inputs     
    }    
    else if (inMsg.indexOf("LEDONN",0)>6 ){  // if Command is to set a   Number
         d = inMsg.indexOf("LEDONN",0)+6; // Set d to next letter after   command // string starts with zero
     int a = 0; // zero collected number
      int dt = inMsg.length(); // find end of string (CR)
    if ( d+3 < dt){               // if there is a 4 digit number after command
            a = inMsg.substring(d,   d+4).toInt(); // store 4 digits in number a
      String    msg ="ERROR";
             if ((a > 0) & (a < 1024) ) {  // Command not used for zero (use LEDOFF),   avoids no number available
             msg = SETLEDS(a) ; // set all LEDs on   or off, returns Binary string as confirmation
             }
             msg   = "Wifi says : LEDONN="+msg+"\
";
            sendData(msg ); // Send confirmation   of Command + CR
             Send_inputs();  // Send Analouge inputs
             }
    }
   // delay(9000);                              // deliberately large delay   to help collect dump of serial port.
}
     inMsg="";  // Clear buffer
     delay(800); // delay to stop duplicate messages
}
void sendToWifi(String   command, const int timeout){
// only send command, not intereted in response
   String response = "";
  // Serial.print("Sent command to ESP8266-E12: ");
    // Serial.print(command);
  delay(50);
  portOne.println(command); 
   long int time = millis();
  while( (time+timeout) > millis())
  {
    while(portOne.available())
     { 
      char c = portOne.read(); 
      response+=c;
    }  
  }

    // Serial.print("Response from ESP8266-E12: ");
   // Serial.print(response);
}

String   readFromWifi(){
  char arrayInMsg[100];
  String tempStr; 
  int count   =0;
  while( portOne.available() > 0 ){
  
    arrayInMsg[count]= portOne.read();
     delay(80);
    // get out if you see CR or LF
    if ((arrayInMsg[count]=='\
')   or (arrayInMsg[count]=='\
')) break; 
    // changed character array comparison   or it causes errors
    count++;       
  }
  arrayInMsg[count] = '\\0';                      // Null terminate finally
  tempStr = String (arrayInMsg);                 // cast it to string
  tempStr.trim();                               //   precaution
  // Serial.print(tempStr);
  return tempStr;
}
/*
* Name:   sendData
* Description: Function used to send string to tcp client using cipsend
*   Params: 
* Returns: void
*/
 void sendData(String str){
  String len="";
   len+=str.length();
  sendToWifi("AT+CIPSEND=0,"+len,responseTime); // Setup   command to send str data length to channel 0
  delay(100);
  sendToWifi(str,responseTime);//Send   String str with 0 closing the transmission and return to AT mode
   delay(100);
   do {
  delay(100);
  } while (portOne.available()==0); // wait untill response   data "sent" or "failed"
}

String  SETLEDS(int long pulse) {
  pulse=   pulse << 4; // move numbers up to pin 4
 String response2 = "" ;
    for   ( int x = 13; x >3 ; x--)  { // Pins 13 down to 4
    if (pulse & (1 << x)) {   // compare pulse with bit number of Digital output port
     digitalWrite(x,HIGH);
      response2 = response2 + "1";
     // Serial.print("1"); // just for   testing
    }
    else {
     digitalWrite(x,LOW);
     response2 =   response2 + "0";
    // Serial.print("0"); // just for testing
     }
      }
    // Serial.println(""); // just for testing
     return response2;   // Return Binary string
  }
// Send Analouge data
void Send_inputs(){
   delay (1000);
  Msg = Sensor_Read(); // replace Msg with Analouge input string
         Msg = "Analoue Reads 0-7:"+ Msg + "\
";
        sendData(Msg);    //   Send Analouge inputs + CR
}
  // Read all analouge inputs routine
String   Sensor_Read(){
  String response3 = "" ;
  for (int y = 0; y < sensorPin;   y++) { // read ALL analouge inputs
  String an = "A" + String(y,DEC);      //   format for Pin numbers
 int f = an.toInt(); // turn string into a Analouge Input   pin number
 response3 = response3 + String(analogRead(f),DEC); // add value to   string
 if (y < sensorPin-1){
 response3 = response3 +",";    // add a comma   if not last number
 }
 }
  return response3;            // return string   of numbers to loop
}
[/code]

ESP-01 and UNO Webserver Remote Control

arduino

Control your Arduino board via WiFi and get a feedback

1[code]
2// You may use on board LED connected to pin 13
3// Elminated  delays and serial monitor commands, reduced response time to 5 seconds.
4#include  <SoftwareSerial.h>
5
6int serialRx = 2;   // software serial  RX  TX 
7int  serialTx = 3;   // ESP-01 RX goes to this port, TX goes to Port 2
8int d = 0;
9//  ESP-01 CH_PD pin 7 Must go to 3.3v, not +5v to enable operation as UART (AP)
10//  UNO R3 has enough power to make it work.
11// No other connections required
12String  inMsg ;     // variable to collect strings
13int sensorPin = 8;    // set maximum  number of pins for the Analouge inputs
14int LEDPin = 13 ;  // variable to assign  pin to LED.
15int responseTime = 10; //communication timeout
16SoftwareSerial  portOne(serialRx, serialTx); // communications port to ESP-01
17 String Msg = "";  // to collect Analouge input data 
18void setup() {
19
20// Serial.begin(19200);  // for debugging only
21
22String  msg =""  ; 
23  portOne.begin(115200);                //  Start software serial port
24  delay(200);
25
26  sendToWifi("ATE0",100);                           //  set Echo Off. Otherwise echo was ON.
27  sendToWifi("AT+CWMODE=2",responseTime);  // configure as access point on Chinese version
28  // sendToWifi("AT+CWMODE_CUR  = 2",responseTime); // configure as access point (AP)
29  sendToWifi("AT+CIPMUX=1",responseTime);  // configure for multiple connections
30  // AT+CIPAP=<ip>[,<gateway>,<netmask>]
31  sendToWifi("AT+CIPAP_CUR=\\"192.168.5.1\\"",responseTime); // Set IP address  for AP
32  sendToWifi("AT+CIPSERVER=1,80",responseTime); // Create and turn on  server on port 80
33  sendToWifi("AT+CWDHCP_CUR=0,1",responseTime); // Set AP  with DHCP ON (required)
34  //AT+CWSAP=<ssid>,<pwd>,<chl>,<ecn>[,<max conn>][,<ssid  hidden>]
35  // Open AP Port
36  sendToWifi("AT+CWSAP=\\"ESP8266\\",\\"1234567890\\",5,3,1,0",responseTime);  // Set Soft AP parameters problems sending " characters
37  sendToWifi("AT+CIPAP_CUR?",responseTime);
38  sendToWifi("AT+CIPSTO=600",responseTime); // Set timeout to 10 minutes
39  pinMode(LEDPin,OUTPUT);  // Open Port to operate LED on board
40//   //serial.println("Setup is done!");
41  // delay(2000);
42}
43
44void loop() {
45   //Serial.println("Waiting....");
46  if(portOne.available()>0){
47    inMsg = readFromWifi();
48    //serial.print("Received  msg inside loop = ");
49    inMsg.toUpperCase();
50   // Serial.println(inMsg);
51    // Messages in CAPITALS
52    if (inMsg.endsWith("HELLO") ) {
53    // Serial.println  ("Wifi says : Hello");
54        sendData("Wifi says : Hello\
");    // Send  confirmation of Command + CR
55        Send_inputs();
56  }
57    else if (inMsg.endsWith("LEDON")  ){
58          digitalWrite(LEDPin,HIGH);       // If just LEDON turn on Pin 13
59          sendData("Wifi says : LEDON\
");        // Send confirmation of Command  + CR
60          Send_inputs(); // Send Analouge inputs
61    }
62   else if  (inMsg.endsWith("LEDOFF") ){  
63       String     msg = SETLEDS(0) ; // set  all LEDs off.
64        sendData("Wifi says : LEDOFF\
");   // Send confirmation  of Command + CR  
65        Send_inputs(); // Send Analouge inputs     
66    }   
67    else if (inMsg.indexOf("LEDONN",0)>6 ){  // if Command is to set a  Number
68         d = inMsg.indexOf("LEDONN",0)+6; // Set d to next letter after  command // string starts with zero
69     int a = 0; // zero collected number
70     int dt = inMsg.length(); // find end of string (CR)
71    if ( d+3 < dt){              // if there is a 4 digit number after command
72            a = inMsg.substring(d,  d+4).toInt(); // store 4 digits in number a
73      String    msg ="ERROR";
74            if ((a > 0) & (a < 1024) ) {  // Command not used for zero (use LEDOFF),  avoids no number available
75             msg = SETLEDS(a) ; // set all LEDs on  or off, returns Binary string as confirmation
76             }
77             msg  = "Wifi says : LEDONN="+msg+"\
";
78            sendData(msg ); // Send confirmation  of Command + CR
79             Send_inputs();  // Send Analouge inputs
80             }
81   }
82   // delay(9000);                              // deliberately large delay  to help collect dump of serial port.
83}
84     inMsg="";  // Clear buffer
85    delay(800); // delay to stop duplicate messages
86}
87void sendToWifi(String  command, const int timeout){
88// only send command, not intereted in response
89  String response = "";
90  // Serial.print("Sent command to ESP8266-E12: ");
91   // Serial.print(command);
92  delay(50);
93  portOne.println(command); 
94  long int time = millis();
95  while( (time+timeout) > millis())
96  {
97    while(portOne.available())
98    { 
99      char c = portOne.read(); 
100      response+=c;
101    }  
102  }
103
104   // Serial.print("Response from ESP8266-E12: ");
105   // Serial.print(response);
106}
107
108String  readFromWifi(){
109  char arrayInMsg[100];
110  String tempStr; 
111  int count  =0;
112  while( portOne.available() > 0 ){
113  
114    arrayInMsg[count]= portOne.read();
115    delay(80);
116    // get out if you see CR or LF
117    if ((arrayInMsg[count]=='\n')  or (arrayInMsg[count]=='\r')) break; 
118    // changed character array comparison  or it causes errors
119    count++;       
120  }
121  arrayInMsg[count] = '\\0';                     // Null terminate finally
122  tempStr = String (arrayInMsg);                // cast it to string
123  tempStr.trim();                               //  precaution
124  // Serial.print(tempStr);
125  return tempStr;
126}
127/*
128* Name:  sendData
129* Description: Function used to send string to tcp client using cipsend
130*  Params: 
131* Returns: void
132*/
133 void sendData(String str){
134  String len="";
135  len+=str.length();
136  sendToWifi("AT+CIPSEND=0,"+len,responseTime); // Setup  command to send str data length to channel 0
137  delay(100);
138  sendToWifi(str,responseTime);//Send  String str with 0 closing the transmission and return to AT mode
139   delay(100);
140  do {
141  delay(100);
142  } while (portOne.available()==0); // wait untill response  data "sent" or "failed"
143}
144
145String  SETLEDS(int long pulse) {
146  pulse=  pulse << 4; // move numbers up to pin 4
147 String response2 = "" ;
148    for  ( int x = 13; x >3 ; x--)  { // Pins 13 down to 4
149    if (pulse & (1 << x)) {  // compare pulse with bit number of Digital output port
150     digitalWrite(x,HIGH);
151     response2 = response2 + "1";
152     // Serial.print("1"); // just for  testing
153    }
154    else {
155     digitalWrite(x,LOW);
156     response2 =  response2 + "0";
157    // Serial.print("0"); // just for testing
158     }
159     }
160    // Serial.println(""); // just for testing
161     return response2;  // Return Binary string
162  }
163// Send Analouge data
164void Send_inputs(){
165  delay (1000);
166  Msg = Sensor_Read(); // replace Msg with Analouge input string
167        Msg = "Analoue Reads 0-7:"+ Msg + "\
";
168        sendData(Msg);    //  Send Analouge inputs + CR
169}
170  // Read all analouge inputs routine
171String  Sensor_Read(){
172  String response3 = "" ;
173  for (int y = 0; y < sensorPin;  y++) { // read ALL analouge inputs
174  String an = "A" + String(y,DEC);      //  format for Pin numbers
175 int f = an.toInt(); // turn string into a Analouge Input  pin number
176 response3 = response3 + String(analogRead(f),DEC); // add value to  string
177 if (y < sensorPin-1){
178 response3 = response3 +",";    // add a comma  if not last number
179 }
180 }
181  return response3;            // return string  of numbers to loop
182}
183[/code]

[code]
// You may use on board LED connected to pin 13
// Elminated  delays and serial monitor commands, reduced response time to 5 seconds.
#include  <SoftwareSerial.h>

int serialRx = 2;   // software serial  RX  TX 
int  serialTx = 3;   // ESP-01 RX goes to this port, TX goes to Port 2
int d = 0;
//  ESP-01 CH_PD pin 7 Must go to 3.3v, not +5v to enable operation as UART (AP)
//  UNO R3 has enough power to make it work.
// No other connections required
String  inMsg ;     // variable to collect strings
int sensorPin = 8;    // set maximum  number of pins for the Analouge inputs
int LEDPin = 13 ;  // variable to assign  pin to LED.
int responseTime = 10; //communication timeout
SoftwareSerial  portOne(serialRx, serialTx); // communications port to ESP-01
 String Msg = "";  // to collect Analouge input data 
void setup() {

// Serial.begin(19200);  // for debugging only

String  msg =""  ; 
  portOne.begin(115200);                //  Start software serial port
  delay(200);

  sendToWifi("ATE0",100);                           //  set Echo Off. Otherwise echo was ON.
  sendToWifi("AT+CWMODE=2",responseTime);  // configure as access point on Chinese version
  // sendToWifi("AT+CWMODE_CUR  = 2",responseTime); // configure as access point (AP)
  sendToWifi("AT+CIPMUX=1",responseTime);  // configure for multiple connections
  // AT+CIPAP=<ip>[,<gateway>,<netmask>]
  sendToWifi("AT+CIPAP_CUR=\\"192.168.5.1\\"",responseTime); // Set IP address  for AP
  sendToWifi("AT+CIPSERVER=1,80",responseTime); // Create and turn on  server on port 80
  sendToWifi("AT+CWDHCP_CUR=0,1",responseTime); // Set AP  with DHCP ON (required)
  //AT+CWSAP=<ssid>,<pwd>,<chl>,<ecn>[,<max conn>][,<ssid  hidden>]
  // Open AP Port
  sendToWifi("AT+CWSAP=\\"ESP8266\\",\\"1234567890\\",5,3,1,0",responseTime);  // Set Soft AP parameters problems sending " characters
  sendToWifi("AT+CIPAP_CUR?",responseTime);
  sendToWifi("AT+CIPSTO=600",responseTime); // Set timeout to 10 minutes
  pinMode(LEDPin,OUTPUT);  // Open Port to operate LED on board
//   //serial.println("Setup is done!");
  // delay(2000);
}

void loop() {
   //Serial.println("Waiting....");
  if(portOne.available()>0){
    inMsg = readFromWifi();
    //serial.print("Received  msg inside loop = ");
    inMsg.toUpperCase();
   // Serial.println(inMsg);
    // Messages in CAPITALS
    if (inMsg.endsWith("HELLO") ) {
    // Serial.println  ("Wifi says : Hello");
        sendData("Wifi says : Hello\
");    // Send  confirmation of Command + CR
        Send_inputs();
  }
    else if (inMsg.endsWith("LEDON")  ){
          digitalWrite(LEDPin,HIGH);       // If just LEDON turn on Pin 13
          sendData("Wifi says : LEDON\
");        // Send confirmation of Command  + CR
          Send_inputs(); // Send Analouge inputs
    }
   else if  (inMsg.endsWith("LEDOFF") ){  
       String     msg = SETLEDS(0) ; // set  all LEDs off.
        sendData("Wifi says : LEDOFF\
");   // Send confirmation  of Command + CR  
        Send_inputs(); // Send Analouge inputs     
    }   
    else if (inMsg.indexOf("LEDONN",0)>6 ){  // if Command is to set a  Number
         d = inMsg.indexOf("LEDONN",0)+6; // Set d to next letter after  command // string starts with zero
     int a = 0; // zero collected number
     int dt = inMsg.length(); // find end of string (CR)
    if ( d+3 < dt){              // if there is a 4 digit number after command
            a = inMsg.substring(d,  d+4).toInt(); // store 4 digits in number a
      String    msg ="ERROR";
            if ((a > 0) & (a < 1024) ) {  // Command not used for zero (use LEDOFF),  avoids no number available
             msg = SETLEDS(a) ; // set all LEDs on  or off, returns Binary string as confirmation
             }
             msg  = "Wifi says : LEDONN="+msg+"\
";
            sendData(msg ); // Send confirmation  of Command + CR
             Send_inputs();  // Send Analouge inputs
             }
   }
   // delay(9000);                              // deliberately large delay  to help collect dump of serial port.
}
     inMsg="";  // Clear buffer
    delay(800); // delay to stop duplicate messages
}
void sendToWifi(String  command, const int timeout){
// only send command, not intereted in response
  String response = "";
  // Serial.print("Sent command to ESP8266-E12: ");
   // Serial.print(command);
  delay(50);
  portOne.println(command); 
  long int time = millis();
  while( (time+timeout) > millis())
  {
    while(portOne.available())
    { 
      char c = portOne.read(); 
      response+=c;
    }  
  }

   // Serial.print("Response from ESP8266-E12: ");
   // Serial.print(response);
}

String  readFromWifi(){
  char arrayInMsg[100];
  String tempStr; 
  int count  =0;
  while( portOne.available() > 0 ){
  
    arrayInMsg[count]= portOne.read();
    delay(80);
    // get out if you see CR or LF
    if ((arrayInMsg[count]=='\n')  or (arrayInMsg[count]=='\r')) break; 
    // changed character array comparison  or it causes errors
    count++;       
  }
  arrayInMsg[count] = '\\0';                     // Null terminate finally
  tempStr = String (arrayInMsg);                // cast it to string
  tempStr.trim();                               //  precaution
  // Serial.print(tempStr);
  return tempStr;
}
/*
* Name:  sendData
* Description: Function used to send string to tcp client using cipsend
*  Params: 
* Returns: void
*/
 void sendData(String str){
  String len="";
  len+=str.length();
  sendToWifi("AT+CIPSEND=0,"+len,responseTime); // Setup  command to send str data length to channel 0
  delay(100);
  sendToWifi(str,responseTime);//Send  String str with 0 closing the transmission and return to AT mode
   delay(100);
  do {
  delay(100);
  } while (portOne.available()==0); // wait untill response  data "sent" or "failed"
}

String  SETLEDS(int long pulse) {
  pulse=  pulse << 4; // move numbers up to pin 4
 String response2 = "" ;
    for  ( int x = 13; x >3 ; x--)  { // Pins 13 down to 4
    if (pulse & (1 << x)) {  // compare pulse with bit number of Digital output port
     digitalWrite(x,HIGH);
     response2 = response2 + "1";
     // Serial.print("1"); // just for  testing
    }
    else {
     digitalWrite(x,LOW);
     response2 =  response2 + "0";
    // Serial.print("0"); // just for testing
     }
     }
    // Serial.println(""); // just for testing
     return response2;  // Return Binary string
  }
// Send Analouge data
void Send_inputs(){
  delay (1000);
  Msg = Sensor_Read(); // replace Msg with Analouge input string
        Msg = "Analoue Reads 0-7:"+ Msg + "\
";
        sendData(Msg);    //  Send Analouge inputs + CR
}
  // Read all analouge inputs routine
String  Sensor_Read(){
  String response3 = "" ;
  for (int y = 0; y < sensorPin;  y++) { // read ALL analouge inputs
  String an = "A" + String(y,DEC);      //  format for Pin numbers
 int f = an.toInt(); // turn string into a Analouge Input  pin number
 response3 = response3 + String(analogRead(f),DEC); // add value to  string
 if (y < sensorPin-1){
 response3 = response3 +",";    // add a comma  if not last number
 }
 }
  return response3;            // return string  of numbers to loop
}
[/code]

Downloadable files

1K resistor complusory

Use instead of 220 ohms colours shown in Fritzog.

1K resistor complusory

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