ESP8266 IOT Using Arduino and ThingSpeak

About: Electronics Component - PCB [Design, Printing, Inserting] - Electronic Programming

Internet of Things (IoT) is a concept that aims to expand the benefits of connected internet connectivity continuously -the ability to share data, remote control, and etc, as well as on objects in the real world. For example, food, electronics, collectibles, any equipment, including living things that are all connected to local and global networks through embedded and active sensors.

Here is an example program of Arduino IoT using ESP8266 Wireless Module -how to send data in the form of random value, which can be monitored from anywhere by utilizing the free IOT service provider -ThingSpeak.

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Step 1: Materials You Need

You will need:

  1. ESP-8266 Wireless Module
  2. SFE Duino
  3. Male to Female Jumper Wires

Step 2: Setup

Connect SFE Duino and ESP-8266 Wirelss Module with jumper wires as schematic above.

Step 3: Connect With ThingSpeak

Once you've connected the materials, visit ThingSpeak and create an account there. And then, create a new channel.

Step 4: Code

After that, you can upload the code below and make sure to fill the data as yours -start from API key and Field name, and also Access Point setting which will be connected to ESP-8266 Wireless Module (AP and Password).

#include
#define DEBUG true
#define RX 2
#define TX 3

String HOST = "api.thingspeak.com";
String PORT = "80";
String AP = "AP NAME";
String PASS = "AP PASSWORD";


String API = "CJZ1G46URZWEGRVR";
String field = "field1";

int countTrueCommand;
int countTimeCommand;
boolean found = false;
int valSensor = 1;

SoftwareSerial esp8266(RX,TX);
void setup() {

Serial.begin(9600);
esp8266.begin(115200);

sendCommand("AT",5,"OK");
sendCommand("AT+CWMODE=1",5,"OK");
sendCommand("AT+CWJAP=""+ AP +"",""+ PASS +""",15,"OK");
countTrueCommand = 0;

}

void loop() {

String getData = "GET /update?api_key="+ API +"&"+ field +"="+String(valSensor);
switch(countTrueCommand) {

case 0: sendCommand("AT",5,"OK");break;
case 1: sendCommand("AT+RST",10,"invalid");break;
case 2: sendCommand("AT+CIPMUX=1",5,"OK"); break;
case 3: sendCommand("AT+CIPSTART=0,"TCP","+ HOST +","+ PORT,15,"OK"); break;
case 4: sendCommand("AT+CIPSEND=0," +String(getData.length()+4),4,">"); break;
case 5: esp8266.println(getData);delay(1500);countTrueCommand++; break;
case 6: sendCommand("AT+CIPCLOSE=0",5,"OK"); break;
case 7:

Serial.println(valSensor);
Serial.print(getData);
Serial.print(",");
Serial.println(getData.length());
valSensor = random(100000); // random value, change with sensor value if using sensor
countTrueCommand = 0;
delay(10000);
break;

}

}
void sendCommand(String command, int maxTime, char readReplay[]) {

Serial.print(countTrueCommand);
Serial.print(". at command => ");
Serial.print(command);
Serial.print(" ");
while(countTimeCommand < (maxTime*1))

{

esp8266.println(command);//at+cipsend
if(esp8266.find(readReplay))//ok
{

found = true;
break;

}
countTimeCommand++;

}
if(found == true)
{

Serial.println("OYI");

countTrueCommand++;
countTimeCommand = 0;

}
if(found == false)
{

Serial.println("Fail");
countTrueCommand = 0;
countTimeCommand = 0;

}
found = false;

}

Step 5: Monitor It!

After you upload it, make sure that the Wifi you used connected with internet connection. Then, open serial monitoring to see AT Command data. Data which sent is a random data. You can change it with data of sensor or etc. Here is the value of monitoring result after many data processing.

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    13 Discussions

    0
    None
    SharadD3

    Question 2 months ago

    my arduino ide is showing error for "sendCommand" how should I fix this problem?

    Arduino: 1.8.9 (Windows 10), Board: "Arduino/Genuino Uno"
    C:\Users\Dasari\AppData\Local\Temp\arduino_modified_sketch_505484\Sserial.ino: In function 'void setup()':
    Blink:33:39: error: 'send_command' was not declared in this scope
    send_command("AT+RST\r\n",2000,DEBUG);
    ^
    exit status 1
    'send_command' was not declared in this scope
    This report would have more information with
    "Show verbose output during compilation"
    option enabled in File -> Preferences.

    0
    None
    sayeda24

    2 months ago

    this code is not working ,getting fail error
    can you post right code


    0
    None
    93ahire

    1 year ago

    /*this is 100% working program just change your AP name pass and things speak password*/

    #include <SoftwareSerial.h>

    #define DEBUG true

    #define RX 8

    #define TX 7

    String HOST = "api.thingspeak.com";

    String PORT = "80";

    String AP = "XXXX";//your AP name

    String PASS = "XXXX";\\your AP password

    String API = "XxxXPF**V6**OEIL";//your API

    String field = "field1";

    int countTrueCommand;

    int countTimeCommand;

    boolean found = false;

    int valSensor = 1;

    SoftwareSerial esp8266(RX,TX);

    void setup() {

    Serial.begin(9600);

    esp8266.begin(115200);

    Serial.println("AT+CWJAP=\""+AP+"\",\""+PASS+"\"");

    sendCommand("AT",5,"OK");

    sendCommand("AT+CWMODE=1",5,"OK");

    sendCommand("AT+CWJAP=\""+AP+"\",\""+PASS+"\"",15,"OK");

    countTrueCommand = 0;

    }

    void loop() {

    String readDat="GET https://api.thingspeak.com/channels/9/feeds.json?...

    String getData = "GET /update?api_key="+ API +"&"+ field +"="+String(valSensor);

    switch(countTrueCommand) {

    case 0: sendCommand("AT",5,"OK");break;

    case 1: sendCommand("AT+RST",10,"OK");break;

    case 2: sendCommand("AT+CIPMUX=1",5,"OK"); break;

    case 3: sendCommand("AT+CIPSTART=0,\"TCP\",\""+ HOST +"\","+ PORT,15,"OK"); break;

    case 4: sendCommand("AT+CIPSEND=0," +String(getData.length()+4),4,">"); break;

    case 5: esp8266.println(getData);delay(1500);countTrueCommand++; break;

    case 6: sendCommand("AT+CIPCLOSE=0",5,"OK"); break;

    case 7:

    Serial.println(valSensor);

    Serial.print(getData);

    Serial.print(",");

    Serial.println(getData.length());

    valSensor = random(100000); // random value, change with sensor value if using sensor

    countTrueCommand = 0;

    delay(10000);

    break;

    }

    }

    void sendCommand(String command, int maxTime, char readReplay[]) {

    Serial.print(countTrueCommand);

    Serial.print(". at command => ");

    Serial.print(command);

    Serial.print(" ");

    while(countTimeCommand < (maxTime*1))

    {

    esp8266.println(command);//at+cipsend

    if(esp8266.find(readReplay))//ok

    {

    found = true;

    break;

    }

    countTimeCommand++;

    }

    if(found == true)

    {

    Serial.println("OYI");

    countTrueCommand++;

    countTimeCommand = 0;

    }

    if(found == false)

    {

    Serial.println("Fail");

    countTrueCommand = 0;

    countTimeCommand = 0;

    }

    found = false;

    }

    3 replies
    0
    None
    RuodiW93ahire

    Reply 1 year ago

    after running this program it is working, but always fail at the AT phase, and shows 0. at command => AT Fail, how to fix this problem?

    1523132079.png
    0
    None
    sayeda24RuodiW

    Reply 2 months ago

    I got same error ,Mr.100% working can you reply ,posting wrong code

    0
    None
    Krusher9993ahire

    Reply 7 months ago

    Hi 93ahire, I am struggling with your code to the effect that it compiles and uploads to my esp8266 but fails to connect to my access point. what can I use to troubleshoot/ get error messages.

    0
    None
    annesha

    Question 9 months ago on Step 4

    If i need to check the connection status of the WiFi what should i do?

    0
    None
    Jeff Quek

    1 year ago

    Hi, can I replace the random(10000) with flow sensor value? how to replace it? I tried, it show in serial monitor but no upload in the thingspeak. Please advise. Thank you.

    0
    None
    DinkarJ

    1 year ago

    Error in the code can be corrected as follows--

    in line 1 :

    #include <SoftwareSerial.h>

    and change the code at case 3 as :

    case 3: sendCommand("AT+CIPSTART=0,TCP,"+ HOST +","+ PORT,15,"OK"); break;

    0
    None
    humidif

    Question 1 year ago on Step 5

    What is the baud rate to be fixed

    0
    None
    kishanr19

    Question 1 year ago on Step 4

    While compiling, i get this error

    expected ')' before 'TCP'

    After that, I added '+' to front and back of TCP. Then It gave

    'TCP' not found in this scope.

    0
    None
    harshkat

    1 year ago

    some error in the given code