ESP8266 IOT Using Arduino and ThingSpeak

Intro: ESP8266 IOT Using Arduino and ThingSpeak

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.

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.

Comments

[Muchtar]

Hi, thanks for your share, are this code working with multiple sensors

[MonaA]

if i have tow filed How does the code become?

[MonaA]

if i have tow fields How does the code become?

[MonaA]

hello
if i have tow fields How does the code become?

[Tarun1114]

Hai Sir, I have given the connections as mentioned above but I found that my ESP8266 module power LED is slightly blinking. What changes I need to do.
Thanks in Advance.
I have purchased the ESP8266 module at
http://uitechies.co.in/BBBcircuits/product.php?product=serial-wi-fi-wireless-transceiver-module-iot-esp8266

[bwengyeduncan.bd]

Note that the wifi module uses 3.3v TTL logic so connection to 5v will damage it

[AarohanS1]

This setup works for me. Is it possible to add wifimanager into it? Kindly share how to do that.

[DePaul_250]

I am working on IoT using ESP8266 Node MCU and some cloud dashboards,
I need help about connecting NodeMCU on Wifi with no password
_#include <ESP8266WiFi.h>


const char *ssid = "Your wifi Network name";

const char *pass = "Network password";_

[SharadD3]

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.

[sayeda24]

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

[93ahire]

/*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;

}

[RuodiW]

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?

[sayeda24]

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

[Krusher99]

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.

[annesha]

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

[Jeff Quek]

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.

[DinkarJ]

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;

[humidif]

What is the baud rate to be fixed

[kishanr19]

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.

[harshkat]

some error in the given code