Data form evive to Cloud

This tutorial describes how we can use esp8266 wifi module to send our data to thingspeak cloud

INFO

Programming Platform: Arduino IDE Type: Tutorial Difficulty: Intermediate Estimated Time: 4 hours

Components Required

Component	Quantity	Available in Kit
evive	1	evive
USB A-B Cable	1	evive
ESP8266 Module (ESP-12)	1	IoT Kit Home Automation Kit

Introduction

The Internet of things is the interface of physical devices embedded with electronics, software, sensors, actuators, and network connectivity which enables these objects to connect and transfer data over the cloud.

In this tutorial, we are going to demonstrate Internet of Things by sending data to the thingspeak cloud platform.

In this tutorial to demonstrate any sensor, we are using potentiometer 1 of evive to read analog state and upload it to cloud.

Setting Up Thingspeak:

Go to thingspeak.com
Click on Sign in or Sign up.
Link your Mathworks account. (optional till 10th January 2018)
In Channels tab click on my channels.
Click on new Channel.
Enter Name and Description
Add Fields as you need. (In our case one)
Name your Fields ( In our case P1)
Save Channel.
Under API keys you can find Write API key.
Copy Write API key.
Start Arduino Programming.

Code Algorithm:

Include ESP8266 Library
Select your WiFi SSID and Password.
enter your Write API key in KEY
Connect WiFi.
Get IP address
Disable Multiplexing
Create a buffer for storing data.
Establish TCP connection to Host using host port.
Make an HTTP request using GET method
Receive data for debugging purpose.
Release TCP connection
Provide delay from 2s to 5s for proper operation.

Code:

#include "ESP8266.h"
#define SSID "AR" //enter your wifi ssid here
#define PASSWORD "qwerasdf" // enter your password here
#define HOST_NAME "api.thingspeak.com" //host is thingspeak
#define KEY "7I3O548R3K0I8Q9B" // enter your key here
#define HOST_PORT (80) //enter your host here
ESP8266 wifi(Serial3, 115200); // library function
int a = 0;
int b = 0;
void setup() {
 Serial.begin(115200);
 wifi.joinAP(SSID, PASSWORD);
 Serial.println(wifi.getLocalIP().c_str());
 wifi.disableMUX();
 Serial.print("setup end\r\n");
 delay(3000);
 pinMode(A9, INPUT);
}

void loop() {
 a = analogRead(A9);
 uint8_t buffer[1024] = {0};
 wifi.createTCP(HOST_NAME, HOST_PORT);
 String http = String();
 http += "GET /update?key=";
 http += KEY;
 http += "&amp;field1=" + String(a);
 http += " HTTP/1.1\r\n";
 http += "Host: api.thingspeak.com\r\n";
 http += "Connection: close\r\n\r\n";

Serial.println(http);
 wifi.send((const uint8_t*)http.c_str(), http.length());

uint32_t len = wifi.recv(buffer, sizeof(buffer), 10000);
 if (len &gt; 0) {
 Serial.print("Received:[");
 for (uint32_t i = 0; i &lt; len; i++) {
 Serial.print((char)buffer[i]);
 }
 Serial.print("]\r\n");
 }
 wifi.releaseTCP();
 delay(5000);
}

#include "ESP8266.h"

#define SSID "AR" //enter your wifi ssid here

#define PASSWORD "qwerasdf" // enter your password here

#define HOST_NAME "api.thingspeak.com" //host is thingspeak

#define KEY "7I3O548R3K0I8Q9B" // enter your key here

#define HOST_PORT (80) //enter your host here

ESP8266 wifi(Serial3, 115200); // library function

int a = 0;

int b = 0;

void setup() {

Serial.begin(115200);

wifi.joinAP(SSID, PASSWORD);

Serial.println(wifi.getLocalIP().c_str());

wifi.disableMUX();

Serial.print("setup end\r\n");

delay(3000);

pinMode(A9, INPUT);

}

void loop() {

a = analogRead(A9);

uint8_t buffer[1024] = {0};

wifi.createTCP(HOST_NAME, HOST_PORT);

String http = String();

http += "GET /update?key=";

http += KEY;

http += "&field1=" + String(a);

http += " HTTP/1.1\r\n";

http += "Host: api.thingspeak.com\r\n";

http += "Connection: close\r\n\r\n";

Serial.println(http);

wifi.send((const uint8_t*)http.c_str(), http.length());

uint32_t len = wifi.recv(buffer, sizeof(buffer), 10000);

if (len > 0) {

Serial.print("Received:[");

for (uint32_t i = 0; i < len; i++) {

Serial.print((char)buffer[i]);

}

Serial.print("]\r\n");

}

wifi.releaseTCP();

delay(5000);

}