How to Upload Sensor Data to Cloud

How to Upload Sensor Data to Cloud - ThingSpeak

Siva Rama Krishna September 29, 2019 NodeMcu(ESP8266) - WiFi Projects No comments :

This project focuses on transforming your NodeMCU into a gateway device, facilitating the uploading of sensor data to the ThingSpeak server. This tutorial provides instructions for users to gauge ambient temperature and humidity, with the recorded values transmitted to a personal cloud server on ThingSpeak every 15 seconds. This enables users to visualize both sets of data on a web page. To accomplish data transmission to ThingSpeak using a NodeMCU, it is essential to have a NodeMCU with network connectivity. Additionally, ThingSpeak necessitates a user account and the creation of a channel, which serves as the destination for sending and storing data.

Requirements:

NodeMcu-12E (ESP8266)
DHT-11
Jumper Wires

Connection Diagram:

How to Upload Sensor Data to Cloud - ThingSpeak, Making your NodeMCU as a gateway device for uploading your sensor data on ThingSpeak server. This tutorial allows the user to measure the surrounding temperature and humidity, measured values are sent to a personal cloud server in Thingspeak for every 15 seconds , so you will be able to see both visualization in a web page.

How to Add NodeMcu -12E(ESP8266) Board to Arduino IDE

Sign Up For ThingSpeak:

Visit https://thingspeak.com/ and create an account.

Generate a new channel, and subsequently, navigate to API keys. Copy the API key and paste it into your program.

How to create ThingSpeak account and Channels

Code:

#include <ESP8266WiFi.h>

#include <DHT.h>

#define DHTPIN D2

#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);

const char* ssid = " Your Wi-Fi Network name"; // replace with your Wi-Fi ssid

const char* password = " Wi-Fi Network Password ";

const char* host = "api.thingspeak.com";

const char* privateKey = " Your thingSpeak API Key"; / Enter your Write API key from ThingSpeak

void setup() {

Serial.begin(115200);

delay(10);

// We start by connecting to a WiFi network

Serial.println();

Serial.print("Connecting to ");

Serial.println(ssid);

WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {

delay(500);

Serial.print(".");

}

Serial.println("");

Serial.println("WiFi connected");

Serial.println("IP address: ");

Serial.println(WiFi.localIP());

}

float value, temp;

void loop() {

delay(15000);

float h = dht.readHumidity();

float t = dht.readTemperature();

Serial.print("connecting to ");

Serial.println(host);

// Use WiFiClient class to create TCP connections

WiFiClient client;

const int httpPort = 80;

if (!client.connect(host, httpPort)) {

Serial.println("connection failed");

return;

}

// We now create a URL for the request

String url = "/update";

url += "?api_key=";

url += privateKey;

url += "&field1=";

url += t;

url += "&field2=";

url += h;

Serial.print("Requesting URL: ");

Serial.println(url);

// This will send the request to the server

client.print(String("GET ") + url + " HTTP/1.1\r\n" +

"Host: " + host + "\r\n" +

"Connection: close\r\n\r\n");

delay(10);

// Read all the lines of the reply from server and print them to Serial

while(client.available()){

String line = client.readStringUntil('\r');

Serial.print(line);

}

Serial.println();

Serial.println("closing connection");

}
Output:

Open your Thingspeak account and click on channel private view, output will be shown as graph.

This tutorial allows the user to measure the surrounding temperature and humidity, measured values are sent to a personal cloud server in Thingspeak for every 15 seconds , so you will be able to see both visualization in a web page. In order to send data to ThingSpeak using a Node MCU, you need an NodeMCU with network connectivity. ThingSpeak requires a user account and a channel. A channel is where you can send data and stores data.

For Additional Projects Click Below Links:

Text To Speech App using MIT App Inventor

Bluetooth Control App using MIT App Inventor

Control LED Using HC-05 Bluetooth, Arduino and Mobile App