How to make an IoT based weather monitoring system using Nodemcu and Thingspeak
Hello, welcome back. In this tutorial, we will learn how to make an IoT based weather monitoring system using Nodemcu and Thingspeak. This project is mainly based on IoT technology. Also, if you don’t know about Thingspeak, click this link. Through this system, we can monitor factors such as temperature, humidity, pressure and rainfall. The DHT11, BMP180 and Rain sensors are used for that. Also, we can use this system mainly for farms and greenhouses. If you want to do this project using the Blynk app, click this link.
The process of this system
When this system is powered on, the Nodemcu board connects to the algorithm development system called MATLAB through the Thingspeak cloud. Then, values are obtained from the sensors. Also, these values are sent to the thingspeak app using the internet. Then, we can see the values as a visualization on the screen.
So, let’s do this project step by step. The required components are given below.
- Nodemcu board x 1 — Our Store / Amazon
- DHT11 sensor x 1 — Our Store / Amazon
- BMP180 sensor x 1 — Our Store / Amazon
- Rain sensor x 1 — Our Store / Amazon
- Breadboard x 1 — Our Store / Amazon
- Jumper wires — Our Store / Amazon
Disclosure: These Amazon links are Affiliate links. As an Amazon Associate, I earn from qualifying purchases.
Step 1
Firstly, identify these components.
Step 2
Secondly, connect these components. To do this, use the circuit diagram below.
Step 3
Thirdly, let’s set up the Thingspeak app. To do this, follow the steps below.
- First, go to the Thingspeak website and create a new account using your email address. Then, click the “New channel” button.
- Next, enter your project name as you like. Then, activate the four fields and name them Temperature, Humidity, Pressure, and Rainfall respectively. After, click the “Save channel” button.
- So, now we can see the interface of this project.
Step 4
Now, let’s create the program for this project. It is as follows.
- WI-Fi library — Download
- BMP180 library — Download
- DHT11 library — Download
- The complete program of this project – Download
/*Weather monitoring system with Thingspeak.
Created by the SriTu Hobby team.
Home Page
*/
#include <SFE_BMP180.h>
#include <Wire.h>
#include <ESP8266WiFi.h>
#include "DHT.h"
DHT dht(D3, DHT11);
SFE_BMP180 bmp;
double T, P;
char status;
WiFiClient client;
String apiKey = "";
const char *ssid = "";
const char *pass = "";
const char* server = "api.thingspeak.com";
void setup() {
Serial.begin(115200);
delay(10);
bmp.begin();
Wire.begin();
dht.begin();
WiFi.begin(ssid, pass);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
}
void loop() {
//BMP180 sensor
status = bmp.startTemperature();
if (status != 0) {
delay(status);
status = bmp.getTemperature(T);
status = bmp.startPressure(3);// 0 to 3
if (status != 0) {
delay(status);
status = bmp.getPressure(P, T);
if (status != 0) {
}
}
}
//DHT11 sensor
float h = dht.readHumidity();
float t = dht.readTemperature();
if (isnan(h) || isnan(t)) {
Serial.println("Failed to read from DHT sensor!");
return;
}
//Rain sensor
int r = analogRead(A0);
r = map(r, 0, 1024, 0, 100);
if (client.connect(server, 80)) {
String postStr = apiKey;
postStr += "&field1=";
postStr += String(t);
postStr += "&field2=";
postStr += String(h);
postStr += "&field3=";
postStr += String(P, 2);
postStr += "&field4=";
postStr += String(r);
postStr += "\r\n\r\n\r\n\r\n";
client.print("POST /update HTTP/1.1\n");
client.print("Host: api.thingspeak.com\n");
client.print("Connection: close\n");
client.print("X-THINGSPEAKAPIKEY: " + apiKey + "\n");
client.print("Content-Type: application/x-www-form-urlencoded\n");
client.print("Content-Length: ");
client.print(postStr.length());
client.print("\n\n\n\n");
client.print(postStr);
Serial.print("Temperature: ");
Serial.println(t);
Serial.print("Humidity: ");
Serial.println(h);
Serial.print("absolute pressure: ");
Serial.print(P, 2);
Serial.println("mb");
Serial.print("Rain");
Serial.println(r);
}
client.stop();
delay(1000);
}Code explanation
Firstly, library files are included.
#include <SFE_BMP180.h>
#include <Wire.h>
#include <ESP8266WiFi.h>
#include "DHT.h"Secondly, objects and variables are created for these libraries.
DHT dht(D3, DHT11);
SFE_BMP180 bmp;
double T, P;
char status;
WiFiClient client;Thirdly, let’s include the apiKey and WI-FI connection details.
String apiKey = "40BXKV4BEXQGXX5B";
const char *ssid = "SriTu Hobby";
const char *pass = "123456";
const char* server = "api.thingspeak.com";In the setup function,
void setup() {
//The serial monitor and libraries are beginning
Serial.begin(115200);
delay(10);
bmp.begin();
Wire.begin();
dht.begin();
WiFi.begin(ssid, pass);
//This code check WIFI status
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
}The loop function includes all the main functions. These are described below.
void loop() {
//BMP180 sensor
status = bmp.startTemperature();
if (status != 0) {
delay(status);
status = bmp.getTemperature(T);
//Calculates pressure values
status = bmp.startPressure(3);// 0 to 3
if (status != 0) {
delay(status);
status = bmp.getPressure(P, T);
if (status != 0) {
}
}
}
//DHT11 sensor
//Temperature and humidity values are obtained through the sensor
float h = dht.readHumidity();
float t = dht.readTemperature();
//The DHT11 sensor is checked
if (isnan(h) || isnan(t)) {
Serial.println("Failed to read from DHT sensor!");
return;
}
//Rain sensor
//Gets the rainfall values through the sensor
int r = analogRead(A0);
//Converts these values from 0 to 100
r = map(r, 0, 1024, 0, 100);
//This code sends sensor values to the Thingspeak app
if (client.connect(server, 80)) {
String postStr = apiKey;
postStr += "&field1=";
postStr += String(t);
postStr += "&field2=";
postStr += String(h);
postStr += "&field3=";
postStr += String(P, 2);
postStr += "&field4=";
postStr += String(r);
postStr += "\r\n\r\n\r\n\r\n";
client.print("POST /update HTTP/1.1\n");
client.print("Host: api.thingspeak.com\n");
client.print("Connection: close\n");
client.print("X-THINGSPEAKAPIKEY: " + apiKey + "\n");
client.print("Content-Type: application/x-www-form-urlencoded\n");
client.print("Content-Length: ");
client.print(postStr.length());
client.print("\n\n\n\n");
client.print(postStr);
//These values are printed on the serial monitor
Serial.print("Temperature: ");
Serial.println(t);
Serial.print("Humidity: ");
Serial.println(h);
Serial.print("absolute pressure: ");
Serial.print(P, 2);
Serial.println("mb");
Serial.print("Rain");
Serial.println(r);
}
client.stop();
delay(1000);
}Step 5
Next, select the board and port. After, upload this code to the Nodemcu board.
Step 6
Now, go back to the Thingspeak app and click the private view tab. Ok, enjoy this project. The full video guide is given below. So, we will meet in the next tutorial.
How to make an IoT based weather monitoring system using Nodemcu and Thingspeak
my thinkspeak is not updating cAN u tell y
Please check your WIFI details and tokens
I’m getting “failed to read from dht sensor!” error everytime on serial monitor. Pls help!
Check the jumper wires
how to download the Wi-Fi library please help.
check the blog
C:\Users\LENOVO\Downloads\weather_monitoring_thingspeak-20230812T091007Z-001\weather_monitoring_thingspeak\weather_monitoring_thingspeak.ino:1:10: fatal error: SFE_BMP180.h: No such file or directory
1 | #include
| ^~~~~~~~~~~~~~
compilation terminated.
exit status 1
Compilation error: SFE_BMP180.h: No such file or directory
what should i do ? i install all the BMP180 library too
Please include the BMP180 library file