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Arduino - Weather Station

· One min read
Gabriel J. Csapo

This tutorial goes over how to use the following to make a functioning weather station! 🌦

Supplies​

  • (1) ESP8266 Wi-Fi Microcontroller (NodeMCU v3)
  • (1) 0.96 " OLED 1306
  • (1) DHT11
  • (8) Jumper wires

For reference I have included the pinout diagram for the ESP8266 Wi-Fi Microcontroller (NodeMCU v3) that I am using.

ESP8266 Wi-Fi Microcontroller (NodeMCU V3) Pinout
ESP8266 Wi-Fi Microcontroller (NodeMCU V3) Pinout

Setup​

Weather Station Setup Diagram
Weather Station Setup Diagram

Code​

For this project, we are using the following libraries:

  1. Adafruit_GFX
  2. Adafruit_SSD1306
  3. Adafruit_Sensor

For information on how to install the libraries above please visit https://www.arduino.cc/en/guide/libraries.

#include <Wire.h>#include <Adafruit_GFX.h>#include <Adafruit_SSD1306.h>#include <Adafruit_Sensor.h>#include <DHT.h>#define SCREEN_WIDTH 128 // OLED display width, in pixels#define SCREEN_HEIGHT 64 // OLED display height, in pixels// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);#define DHTPIN 14 // Digital pin connected to the DHT sensorDHT dht(DHTPIN, DHT11);void setup(){    Serial.begin(115200);    dht.begin();    if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C))    {        Serial.println(F("SSD1306 allocation failed"));        for (;;)            ;    }    delay(2000);    display.clearDisplay();    display.setTextColor(WHITE);}void loop(){    delay(5000);    // read temperature and humidity    float t = dht.readTemperature();    float h = dht.readHumidity();    // clear display    display.clearDisplay();    if (isnan(h) || isnan(t))    {        // display error message        Serial.println("Failed to read from DHT sensor!");        display.setCursor(0, 0);        display.setTextSize(1);        display.print("Failed to read from DHT sensor!");    }    else    {        // display temperature        display.setTextSize(1);        display.setCursor(0, 0);        display.print("Temperature: ");        display.setTextSize(2);        display.setCursor(0, 10);        display.print(t);        display.print(" ");        display.setTextSize(1);        display.cp437(true);        display.write(167);        display.setTextSize(2);        display.print("C");        // display humidity        display.setTextSize(1);        display.setCursor(0, 35);        display.print("Humidity: ");        display.setTextSize(2);        display.setCursor(0, 45);        display.print(h);        display.print(" %");    }    display.display();}

If all the parts are working accordingly, you will see the following for having a DHT11 sensor and when you don't.

States of being able to read the DHT11 sensor data.

If you want to display the output as Fahrenheit all you need to do is change dht.readTemperature(); to dht.readTemperature(true);. Changing the following and changing display.print("C"); to display.print("F"); will yeild the following results.

Weather station with Fahrenheit instead of Celsius
Weather station with Fahrenheit instead of Celsius