Arduino - Weather Station
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 refrence I have included the pinout diagram for the ESP8266 Wi-Fi Microcontroller (NodeMCU v3) that I am using.

Setup

Code
For this project we are using the following libraries:
- Adafruit_GFX
- Adafruit_SSD1306
- Adafruit_Sensor
For information on how to install the libraries above please visist 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 sensor
DHT 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.


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