DIY Arduino based Weather Station

Using a display to view the temperature and humidity of your environment can be possible using the DHT11 sensor and an Arduino. For this project, we will be using the OLED I2C SSD1306 display module to display the temperature and humidity readings gathered from the environment using the DHT11 temperature and humidity sensor.

We will use the u8glib and DHT Library to communicate with the display and sensor respectively. Both libraries can be downloaded through Arduino IDE Library Manager of manually from the links below (after downloading, unzip the folder and place it in Arduino libraries folder, for example C:\Program Files\Arduino\libraries).

===>> u8glin Library -- https://www.arduinolibraries.info/libraries/u8g2

===>> DHT Library -- https://www.arduinolibraries.info/libraries/dht-sensor-library

Watch Full Video on YouTube (Tamil) :

Components :

==> Arduino Board (any board can be used) -- Click Here

==> DHT11 Sensor -- Click Here

==> OLED Display -- Click Here

Circuiting :

SSD1306 OLED - Arduino Board

SSD1306 OLED GND goes to Arduino GND

SSD1306 OLED VDD to Arduino 5V

SSD1306 OLED SDA pin (serial data) to pin A4

SSD1306 OLED SCK pin (serial clock) to pin A

DHT 11 - Arduino Board

DHT11 goes ( - ) to Arduino GND

DHT11 goes ( + ) to Arduino VCC

DHT11 goes ( out ) to Arduino D2

Coding :

How to upload code to Arduino : Click Here

Copy the code below and just upload in your Arduino board via IDE Software.

Enjoy Coding !

#include <DHT.h>

#include "U8glib.h"

// Display defaults to Degree F. TO use metric display,

// comment out next line to display temperature in Degree C,

#define METRIC

#define DHTPIN 2 // what digital pin we're connected to

// Uncomment whatever type you're using!

#define DHTTYPE DHT11 // DHT 11

//#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321

//#define DHTTYPE DHT21 // DHT 21 (AM2301)

// Connect pin 1 (on the left) of the sensor to +5V

// NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1

// to 3.3V instead of 5V!

// Connect pin 2 of the sensor to whatever your DHTPIN is

// Connect pin 4 (on the right) of the sensor to GROUND

// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor

// Initialize DHT sensor.

// Note that older versions of this library took an optional third parameter to

// tweak the timings for faster processors. This parameter is no longer needed

// as the current DHT reading algorithm adjusts itself to work on faster procs.

DHT dht(DHTPIN, DHTTYPE);

U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NO_ACK); // Display which does not send AC

//U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE|U8G_I2C_OPT_DEV_0); // I2C / TWI

//U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_DEV_0|U8G_I2C_OPT_NO_ACK|U8G_I2C_OPT_FAST); // Fast I2C / TWI

//U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NO_ACK); // Display which does not send AC

const uint8_t logo[] PROGMEM =

{

0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,

0x0, 0x0, 0x0, 0x18, 0x0, 0x38, 0x6, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1, 0xc3,

0x80, 0x0, 0x0, 0x0, 0x18, 0x0, 0x38, 0x6, 0x0, 0x40, 0x0, 0x0, 0x0, 0x0, 0x1,

0xc3, 0x80, 0x0, 0x0, 0x0, 0x0, 0x0, 0x38, 0x0, 0x0, 0xc0, 0x0, 0x0, 0x0, 0x0,

0x1, 0xc3, 0x80, 0x0, 0x0, 0x0, 0x0, 0x0, 0x38, 0x0, 0x0, 0xc0, 0x0, 0x0, 0x0,

0x0, 0x1, 0xc3, 0x8e, 0xc, 0x6e, 0x60, 0xf8, 0x7, 0xb8, 0x3e, 0x3, 0xfc, 0x38, 0x18,

0x0, 0x0, 0x1, 0xc3, 0x8e, 0xc, 0x7e, 0xf0, 0xf8, 0xf, 0xf8, 0x3e, 0x3, 0xfc, 0x38,

0x38, 0x0, 0x0, 0x1, 0xff, 0x8e, 0xc, 0x77, 0x30, 0x18, 0xe, 0x38, 0x6, 0x0, 0xc0,

0x18, 0x30, 0x0, 0x0, 0x1, 0xff, 0x8e, 0xc, 0x67, 0x30, 0x18, 0x1c, 0x38, 0x6, 0x0,

0xc0, 0x1c, 0x30, 0x0, 0x0, 0x1, 0xff, 0x8e, 0xc, 0x63, 0x30, 0x18, 0x1c, 0x38, 0x6,

0x0, 0xc0, 0xc, 0x70, 0x0, 0x0, 0x1, 0xc3, 0x8e, 0xc, 0x63, 0x30, 0x18, 0x1c, 0x18,

0x6, 0x0, 0xc0, 0xc, 0x60, 0x0, 0x0, 0x1, 0xc3, 0x8e, 0xc, 0x63, 0x30, 0x18, 0x1c,

0x18, 0x6, 0x0, 0xc0, 0xe, 0x60, 0x0, 0x0, 0x1, 0xc3, 0x86, 0x1c, 0x63, 0x30, 0x18,

0x1c, 0x18, 0x6, 0x0, 0xc0, 0x6, 0xc0, 0x0, 0x0, 0x1, 0xc3, 0x87, 0x1c, 0x63, 0x30,

0x18, 0xe, 0x38, 0x6, 0x0, 0xe0, 0x7, 0xc0, 0x0, 0x0, 0x1, 0xc3, 0x87, 0xec, 0x63,

0x31, 0xff, 0x8f, 0xd8, 0x7f, 0xe0, 0xfe, 0x3, 0xc0, 0x0, 0x0, 0x1, 0xc3, 0x83, 0xcc,

0x63, 0x31, 0xff, 0x87, 0x98, 0x7f, 0xe0, 0x7e, 0x3, 0x80, 0x0, 0x0, 0x0, 0x0, 0x0,

0x0, 0x0, 0x0, 0x0, 0x0, 0x10, 0x0, 0x0, 0x0, 0x3, 0x80, 0x0, 0x0, 0x0, 0x0,

0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x7, 0x0, 0x0, 0x0, 0x0,

0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1f, 0x0, 0x0, 0x0,

0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1e, 0x0, 0x0,

0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,

0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3c, 0x38, 0x0, 0x0, 0x80, 0x0, 0x0, 0x0,

0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3c, 0x78, 0x0, 0x1, 0x80, 0x0, 0x0,

0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3c, 0x78, 0x0, 0x1, 0x80, 0x0,

0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3e, 0x78, 0x3e, 0x7, 0xf8,

0xf, 0x81, 0xcf, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x36, 0xd8, 0x7f, 0x7,

0xf8, 0x1f, 0xc0, 0xdf, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x36, 0xd8, 0xe1,

0x81, 0x80, 0x38, 0x60, 0xf0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x33, 0xd8,

0xc1, 0xc1, 0x80, 0x30, 0x70, 0xe0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x33,

0x99, 0xff, 0xc1, 0x80, 0x7f, 0xf0, 0xe0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,

0x33, 0x99, 0xff, 0xc1, 0x80, 0x7f, 0xf0, 0xc0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,

0x0, 0x31, 0x99, 0xc0, 0x1, 0x80, 0x70, 0x0, 0xc0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,

0x0, 0x0, 0x30, 0x18, 0xc0, 0x1, 0x80, 0x30, 0x0, 0xc0, 0x0, 0x0, 0x0, 0x0, 0x0,

0x0, 0x0, 0x0, 0x30, 0x18, 0xe1, 0xc1, 0xc0, 0x38, 0x70, 0xc0, 0x0, 0x0, 0x0, 0x0,

0x0, 0x0, 0x0, 0x0, 0x30, 0x18, 0x7f, 0x81, 0xfc, 0x1f, 0xe0, 0xc0, 0x0, 0x0, 0x0,

0x0, 0x0, 0x0, 0x0, 0x0, 0x30, 0x18, 0x3e, 0x0, 0xfc, 0xf, 0x80, 0xc0, 0x0, 0x0,

0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,

0x0, 0x0, 0x0, 0x0

};

bool first = true;

float hum = 0.0;

float temp = 0.0;

float hIndex = 0.0;

bool dht_test(float* humPerc, float* tempF, float* heatIndex);

void setup(void)

{

Serial.begin(9600);

dht.begin();

first = true;

// assign default color value

if (u8g.getMode() == U8G_MODE_R3G3B2)

{

u8g.setColorIndex(255); // white

}

else if (u8g.getMode() == U8G_MODE_GRAY2BIT)

{

u8g.setColorIndex(3); // max intensity

}

else if (u8g.getMode() == U8G_MODE_BW)

{

u8g.setColorIndex(1); // pixel on

}

else if (u8g.getMode() == U8G_MODE_HICOLOR)

{

u8g.setHiColorByRGB(255, 255, 255);

}

// picture loop

u8g.firstPage();

{

u8g.drawBitmapP(0, 0, 16, 64, logo);

}

while (u8g.nextPage());

dht_test(&hum, &temp, &hIndex);

}

void HumMeter(float* humPerc, float* temp, float* heatIndex)

{

u8g.setFont(u8g_font_fub11);

u8g.setFontRefHeightExtendedText();

u8g.setDefaultForegroundColor();

u8g.setFontPosTop();

u8g.drawStr(4, 0, "Hum %");

u8g.setPrintPos(80, 0);

u8g.print(*humPerc);

#ifdef METRIC

// if metric system, display Celsius

u8g.drawStr(4, 20, "Temp C");

#else

//display Farenheit

u8g.drawStr(4, 20, "Temp F");

#endif

u8g.setPrintPos(80, 20);

u8g.print(*temp);

u8g.drawStr(4, 40, "Heat Ind");

u8g.setPrintPos(80, 40);

u8g.print(*heatIndex);

}

void loop(void)

{

bool result = dht_test(&hum, &temp, &hIndex);

if (first)

{

// skip displaying readings first time, as its stale data.

first = false;

}

else

{

if(result == false)

{

u8g.firstPage();

{

// sensor error

u8g.setFont(u8g_font_fub11);

u8g.setFontRefHeightExtendedText();

u8g.setDefaultForegroundColor();

u8g.setFontPosTop();

u8g.drawStr(10, 30, "Sensor Error");

}

while (u8g.nextPage());

}

else

{

u8g.firstPage();

{

HumMeter(&hum, &temp, &hIndex);

}

while (u8g.nextPage());

}

bool dht_test(float* humPerc, float* temp, float* heatIndex)

{

// Wait a few seconds between measurements.

delay(2000);

*humPerc = 0;

*temp = 0;

*heatIndex = 0;

// Reading temperature or humidity takes about 250 milliseconds!

// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)

float h = dht.readHumidity();

// Read temperature as Celsius (the default)

float t = dht.readTemperature();

// Read temperature as Fahrenheit (isFahrenheit = true)

float f = dht.readTemperature(true);

// Check if any reads failed and exit early (to try again).

if (isnan(h) || isnan(t) || isnan(f))

{

Serial.println("Failed to read from DHT sensor!");

return false;

}

// Compute heat index in Fahrenheit (the default)

float hif = dht.computeHeatIndex(f, h);

// Compute heat index in Celsius (isFahreheit = false)

float hic = dht.computeHeatIndex(t, h, false);

Serial.print("Humidity: ");

Serial.print(h);

Serial.print(" %\t");

Serial.print("Temperature: ");

Serial.print(t);

Serial.print(" *C ");

Serial.print(f);

Serial.print(" *F\t");

Serial.print("Heat index: ");

Serial.print(hic);

Serial.print(" *C ");

Serial.print(hif);

Serial.println(" *F");

*humPerc = h;

#ifdef METRIC

// metric system, load degree celsius

*temp = t;

*heatIndex = hic;

#else

*temp = f;

*heatIndex = hif;

#endif

return true;

}

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Robotics Tamil

DIY Arduino based Weather Station

Components :

Circuiting :

SSD1306 OLED - Arduino Board

DHT 11 - Arduino Board

Coding :

Promotion :

TO buy Quality and Cheap Electronic components Connect to KANISH ROBOTICS.

Contact NO. : 9344421567

Instagram : instagagram/kanishrobotics

Thanks for Reading this blog...

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