kunsh13
Published © GPL3+

Humidity Temperature Project

I have created the project to capture Humidity and Temperature. OLED screen is compact and very bright.

IntermediateFull instructions provided2 hours153
Humidity Temperature Project

Things used in this project

Hardware components

Arduino UNO & Genuino UNO
Arduino UNO & Genuino UNO
×1
i2c oled display
×1
DHT11 Temperature & Humidity Sensor (4 pins)
DHT11 Temperature & Humidity Sensor (4 pins)
×1
Jumper wires (generic)
Jumper wires (generic)
×1
Breadboard (generic)
Breadboard (generic)
×2

Software apps and online services

Arduino IDE
Arduino IDE
Just upload and work no errors

Story

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Code

Humidity Temperature Project code

Arduino
Humidity meter with DHT11 , 22 or 21, Arduino and I2c OLED display support displaying sensor error and configuring deg C or deg F also display temperature in serial monitor
/*Code start
Made  by kunsh13
refer to videeo https://youtu.be/dFksEX6Vnfc
  Humidity meter with DHT11 , 22 or 21, Arduino and I2c OLED display support displaying sensor error and configuring deg C or deg F also display temperatre in serial monitor
*/

#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 3          // 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 =
{
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};

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();

  do
  {
    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();
      do 
      {
        // 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();
      do
      {
        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!/sensor error");
    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;
}
//code ends
//thanks for using this code mabe by kunsh maurya 

Credits

kunsh13

kunsh13

1 project • 0 followers

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