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Arduino Humidity Meter with DHT11 and I2C OLED display
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| // Written by EmbeddedUser | |
| // Refer to blog http://www.jaimeferns.in/2016/10/how-to-build-humidity-and-temperature.html | |
| // Youtube Video https://www.youtube.com/watch?v=g-rcEd_2I-w | |
| // Humidity meter with DHT11, Arduino and I2c OLED display | |
| // Now support displaying sensor error and configuring deg C or deg F | |
| #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, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 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, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 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, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, | |
| 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 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(); | |
| 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!"); | |
| 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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