DHT11 temperature/humidity sensor with 0.96'' OLED screen

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20

Here is my completed code, which i wrote myself from the ground up. Had to change the control structure to account for conflicting delays, then just did everything else using the u8g2 library functions as outlined in olikraus' wonderful reference manual:

// DHT Temperature & Humidity Sensor
// Unified Sensor Library Example
// Written by Tony DiCola for Adafruit Industries
// Released under an MIT license.

// Depends on the following Arduino libraries:
// - Adafruit Unified Sensor Library: https://github.com/adafruit/Adafruit_Sensor
// - DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library


#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <DHT_U.h>
#include <Arduino.h>
#include <U8g2lib.h>

#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif

#define DHTPIN            2         // Pin which is connected to the DHT sensor.

// Uncomment the type of sensor in use:
#define DHTTYPE           DHT11     // DHT 11 
//#define DHTTYPE           DHT22     // DHT 22 (AM2302)
//#define DHTTYPE           DHT21     // DHT 21 (AM2301)

// See guide for details on sensor wiring and usage:
//   https://learn.adafruit.com/dht/overview

U8G2_SSD1306_128X64_NONAME_F_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
DHT_Unified dht(DHTPIN, DHTTYPE);

const long screenInterval = 1000;           // interval at which to buffer (milliseconds)
unsigned long sensorInterval;
unsigned long previousMillis;

void setup() {
  u8g2.begin();
  dht.begin();
  u8g2.enableUTF8Print();
  u8g2.println("DHTxx Unified Sensor Example");
  // Print temperature sensor details.
  sensor_t sensor;
  dht.temperature().getSensor(&sensor);
  u8g2.println("------------------------------------");
  u8g2.println("Temperature");
  u8g2.print  ("Sensor:       "); u8g2.println(sensor.name);
  u8g2.print  ("Driver Ver:   "); u8g2.println(sensor.version);
  u8g2.print  ("Unique ID:    "); u8g2.println(sensor.sensor_id);
  u8g2.print  ("Max Value:    "); u8g2.print(sensor.max_value); u8g2.println(" *C");
  u8g2.print  ("Min Value:    "); u8g2.print(sensor.min_value); u8g2.println(" *C");
  u8g2.print  ("Resolution:   "); u8g2.print(sensor.resolution); u8g2.println(" *C");  
  u8g2.println("------------------------------------");
  // Print humidity sensor details.
  dht.humidity().getSensor(&sensor);
  u8g2.println("------------------------------------");
  u8g2.println("Humidity");
  u8g2.print  ("Sensor:       "); u8g2.println(sensor.name);
  u8g2.print  ("Driver Ver:   "); u8g2.println(sensor.version);
  u8g2.print  ("Unique ID:    "); u8g2.println(sensor.sensor_id);
  u8g2.print  ("Max Value:    "); u8g2.print(sensor.max_value); u8g2.println("%");
  u8g2.print  ("Min Value:    "); u8g2.print(sensor.min_value); u8g2.println("%");
  u8g2.print  ("Resolution:   "); u8g2.print(sensor.resolution); u8g2.println("%");  
  u8g2.println("------------------------------------");
    // Set delay between sensor readings based on sensor details.
 sensorInterval = sensor.min_delay / 1000;
}

void loop() {
  for(static unsigned long previousMillis=millis();
      millis()-previousMillis>=sensorInterval;
      previousMillis=millis()){
        u8g2.clearBuffer();
        // Get temperature event and print its value.
        sensors_event_t event;  
        dht.temperature().getEvent(&event);
        if(isnan(event.temperature)) {u8g2.setFont(u8g2_font_5x7_tf);
           u8g2.setCursor(0,15);
           u8g2.println("Error reading temperature!");
           }
           else {u8g2.setFont(u8g2_font_5x7_tf);
           u8g2.setCursor(0,15);
           u8g2.print("Temperature: ");
           u8g2.print(event.temperature);
           u8g2.println(" *C");
           }
           // Get humidity event and print its value.
           dht.humidity().getEvent(&event);
           if (isnan(event.relative_humidity)) {u8g2.setFont(u8g2_font_5x7_tf);
           u8g2.setCursor(0,25);
           u8g2.println("Error reading humidity!");
           }
           else {u8g2.setFont(u8g2_font_5x7_tf);
           u8g2.setCursor(0,25);
           u8g2.print("Humidity: ");
           u8g2.print(event.relative_humidity);
           u8g2.println("%");
           }
  }

  for(static unsigned long previousMillis=millis();
      millis()-previousMillis>=screenInterval/4;
      previousMillis=millis()){u8g2.sendBuffer();} 
}