describe:
<br /> /**
<br /> * BME280-OLED
<br /> * 
<br /> * By: Mike Klepper
<br /> * Date: 31 March 2017
<br /> * 
<br /> * This program reads data from the BMP280 and shows it on a 
<br /> * SSD1306 OLED display. It will alternte between British and 
<br /> * metric units.
<br /> * 
<br /> * See blog post on patriot-geek.blogspot.com 
<br /> * for connections.
<br /> */
<br />
<br />#include "Wire.h"
<br />#include "Adafruit_Sensor.h"
<br />#include "Adafruit_BME280.h"
<br />#include "SSD1306.h"
<br />
<br />const float SEA_LEVEL_PRESSURE_HPA = 1013.25;
<br />const int DELAY = 3000;
<br />const int STARTUP_DELAY = 500;
<br />
<br />
<br />Adafruit_BME280 bme;
<br />
<br />SSD1306 display(0x3c, 5.4);
<br />
<br />void setup() 
<br />{
<br />  Serial.begin(115200);
<br />  
<br />  if(!bme.begin())
<br />  {
<br />    Serial.println("Could not find a valid BME280 sensor, check wiring!");
<br />    while (1)
<br />    {
<br />        yield();
<br />        delay(DELAY);
<br />    }
<br />  }
<br />  delay(STARTUP_DELAY);
<br />
<br />  display.init();
<br />  display.flipScreenVertically();
<br />
<br />}
<br />
<br />void loop() 
<br />{
<br />  float tempC = bme.readTemperature();
<br />  float humidity = bme.readHumidity();
<br />  float pressurePascals = bme.readPressure();
<br />
<br />  // Print to serial monitor
<br />  printToSerial(tempC, humidity, pressurePascals);
<br />
<br />  // Display data on screen in British units
<br />  drawWithBritishUnits(tempC, humidity, pressurePascals);
<br />  yield();
<br />  delay(DELAY);
<br />
<br />  // Display data on screen in metric units
<br />  drawWithMetricUnits(tempC, humidity, pressurePascals);
<br />  yield();
<br />  delay(DELAY);
<br />}
<br />
<br />
<br />void drawWithBritishUnits(float tempC, float humidity, float pressurePascals)
<br />{
<br />  float tempF = 9.0/5.0 * tempC + 32.0;
<br />  float pressureInchesOfMercury = 0.000295299830714 * pressurePascals;
<br />  
<br />  display.clear();
<br />  
<br />  display.drawRect(0, 0, DISPLAY_WIDTH, DISPLAY_HEIGHT);
<br />  
<br />  display.setFont(ArialMT_Plain_16);
<br />  display.drawString(35, 3, "BME280");
<br />  
<br />  display.setFont(ArialMT_Plain_10);
<br />  display.drawString(5, 22, "Temperature = " + String(tempF) + " *F");
<br />  display.drawString(5, 35, "Humidity = " + String(humidity) + "%");
<br />  display.drawString(5, 48, "Pressure = " + String(pressureInchesOfMercury) + " inHg");
<br />  
<br />  display.display();
<br />}
<br />
<br />void drawWithMetricUnits(float tempC, float humidity, float pressurePascals)
<br />{
<br />  float pressureHectoPascals = pressurePascals / 100.0;
<br />  
<br />  display.clear();
<br />  
<br />  display.drawRect(0, 0, DISPLAY_WIDTH, DISPLAY_HEIGHT);
<br />  
<br />  display.setFont(ArialMT_Plain_16);
<br />  display.drawString(35, 3, "BME280");
<br />  
<br />  display.setFont(ArialMT_Plain_10);
<br />  display.drawString(5, 22, "Temperature = " + String(tempC) + " *C");
<br />  display.drawString(5, 35, "Humidity = " + String(humidity) + "%");
<br />  display.drawString(5, 48, "Pressure = " + String(pressureHectoPascals) + " h,Pa");
<br />  
<br />  display.display();
<br />}
<br />
<br />void printToSerial(float tempC, float humidity, float pressurePascals)
<br />{
<br />    // Temperature
<br />    float tempF = 9.0/5.0 * tempC + 32.0;
<br />
<br />    Serial.println("Temperature:");
<br />    printValueAndUnits(tempC, "*C");
<br />    printValueAndUnits(tempF, "*F");
<br />    //printValueAndUnits(tempC, "°C");
<br />    //printValueAndUnits(tempF, "°F");
<br />    Serial.println("");
<br />
<br />    // Barometric pressure
<br />    float pressureHectoPascals = pressurePascals / 100.0;
<br />    float pressureInchesOfMercury = 0.000295299830714 * pressurePascals;
<br />
<br />    Serial.println("Pressure:");
<br />    printValueAndUnits(pressurePascals, "Pa");
<br />    printValueAndUnits(pressureHectoPascals, "hPa");
<br />    printValueAndUnits(pressureInchesOfMercury, "inHg");
<br />    Serial.println("");
<br />
<br />    // Humidity
<br />    Serial.println("Humidity:");
<br />    printValueAndUnits(humidity, "%");
<br />    Serial.println("");
<br />
<br />    // Approximate altitude
<br />    float altitudeMeters = bme.readAltitude(SEA_LEVEL_PRESSURE_HPA);
<br />    float altitudeFeet = 3.28 * altitudeMeters;
<br />    
<br />    Serial.println("Approx. Altitude:");
<br />    printValueAndUnits(altitudeMeters, "m");
<br />    printValueAndUnits(altitudeFeet, "ft");
<br />    Serial.println();
<br />}
<br />
<br />void printValueAndUnits(float value, String units)
<br />{
<br />    Serial.print("     ");
<br />    Serial.print(value);
<br />    Serial.print(" ");
<br />    Serial.println(units);
<br />}<p> <b><b><img src="https://contestimg.wish.com/api/webimage/599f8d552afd352b941a81c2-large.jpg"><img src="https://contestimg.wish.com/api/webimage/599f8d552afd352b941a81c2-1-large.jpg"><img src="https://contestimg.wish.com/api/webimage/599f8d552afd352b941a81c2-2-large.jpg"><img src="https://contestimg.wish.com/api/webimage/599f8d552afd352b941a81c2-3-large.jpg"><img src="https://contestimg.wish.com/api/webimage/599f8d552afd352b941a81c2-4-large.jpg></b></b></p>