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#include <Wire.h> #include "SSD1306.h" #include "DHT.h" #define DHTPIN D3 #define DHTTYPE DHT11 DHT dht(DHTPIN, DHTTYPE); SSD1306 display(0x3c, 4, 5); int intTemperature = 0; int intHumidity = 0; int firstRun = 1; String lastValidTemp = ""; String lastValidHum = ""; void setup() { display.init(); display.flipScreenVertically(); } void loop() { getDHT(); // reads DHT11 Sensor Data display.clear(); drawDHT(); // show DHT sensor data on OLED display.display(); // Display all in OLED firstRun = 0; } void getDHT() { intTemperature = dht.readTemperature(); intHumidity = dht.readHumidity(); } void drawDHT() { int x = 0; int y = 0; display.setFont(ArialMT_Plain_16); display.setTextAlignment(TEXT_ALIGN_LEFT); display.drawString(30 + x, y, "freeelec.ir"); display.setFont(ArialMT_Plain_10); display.setTextAlignment(TEXT_ALIGN_LEFT); display.drawString(43 + x, 20 + y, "DHT11"); display.setFont(ArialMT_Plain_10); display.setTextAlignment(TEXT_ALIGN_LEFT); display.drawString(0 + x, 25 + y, "Hum"); display.setFont(ArialMT_Plain_24); String humdht22 = String(intHumidity); if (humdht22.length() <= 2) { display.drawString(0 + x, 35 + y, humdht22 + "%"); lastValidHum = humdht22; } else { display.drawString(0 + x, 35 + y, lastValidHum + "%"); } display.setFont(ArialMT_Plain_10); display.setTextAlignment(TEXT_ALIGN_LEFT); display.drawString(95 + x, 25 + y, "Temp"); display.setFont(ArialMT_Plain_24); String tempdht22 = String(intTemperature); if (tempdht22.length() <= 2) { display.drawString(70 + x, 35 + y, tempdht22 + "^C"); lastValidTemp = tempdht22; } else { display.drawString(70 + x, 35 + y, lastValidTemp + "^C"); } } |
