#include #include #include #include #include #include const char* ssid = "********"; const char* password = "&&&&&&&&"; #define ONE_WIRE_BUS 4 OneWire oneWire(ONE_WIRE_BUS); DallasTemperature sensors(&oneWire); LiquidCrystal_I2C lcd(0x27, 16, 2); WebServer server(80); float temperatureC = 0; String getCondition(float temp) { if(temp >= 36.1 && temp <= 37.2) return "Human Body Temperature"; else if(temp >= 20 && temp <= 26) return "Ideal Room Temperature"; else if(temp >= 10 && temp <= 25) return "Drinking Water Range"; else if(temp >= 1 && temp <= 5) return "Cold Drink Temperature"; else if(temp >= 1 && temp <= 4) return "Milk Storage Range"; else if(temp >= 2 && temp <= 5) return "Refrigerator Temperature"; else if(temp >= 22 && temp <= 28) return "Fish Tank Temperature"; else if(temp >= 18 && temp <= 24) return "Baby Room Temperature"; else if(temp >= 18 && temp <= 30) return "Greenhouse Temperature"; else if(temp >= 18 && temp <= 27) return "Computer Room Temperature"; return "General Temperature"; } // Web Page String webpage() { String condition = getCondition(temperatureC); String page; page += ""; page += ""; page += ""; page += ""; page += ""; page += ""; page += "Smart Thermometer"; page += ""; page += ""; page += ""; page += "
"; page += "

🌡 Smart Thermometer

"; page += "
"; page += String(temperatureC,1); page += " °C"; page += "
"; page += "

ESP32 IP

"; page += "

"; page += WiFi.localIP().toString(); page += "

"; page += "
"; page += "Current Analysis:
"; page += condition; page += "
"; page += "

Daily Temperature Reference

"; page += ""; page += ""; page += ""; page += ""; page += ""; page += ""; page += ""; page += ""; page += ""; page += ""; page += ""; page += ""; page += ""; page += ""; page += ""; page += ""; page += ""; page += ""; page += "
ItemMinimumMaximum
Human Body36.1°C37.2°C
Room Temperature20°C26°C
Drinking Water10°C25°C
Cold Drink1°C5°C
Milk Storage1°C4°C
Refrigerator2°C5°C
Freezer-18°C-15°C
Baby Room20°C24°C
Fish Tank22°C28°C
Greenhouse18°C30°C
Computer Room18°C27°C
Server Room18°C24°C
"; page += "

Made with ESP32 + DS18B20 + LCD

"; page += "
"; page += ""; page += ""; return page; } void handleRoot() { server.send(200, "text/html", webpage()); } void setup() { Serial.begin(115200); Wire.begin(21,22); lcd.init(); lcd.backlight(); lcd.setCursor(0,0); lcd.print("Smart Thermo"); lcd.setCursor(0,1); lcd.print("Starting..."); sensors.begin(); WiFi.begin(ssid, password); lcd.clear(); lcd.print("Connecting WiFi"); while(WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(); Serial.println("Connected"); Serial.println(WiFi.localIP()); lcd.clear(); lcd.setCursor(0,0); lcd.print("WiFi Connected"); lcd.setCursor(0,1); lcd.print(WiFi.localIP()); server.on("/", handleRoot); server.begin(); delay(3000); } void loop() { server.handleClient(); sensors.requestTemperatures(); temperatureC = sensors.getTempCByIndex(0); if(temperatureC == DEVICE_DISCONNECTED_C) { lcd.setCursor(0,0); lcd.print("Sensor Error "); lcd.setCursor(0,1); lcd.print("Check Wiring "); delay(1000); return; } Serial.print("Temperature: "); Serial.println(temperatureC); lcd.setCursor(0,0); lcd.print("Temp:"); lcd.print(temperatureC,1); lcd.print((char)223); lcd.print("C "); lcd.setCursor(0,1); lcd.print("IP:"); lcd.print(WiFi.localIP()); lcd.print(" "); delay(2000); }