#include #include #include #include #include #include #include // Data wire is connected to GPIO 4 #define ONE_WIRE_BUS 12 // Setup a oneWire instance to communicate with any OneWire devices OneWire oneWire(ONE_WIRE_BUS); // Pass our oneWire reference to Dallas Temperature sensor DallasTemperature sensors(&oneWire); // Replace with your network credentials const char* ssid = "YOUR_SSID"; const char* password = "YOUR_PASSWORD"; // Create AsyncWebServer object on port 80 AsyncWebServer server(80); String readDSTemperatureC() { // Call sensors.requestTemperatures() to issue a global temperature and Requests to all devices on the bus sensors.requestTemperatures(); float tempC = sensors.getTempCByIndex(0); if(tempC == -127.00) { Serial.println("Failed to read from DS18B20 sensor"); return "--"; } else { Serial.print("Temperature Celsius: "); Serial.println(tempC); } return String(tempC); } String readDSTemperatureF() { // Call sensors.requestTemperatures() to issue a global temperature and Requests to all devices on the bus sensors.requestTemperatures(); float tempF = sensors.getTempFByIndex(0); if(int(tempF) == -196){ Serial.println("Failed to read from DS18B20 sensor"); return "--"; } else { Serial.print("Temperature Fahrenheit: "); Serial.println(tempF); } return String(tempF); } const char index_html[] PROGMEM = R"rawliteral(

ESP DS18B20 Server

Temperature Celsius %TEMPERATUREC% ^°C

Temperature Fahrenheit %TEMPERATUREF% ^°F

)rawliteral"; // Replaces placeholder with DHT values String processor(const String& var){ //Serial.println(var); if(var == "TEMPERATUREC"){ return readDSTemperatureC(); } else if(var == "TEMPERATUREF"){ return readDSTemperatureF(); } return String(); } void setup(){ // Serial port for debugging purposes Serial.begin(115200); Serial.println(); // Start up the DS18B20 library sensors.begin(); // Connect to Wi-Fi WiFi.begin(ssid, password); Serial.println("Connecting to WiFi"); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(); // Print ESP Local IP Address Serial.println(WiFi.localIP()); // Route for root / web page server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){ request->send_P(200, "text/html", index_html, processor); }); server.on("/temperaturec", HTTP_GET, [](AsyncWebServerRequest *request){ request->send_P(200, "text/plain", readDSTemperatureC().c_str()); }); server.on("/temperaturef", HTTP_GET, [](AsyncWebServerRequest *request){ request->send_P(200, "text/plain", readDSTemperatureF().c_str()); }); // Start server server.begin(); } void loop(){ }