#include < OneWire.h >
#include < DallasTemperature.h >
// Data wire is connected to GPIO 4 (D2 on NodeMCU)
#define ONE_WIRE_BUS 4
// Setup a oneWire instance
OneWire oneWire(ONE_WIRE_BUS);
// Pass oneWire reference to DallasTemperature library
DallasTemperature sensors(& oneWire);
void setup() {
Serial.begin(115200);
sensors.begin();
Serial.println("DS18B20 Temperature Sensor Ready");
}
void loop() {
sensors.requestTemperatures(); // Request temperature from the sensor
float tempC = sensors.getTempCByIndex(0); // Get temperature in Celsius