// nodemcu
#define D0    16 // high at boot (no PWMm or I2C support)
#define D1    05 // SCL
#define D2    04 // SDA
#define D3    00 // boot failure if pulled LOW
#define D4    02 // high at boot and boot failure if pulled LOW (on-board led)
#define D5    14
#define D6    12
#define D7    13
#define D8    15 // boot failure if pulled HIGH
#define RX    03 // rx pin high at boot
#define TX    01 // tx pin high at boot and boot failure if pulled LOW
#define ADC0  A0 // analogic

#include <OneWire.h>
#include <DallasTemperature.h>

const int ONE_WIRE_BUS = D2;

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensor(&oneWire);
float Celsius = 0;

void setup() {
  Serial.begin(9600);
  
  sensor.begin();
}

void loop() {
  sensor.requestTemperaturesByIndex(0);
  
  Serial.print("Temperature: ");
  Serial.print(sensor.getTempCByIndex(0));
  Serial.println(" C");

  delay(2000);
}