DS18B20U shows -37 degrees at room +24

Projects Programming
9

@antons15
Thry the following sketch which does functional check on a DS18B20 temperature sensor.

//12-bit default resolution; external power supply
#include<OneWire.h>
OneWire ds(23);  //IO Pin-23 with which the data line of the senosr is connected.
byte addr[8];         //to hold 64-bit ROM Codes of DS1
byte data[9];        //buffer to hold data coming from DS18B20

void setup() 
{
  Serial.begin(9600);
  ds.reset();
  ds.search(addr);  //collect 64-bit ROM code from sensor 
}

void loop()
{
 //----------------------------
 ds.reset();       //bring 1-Wire into idle state
 ds.select(addr); //slect with DS18B20 sensor with address in addr[] array
 ds.write(0x44);    //conversion command
 delay(1000);   //insert max conversion time or poll status word
 //---------------------------
 ds.reset();
 ds.select(addr);  //selectimg the desired DS18B20
 ds.write(0xBE);    //Function command to read Scratchpad Memory (9-byte)
 ds.read_bytes(data, 9); //data comes from DS and are saved into buffer data[]
 //---------------------------------
  int16_t raw = (data[1] << 8) | data[0]; //---data[0] and data[1] contains temperature data : 12-bit resolution-----
  float myTemp = (float)raw / 16.0;  //12-bit resolution
  Serial.println(myTemp, 2);  //show two-digit after decimal point
}