You ordered a few DS18B20 temperature sensors and after a few weeks of waiting, you finally received the shipment. You connected the sensor to your project and ... nothing... Tried again ... nothing.
Where is the bug? Your connection? Bad contact? Your code?

For solving of issue, Petr Stehlík (CZ) developed a smart code which tests your temperature sensor.
He received a lot of sensors which were not working properly hence he spent a time for developing of this "tool".

Schematic and code is available on github https://github.com/joysfera/DS18B20-tester/