The DS18B20 is an electronic thermometer which has a high accuracy. Multiple thermometers can be connected on the same wire because every one has it’s own internal address. The DS18B20 digital thermometer provides 9-bit to 12-bit Celsius temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points.


  • Temperature range: -55°C to +125°C
  • Designed for : -10°C to +85°C (+- 0.5°C)
  • Unique 1-Wire Interface Requires Only One Port Pin for Communication.
  • Programmable Resolution from 9 Bits to 12 Bits
  • TO-92 Package
  • 3 – 5.5V DC Supply Voltage

My version is a copy from the original Dallas version but it will still work with the Arduino Dallas 1 wire library. ( manufacturer 7Q-TEK )

Read more about the fake, counterfeit or clone DS18B20 sensors here.

…unless you bought the chips directly from Maxim Integrated (or Dallas Semiconductor in the old days), an authorized distributor (DigiKey, RS, Farnell, Mouser, etc.), or a big retailer, or you took exceptionally good care purchasing waterproofed DS18B20 probes. We bought over 1000 “waterproof” probes or bare chips from more than 70 different vendors on ebay, AliExpress, and online stores -big and small- in 2019. All of the probes bought on ebay and AliExpress contained counterfeit DS18B20 sensors, and almost all sensors bought on those two sites were counterfeit.

Author: Chris Petrich, 10 Sep 2020. License: CC BY. Source: https://github.com/cpetrich/counterfeit_DS18B20/
A bit dirty…

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