WWZMDiB 5 Pcs DS18B20 Temperature Sensor Probe High-Accuracy Waterproof Equipped with 5 Pcs 4.7K resistors for Arduino Raspberry Pi DIY

Have used these to monitor temperature at various places around the house. Have them wired into an Arduino Mega board with a 3.5 inch TFT display. Been online for 3 years now.

These work great!

These come with the wrong resistor, but otherwise they are accurate. I've compared them to another thermometer I have. Throw away the resistor that it comes with because it's not the right size. I forget right now what size to use, but I think there is another review that tells the size.

They sensors themselves work well. However, they did not come with 4.7k resistors as described; they came with 5.7 ohm resistors. Fortunately, I had some 4.7k and was able to get them working, but be cautious and check them before using.

Overall, this is a good product and I would purchase again. So here's the full story. I'm using 3 of these in 1 Arduino project as a replacement for my original DHT22's. Making this change required adding a 4.7K pull-up resister to the circuit board. In addition, the DS18B20 required that I change temp sensor libraries. The DS18B220 requires that you use the DallasTemperature library, but that's readily available so o no problem there either. Be aware that the resisters shipped with this product are 47K. resisters. But the DS18B20 requires a 4.7K resister. Duh, stupid me. I blindly use the resisters that shipped with it and had problems. Once I replaced them with the proper 4.7K resister, the problems went away. The Good: 1) Running 3 sensors, all next to each other, are at most 0.75 of a degree F of each other. That's within the stated spec. But they usually do better that with the norm being only 0.25 of a degree variation. 2) I like the ling WATER PROOD cable. Ideal for outdoor use. 3) Excellent temperature range. Way better than even the DHT22. The Bad: 1) They're sloooow. To read 3 temp sensors in one pass on different channels can take up to 2 seconds. DHT22's are much faster. 2) You may need to modify your circuit board to add the 4.7k resister that the DHT22 does not need. 3) The special device library is not compatible with the more standard DHT sensor library, so you will need to code accordingly. Overall, this sensor works good and has it's place.

Works with shelly devices

The temp sensors seem fine and read accurately. However, the listing says they include 4.7K resistors but the pack I received had 4.7 ohms resistors. That led to several hours of frustration and time wasted to try and get them working with the wrong resistor.

Used with ESP8266 controller and Arduino environment. Performed as expected with accurate temperature reading