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Specification
- Power supply range: 3.0v to 5.5v
- Operating temperature range: -55°C to +125°C (-67°F to +257°F
- Accuracy over the range of -10°C to +85°C: ±0.5°C
- Cable length: 1 meter
- Pack of 5pcs
- GOOD SEALING PERFORMANCE: The probe adopts DS18B20 temperature sensor chip and good sealing performance,ensuring his high sensitivity and minimal temperature delay
- Ability to cold storage temperature monitoring and pharmaceutical GMP monitoring systems, environmental monitoring, etc.
- Its probe is made of high quality stainless steel
- Effectively waterproof, moisture-proof and anti-rust
- Output lead: red (VCC), black (GND), yellow (DATA)
Mitch
Reviewed in Canada on January 14, 2025
I installed these in my fridge and freezer to be able to remotely monitor the temps in case of power or compressor failures. I first installed all 5 on the same esp32 and compared the temps and they were all within 0.3-0.7 degrees. My application doesn't require accuracy so I just averaged them out and applied a temperature offset in the coding.
Chris Stephens
Reviewed in the United States on August 18, 2024
Am using for temp sensors in home assistant on a Shelly add-on for a Shelly 1 plus. Have one probe outside, one inside, and another on my hot water heater.Easy and works, cheap, stable, accurate enough, and no battery to deal with.
Mike
Reviewed in the United States on August 30, 2023
Hooked all of them up to an Arduino Nano. Read the 5 unique 64 byte addresses on each. At room temperature, they all read between 72.61 and 73.85 degrees. Is that "accurate"? I guess it depends on your use case. I set all to 12 bit resolution and read them every 5 seconds for several hours. The temperature spread readings and deltas between the five were consistent. Two of the sensors consistently read within .1 degrees of each other, but at the higher end. Two others are also pretty consistent, but in the middle, and one reads about 1.1 degrees lower than the two at the high end. The DS18B20 is generally supposed to be accurate to +- 0.5C which is about +-0.9F. All mine pretty much fall within that window, so I can't really complain. I should have researched more I had hoped for better than +- 0.9F accuracy.Within my code, I'm going to adjust the temperature for each sensor using a "tweak" value, so I can get them all to read about the same temperature. What I haven't tested, is if the delta value is linear across a range of temps.The product description states they are "essentially" waterproof... not sure what that means. The heat shrink tubing that "seals" the wires going into the metal probe doesn't look like it provides a waterproof seal. I would have expected to see sealant or the use of glue lined heat shrink tubing.... unfortunately that is not the case. I'm going to carefully cut off the heat shrink that's on there and see what kind of water proofing is underneath, augment it if needed, then cover with glue lined heat shrink. For now, I would NOT trust that you can submerge these in a liquid.
Brian Bute
Reviewed in Canada on March 15, 2022
Very easy to configure. Simple to use. Great value.
Honest Canuck
Reviewed in Canada on March 5, 2021
This is the second set of these I have purchased, to monitor heat mat temperatures in the seedling room. An Arduino reads from these and uses the information to switch the heat mats on/off under the plant trays. Just a single GPIO line needed to wire up all them (8 in total here). Recommended!
Nick
Reviewed in the United States on March 29, 2021
For me they were very easy to set up. I used the milesburton/DallasTemperature libary which requires the paulstoffregen/OneWire. The example from the library worked fine.My problem requires three sensors so it was nice to discover that all three can share the same Aruino/ESP pin. All three red wires to 5V all three black to ground and all three yellow to my data pin - makes wiring nice and easy. Note the data pin requires a pull up resistor 4k7 or 5k. Just one irrespective of how many devices. The in built pull up is not sufficient. Some users have reported issues if the power supply is noisy so if you get odd readings try adding a capacitor across the power inputEach device has an 8 byte ID. The sample code from the library scans the devices and reports the IDs so you can hard code them for future use and know which sensor you are reading from.On my desk all five reported the same temperature. Of course they could all be off by the same amount but I took it as a good sign. They responded fairly quickly to being held in my hand so I believe the sensor is in good thermal contact with the case. Holding each unit in turn was how I figured out which address went with which sensor.They appear to be well made. Nice long cable and a nicely finished stainless steel case.
rpb
Reviewed in the United Kingdom on September 22, 2019
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BananaBro22
Reviewed in Canada on April 26, 2019
Got 3 of them with a cable about 1m long. I hooked one up to an arduino with LCD pannel and it works great. The other one if hooked up to a Raspberry pi 3 and also works great. All sensors read the same temperature which is good.
Steve in Monterey
Reviewed in the United States on December 16, 2018
We have been using these to monitor and control experimental aquaria. Several of these sensors hung in salt water for several months with no problems. There is just one negative - sometimes there are spurious readings of -127C (probably what you get when the value overflows or the bits are all zeros). I don't think this is exactly a malfunction, because it is probably caused by electromagnetic fields or current leakage from other equipment. Still, it would be nice to have a way to prevent this. Other researchers have seen the same thing. [see edit at the end]Still, we are sticking with these sensors. They are reasonably priced, and seem to have no other problems. If there are a lot of bad values we find the problem equipment and remove it. Otherwise we just have the Arduino sketch ignore the -127 C value and use the most recent reasonable one.Update for geeks only: we are up to 12 of these in use now, some for about 8 months. I did a calibration test with all 12 in the same insulated container of water at about 20 degrees C. The standard deviation among the sensors was 0.11 degrees. Three expensive HOBO loggers had a lower standard deviation (0.03) and indicated 0.35 degrees warmer, but I don't have any evidence that the HOBOs are actually more accurate. At 36 C, the standard deviation for the Gikfun sensors was up to 0.17, but I can't quote a temperature difference because the HOBO logger are very slow and the water was cooling enough to make the HOBO values unreliable.Edit, June 2019. I found the source of most of our sensor errors. We are powering our Arduinos with a 12 V power supply which is apparently very noisy. The Arduino itself tolerates this perfectly, we the problem wasn't obvious. Just putting a big capacitor across the 12 V wires before they go into the Arduino made the errors go away. A proper filter with optimal capacitors and an inductor would be even better.
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