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paradug
Reviewed in the United States on March 26, 2025
DHT22 humidity / temperature sensors are reliable and very popular with electronic hobbyists. They are a nice step-up from the DHT11 sensor. These modules have the necessary resistors to operate the sensor without adding other parts. They are used with a microprocessor to capture readings. There are numerous tutorials, instructions, libraries, and code examples on the web on how to use the DHT22 sensor.I tested all six sensors of this offering against sensors that I already owned. The results between the sensors in this offering were +/- 1% humidity, all sensors reported the same temperature. Compared to a selection of sensors that I previously owned the humidity readings spread to +/- 2%. Measuring humidity takes a while. You must allow the sensor to adjust to your environment. I suggest taking at least 15 minutes before making a comparison, and it could take longer for things to settle.This is a nice offering of accurate humidity / temperature sensors at a reasonable price.
Robert
Reviewed in the United States on March 20, 2025
This is another of those "if you don't know what it is, you're probablynot reading this" product reviews that I seem to write, probably becauseI'm drawn to terribly nerdy, niche things like this.The DHT11 is a commodity temperature and sensor that's been around fora long time. These are the modules, not just the raw sensor. One resistoris provided for current-limiting on the LED and another pullup betweendata and VDD is present.Datasheets and libraries are plentiful. I looked at code samples forESP-IDF, Arduino, NuttX, STM32, RIOT-OS, MBed, LibDriver, PIC15, ARM,WCH from CH32V003 through CH32V307, and just about anything else youcan imagine. These are very popular parts.DHT11 uses a single wire to communicate both directions, but it'selectrically incompatible with the official Harris 1-Wire® protocol. Asyou might expect from a bidirectional (tristated) signal that's eitherbeing driven high, driven low, or floated as an input from the other side,it's also implicitly clocked, so programming it directly is not a hugeamount of fun, but unless you're on a super obscure part, you won't haveto do this. In short, the host drives the bus low for a long pulse. Itwaits for an acknowledgement from the DHT-11 target. The sensor thensends 40 precisely timed bits, which is five bytes. Integer + decimalrelative humidity. Integer + decimal temperature. Checksum. The timingis finicky, but it's not complicated. The entire Linux dht11 driver isabout 300 lines of code with only about half of that being the actualdriver overhead and the rest holding exclusivity locks and handholdingkernel infrastructure.These arrived just as a cold snap was threatening our pipes in our garage.I attached two to ESP32's and created wireless WiFi logging with alarmsto notify me if we needed to heat the garage. The ESP-IDF drivers wereeasy to find, and attaching the three wires was dead easy. It was convenientthat the module worked reliably from the 3.3V of the ESP32.I'd recommend these as a good "starter iOT" sensor for anyone startingwith about any microcontroller. They're inexpensive. Interfacing themis easy. There are spares in case something goes wrong. It's prettyeasy to visualize whether things work correctly. Experimenting withthings like building web graphs or storing them to a NoSQL vs SQLtable is easy. Of course, if you need to monitor conditions in an attic,crawlspace, garage, barn for your animals, keg for your microbrew, etc.These are good to work with.6 Set DHT11 Temperature Humidity Sensor $9.99
Customer
Reviewed in the United States on March 15, 2025
This review is for 6 Set DHT11 Temperature Humidity Sensor Module Digital Temperature Humidity Sensor 3.3V-5V with Dupont WiresThese are basic DHT11 temperature and humidity sensors. Their accuracy is not spectacular, but will work fine for many uses. The data protocol is a little tricky, but there are libraries for many common platforms. There is a power LED.I was able to make this work on a STM32 platform with some minor difficulties meeting the timing requirements for the signals, due to running a tasking OS and not wanting to disable interrupts. However, the sensor does work and puts out values that are close to measured values using more precise instruments. Pay close attention to the temperature limit of 50C if you were thinking about monitoring an oven or the like. Another caution is to make sure that the sensor never gets any liquids inside. This will permanently affect the accuracy and function of the DHT-11.At $1.67/each, the price is pretty good and having a few will allow you to experiment without fear of blowing one or two up. Learning how the protocol works will give you insight into other instrumentation.Buy some and have fun!
JBerg
Reviewed in the United States on April 22, 2025
The DHT-22 is a staple for smart home environment sensors. Widely supported by your standard microcontrollers libraries for Arduino and Platform.io plus has great support in tools like ESPHome for integration with Home Assistant.This is a nice value package for 6 of these. They come with a nice little case and a three-wire dupont female/female cable for each sensor.The only reason I'm not giving this 5 stars is there was some minor QC issues with mine. Some of the sensors are not soldered on straight. This is a minor cosmetic flaw that can be fixed by bending or re-soldering. But shouldn't have to do that with a new sensor out of the box.
Neuronscream
Reviewed in the United States on April 21, 2025
I used a an ESP32 micro to interface to this and the libraries included in the Arduino IDE. Worked great and I've since added some MQTT functionality to the code to make this into an IoT device. The price is nice and low, so this is one that you can invest in for a STEM class without breaking the budget.All of them worked perfectly out of the box, no duds!
ES
Reviewed in the United States on April 12, 2025
I’ve been using these with ESPHome to use for cheap temperature/relative humidity sensors for my home with Home Assistant.I’ve been able to find them at lower prices elsewhere, but if you want them at your door the next day, this is the way to go.The modules are ready to go and come with cables, so all you need is a microcontroller and the right code tp get it all working.All of the ones in this package were functional, the DHT22’s are a little better than the DHT11’s, but for indoor climate measurements, the DHT11 is good enough.
Kerr
Reviewed in the United States on April 10, 2025
My nephew losed working on arduino stuff, with my help. We got these set up and working easily enough, and he had fun measuring humidity all over the place.
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