2pcs DHT22/AM2302 Digital Humidity and Temperature Sensor Module for Arduino Raspberry Pi, Temp Humidity Gauge Monitor Electronic Practice DIY Replace SHT11 SHT15

I used these to make an experimental thermostat for my house. They worked perfectly and I had a great time playing around with the project. They are easy to use and easy to wire. The quality seemed about average for this type of product. They were pretty cheap too!

I bought this to monitor temperature and humidity in a proofing box. I'm using a RPI 4 to read the sensors. I used a python library by Adafruit to take the sensor readings. The schematic on their site (and any other site that comes up when you google this thing) all say to wire it to 3.3v constant power. When its constantly powered it works intermittently. Sometimes it'll run for hours, sometimes it runs for 20 minutes and stops. Powering off the RPI resents the sensor and it'll work again. To fix this, I wired power to GP17 (instead of 3.3 constant), and I turn it high (turn on the power to the pin) take my temperature reading, then turn GP17 back to low (power off). After making this modification, it's been very stable now for weeks on end. All other wiring for it should stay the same.

These use relative humidity, so the humidity readings will vary in relation to temperature. At colder temperatures (in the winter) they will go up to 100% humidity and stay there for the entire season. They also vary by a few degrees, so you'll need to introduce a programmatic offset (just run them all in the same location for a few hours, and the note how much each is off compared to a known good thermometer) But, they are cheap and easy to use with raspberry pi's and esp8266's and so far of the 5 or so I'm using, none have died.

I used this in a temperature controller to sense temperature and humidity in two places inside an incubator. Much more accurate than the DHT11 and uses a very similar communications strategy. Good luck finding an *accurate* English version of the spec sheet however. All of the “translations” from Chinese materially mis-state timing and state information, but a deep Google will lead you to what you need (ie, a properly rewritten spec sheet done by a frustrated hobbiest. Lol). Documentation issues aside, these are good modules and very stable in operation. They do NOT like to be pushed however, so keep the query rate down to about 1 poll every 1.5 to 2 seconds. In most applications this should not be an issue, but know this limitation and expect it. 5/5 stars for performance.

They work well. The only issue is that occasionally you get a bad read, humidity will read around 3000% and the temperature during the same read will be incorrect. In your Python script, just make sure to ignore any humidity readings above 100% and the temperature reading when the humidity is above 100%. Also the first read when you start the script might not be right, but it corrects by the second read. I accidentally fried one of my sensors and Gowoops offered to replace it for me, great customer service!

They are easy to use and wire up and have great built quality but they are crazy inaccurate! I have them sitting side by side and they are off by more than the margin of error of one device. Granted when taking both units margins into account then they technically work but I found this to be rather crazy. I use them to monitor Temp and Humidity in my PETG filament box so I guess the inaccuracy is not a huge deal breaker for me but I was hoping NOT to see such large difference on two items literally in the same packaging. I would definitely buy it again because of the price but if accurate is your game DHT's should not be your game.

These are as accurate as any other thermometer and hygrometer I have in my home. I connected these up to some Raspberry Pi Zeros and set them up in a few rooms in my house where the temperature fluctuates wildly so I could monitor the temperature remotely on my phone. I set up a website that displays the reading from these sensors and sends me text alerts when the temperature or humidity go outside of some defined limits. These are easy to hook up to GPIO pins on a Raspberry Pi, come with all the wires you need to hook them up, and the example code to get this working on an Arduino or Pi linked to in the product description are a great starting point for using them in your own projects.

Only got about a month of use out of these sensors. Both would report humidity of over 3000% occasionally. One of them would stop working and have to be unplugged and re-plugged. Both sensors failed and stopped working all together after only a month of use.