Involvement:Expert (understands the inner workings) - Ownership:more than 1 month
It's mounted to a PCB, has a pull-up resistor. This means less wear-and-tear on the sensor if you move it between projects, and the pull-up means no hunting for the right resistor (OK, that part doesn't take much hunting, but still).
The sensor on here is known to be slow & low accuracy, so it's intended for data-loggers and the like.
There are no specs provided, the build quality is iffy. The first one I got was shorted out, so it just got hot and my computer turned off the USB port to save itself. But, like always, DX replaced it for me with a minimum of fuss.
This is a DHT11 sensor, you can find lots of tutorials online. If you google for adafruit dht11, you'll find a good tutorial with code for using these on arduino.
It's mentioned in the comments, but I'll put it here in case it helps anyone:
The left pin is signal (There is a silk-screened S on the board next to it)
The middle pin is power.
The right pin is ground (There is a silk-screened - on the board next to it)
If you want to play with a temperature or humidity sensor that doesn't need rapid-read times, this is perfect.
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