The DHT-22 is a low cost humidity and temperature sensor with a single wire digital interface. The sensor is calibrated and doesn't require extra components so you can get right to measuring relative humidity and temperature.
Raspberry Pi 3 Model B+
The Raspberry Pi 3 Model B+ is the latest product in the Raspberry Pi3 range, boasting a 64-Bit quad core processor running at 1.4GHz, dual band 2.4GHz / 5.0GHz wireless, Bluetooth 4.2/BLE, faster Ethernet and PoE capability via a separate PoE HAT. The dual band wireless comes with modular compliance certification...
A simple mechanical structure, very convenient platform to build upon with 4 DC motors that can be controlled separately. Two levels of acrylic plates to allow for bigger electronics. Very simple assembly.
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