The AM2303 sensor from Aosong integrates a humidity and temperature sensor. A micro controller can fetch the sample values from the device via a single serial signal line. The measurement resolutions (not accuracy) are 0.1% RH and 0.1 °C. AM2301, DHT21, DHT22, SHT15, SHT11 and SHT10 are probably equivalent products. I have tested the library using an Arduino Pro Micro module. You can download the library here .
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