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The RHT03 (also called DHT22 or AM2302) is a 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.
* Supply voltage: 3.3 – 6VDC * Current (measuring): 1 – 1.5mA * Current (idle): 40 – 50uA * Range (humidity): 0 – 100% RH * Range (temperature): -40 to +80°C * Accuracy (humidity): ±2% RH * Accuracy (temperature): ±0.50°C