The DHT11 is a basic, low cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and spits out a digital signal on the data pin (no analog input pins needed). Its fairly simple to use, but requires careful timing to grab data.
DHT11 is a single wire digital humidity and temperature sensor, which provides humidity and temperature values serially with one-wire protocol.
DHT11 sensor provides relative humidity value in percentage (20 to 90% RH) and temperature values in degree Celsius (0 to 50 °C).
DHT11 sensor uses resistive humidity measurement component, and NTC temperature measurement component.
Specification
Power supply: 3.3 to 5V DC
Current consumption: max 2.5mA
Operating range: 20-80% RH, 0-50°C
Humidity measurement range: 20-90% RH
Humidity measurement accuracy: ±5% RH
Temperature measurement range: 0-50°C
Temperature measurement accuracy: ±2°C
Response time: 1s
Sampling rate: 1Hz (1 sample per second)
Data output format: single-bus digital signal
Data transmission distance: 20-30m (at open air)
Dimensions: 15mm x 12mm x 5.5mm
Weight: 2.5g
Digital signal transmission protocol: 1 start signal + 40bit data + 1 checksum
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