The DHT11 Temperature & Humidity Sensor Module is a one-wire sensor module that can be directly plugged into any solder-less breadboard or prototype board. The DHT11 uses a proprietary (or "unique to this device") single-wire protocol, digital output containing both relative humidity and temperature readings. This sensor includes a Resistive-type humidity sensor and a NTC temperature measurement component. It is fully calibrated and is capable of measuring temperature within the range of 0°C to +50°C and humidity from 20% to 90%Rh. It can be use in your Arduino and Picaxe projects. Build your own weather station perhaps?

Features:
Supply Voltage: +5 V
High precision capacitive humidity sensor
Fully temperature compensated
Relative humidity and temperature measurements
Temperature range :0-50 °C error of ± 2 °C
Humidity :20-90% RH ± 5% RH error
small size 12 X 15.5 X 5.5 mm
Response time: <5S
Low power consumption
High reliability
Optimized long-term stability

Pin outs, from left to right

1 : VCC (5V)
2 : Signal
3 : NC Not connected
4 : GND

More info on connecting to Arduino is available here and it also links to a data sheet and the library required to make it work. http://arduino.cc/playground/Main/DHT11Lib

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