DS18B20 uses 1-wire protocol and needs only two wires, ground and data. Easy to communicate from Arduino (examples can be found at arduino website).

Weather board consist of SCP1000 barometric pressure sensor, TEMT6000 ambient light sensor, sensitive SHT15 humidity sensor, directly readable over USB. You can immediately tell what the current pressure, humidity, ambient light level, and temperature is. Graphed over time you can watch weather fronts move in and the rain come down.

ePIR is a motion detecting infrared sensor with MCU and serial interface.

super high-performance version of the easy-to-use sonar range finder from Maxbotix. This small range finder is high quality, and easy to use. The sensor provides very accurate readings from 0 to 765cm (0 to 25.1ft) with 1cm resolution.

Colour light sensor with evaluation board that provides all the necessary support circuitry to actually play with the sensor.

DS18B20P uses 1-wire protocol and needs only two wires, ground and data. Easy to communicate from Arduino (examples can be found at arduino website).

The RHT03 (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.

This is a simple breakout board for the BMP085 high-precision, low-power barometric pressure sensor. The BMP085 offers a measuring range of 300 to 1100 hPa with an absolute accuracy of down to 0.03 hPa.

This is a three axis accelerometer for the LilyPad system. Based on the ADXL335 accelerometer from Analog Devices, the LilyPad Accelerometer can detect joint movement as well as inclination and vibration. Dimensions: 20mm outer diameter and 0,8mm thin PCB.