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IR Sensor Sharp GP2Y0A21YK (10 - 80cm)

This little unit uses a beam of infrared light to reflect off an object to measure its distance. Because it uses beam triangulation to calculate distance, it is able to provide consistent and reliable readings which are less sensitive to temperature variation or the object’s reflectivity. The sensor outputs an analog voltage corresponding to the distance of the object, easily read by an Arduino, PIC, PI, or any other ADC chip.

PIR Infrared Motion Sensor HC-SR501

These little modules are perfect for robotics or any other motion sensing application. Distance and delay time can both be set using the adjustment screws on the side of the device.

Temperature Humidity Sensor DHT22/AM2302

This temperature humidity sensor uses a capacitive humidity sensor, and a thermistor to measure the surrounding air temperature. The result is available via a digital signal on the data pin. Compared to the DHT11, this sensor is more precise, more accurate and works in a bigger range of temperature/humidity.