1. Feature & Application: * Full range temperature compensated * Relative humidity and temperature measurement * Calibrated digital signal *Outstanding long-term stability *Extra components not needed * Long transmission distance * Low power consumption *4 pins packaged and fully interchangeable 2. Description: DHT22 output calibrated digital signal. It utilizes exclusive digital-signal-collecting-technique and humidity sensing technology, assuring its reliability and stability.Its sensing elements is connected with 8-bit single-chip computer. Every sensor of this model is temperature compensated and calibrated in accurate calibration chamber and the calibration-coefficient is saved in type of program in OTP memory, when the sensor is detecting, it will cite coefficient from memory. Small size & low consumption & long transmission distance(20m) enable DHT22 to be suited in all kinds of harsh application occasions.

The AM2302 is a wired version of the DHT22, in a large plastic body. It 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).

Specifications: Working voltage: 5V Channel: 8 channel Item size: 13.4x5.3x1.7cm / 5.28x2.09x0.67in Item weight: 116g / 4.11oz Package weight: 118g / 4.17oz

6-channel relay module optocoupler protection with low trigger

This is an elegant and innovative protective case designed specifically for the Raspberry Pi 2 Model B. Based on the best-selling SB Components' Model B case this two-piece injection-molded ABS enclosure incorporates snap-fit mounting points that hold the Pi securely in place. It provides tough protection for the Raspberry Pi Model B along with access to all the PI consumer ports as well as DSI, camera and GPIO connectors.