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The HC-05 Bluetooth module can connect to other modules in two ways as a master
9V Battery Adapter for the Arduino attaches to a 9V Battery and the other side attached to arduino through barrel connector
when choose other filters we can get blue or green light
Magnetic Door Switch comprises two parts the magnet and a magnetically sensitive switch
Include Camera OV2640 and can support OV7670 camera (not included)
Temperature Humidity Sensor Module (DHT11) Potentiometer (50 KOHM) The HC-05 Bluetooth module canIntroduction : Temperature Humidity Sensor Module (DHT11) can measure temperature from 0C to 50C with 2. 0C accuracy, and humidity from 20 to 80% with 5% accuracy. You can get new data from it once every second. This sensor is pre calibrated and dont require extra components so you can start measuring relative humidity and temperature right away. Connections : Features: Operating Voltage: 3. 5V to 5. 5V. Output: Digital. Temperature Range: 0C to 50C.