The use of household appliances is an indispensable part of people's busy working life, but there are often phenomena such as people walking away from electricity or forgetting to turn off household appliances, resulting in waste of energy and potential safety hazards. For example, street lights in public stairs, when no one passes by, the lights are always bright, which is a waste of electricity. If the street light can be lit when someone passes by, when the person walks, the street light will be extinguished again, which not only saves energy, but also does not affect normal use.
The energy-saving and environmentally friendly lifestyle theme makes the smart home system even more compelling. The biggest difference between a smart home system and a traditional home system is that it gives all the items in the family "wisdom", enabling them to "spontaneously" and "actively" communicate with the home gateway, communicate with people and realize information interaction. RFID technology can first enable the smart home system to automatically identify and sense household appliances, and then intelligently manage the system to achieve energy-saving self-control.
1, the overall plan
The system is a smart home energy-saving automatic control system with 51 series single-chip microcomputer as the control core and RFID wireless radio frequency technology as the identification means. The system requires personnel to carry the door card into and out of the room. The MCU reads the number and information on the door card to identify whether the guest is the room. If it is not, it will take a photo of it, so it can quickly identify the identity of the thief after the indoors are lost.
Intelligent lighting management system is an important part of this system. When the person in the room leaves the room, each module controlled by the MCU will judge whether there is someone in the room. If there is no one, the power will be cut off; when the room enters the person again, the room will be re-powered. In addition to the traditional functions, the intelligent lighting management system can also sense the illumination of the human body and the surrounding environment to automatically control the switch and dimming of the light, so that "the person comes to light and the person goes out." The lighting adjustment system in intelligent lighting can simulate the change of natural sunlight as needed. Users can feel the seasonal changes from summer to winter, spring to autumn, or even simulate the day by simply touching the switch or the remote control in the hand. Different time periods.
2, system composition
Figure 1 system composition block diagram
The system uses a variety of sensors to collect indoor physical parameters, and then comprehensively judges indoor personnel and environmental conditions through various aspects of information. It avoids the mistakes of someone in the room who has power failure and no power supply in the room. As shown in Figure 1, the system consists of the following parts: 1 infrared sensor. Sensors that use infrared radiation to interact with matter to detect infrared radiation, in most cases, use the electrical effects exhibited by this interaction. 2 sound sensor. It is used to receive sound waves, which cause the electret film to vibrate, resulting in a change in capacitance, and a small voltage corresponding to the change, which is converted and transmitted to a single-chip microcomputer. 3 heat release sensor. The function of the sensor is to convert the heat release signals of various measured objects into electrical signals. 4 RFID sensor. Generally, it includes a radio frequency signal transmitting unit, a high frequency receiving unit and a control unit. 5 micro cameras. Responsible for capturing images, it is small in size and concealed. 6 home appliance controller. It mainly includes various control interfaces and drive circuits with smart home appliances .
The single-chip controller collects information through infrared sensors, sound sensors, and heat-dissipating sensors, and analyzes whether someone is indoors. The infrared sensor is the first layer detection. When someone enters the room, the infrared sensor will sense it. The sound sensor is the second layer detection and the heat release sensor is the third layer detection. The MCU comprehensively analyzes and counts, and then controls the drive circuit to supply power to the home appliance. When a person walks out of the room, the infrared sensor first determines if there is someone in the room, then the sound sensor, and finally the heat release sensor, and only when the three sensors determine that there is no one in the room. When someone enters the room, RFID will detect if you have a room card, and if the room card meets the requirements. If there is a room card and meets the requirements, then the sensor will be tested; otherwise, the person entering the room will be photographed and the security will be turned on. Function, alarm.
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