KEYWORDS: Photonic integrated circuits, Frequency conversion, Fire, Control systems, Switches, Fluctuations and noise, Design and modelling, Infrared sensors, Relays, Power supplies
Now many cities and towns have a lot of large shopping malls, shopping malls have a large flow of people, fire prevention and air have high requirements. Not only should there be a good ventilation system to ensure a comfortable environment, but also to consider the needs of fire exhaust and smoke. At present, large and medium-sized shopping malls and underground parking lots are all equipped with blast and air supply systems, which not only bring people a comfortable shopping and leisure environment, but also consume a lot of electricity and energy. The use of PLC control technology and variable-frequency drive speed regulation technology, the transformation of the traditional shopping mall exhaust system, according to the flow of people in the shopping mall to adjust the speed of the wind unit, to achieve multi-stage speed regulation, and can realize the conversion of power frequency switch, and can significantly reduce the consumption of electric energy, to achieve the effect of energy saving.
KEYWORDS: Antennas, Computer security, Data communications, Metals, Error control coding, Control systems, Data modeling, Telecommunications, System on a chip, Safety
In order to strengthen the security of smart lock, a design scheme of plug-in key smart lock with unique identity
authentication ID is proposed. Main control chip uses Bluetooth chip NRF52832, to control two encryption chips
ATSHA204A. The first encryption chip is welded on the smart key and the second encryption chip is welded on the
smart lock cylinder. SHA256 algorithm is used for two-way verification, and through the combination of mechanical
verification and password verification, the lock can be unlocked or configured only if the key and password are paired
successfully, so as to realize double guarantee and high security performance.
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