The Feasibility of Low-Cost, Smart Sensing Radar Sensors for Indoor Multi-Functional Switches10/15/2024 There are both contact and non-contact radar sensors for humans to control light switches. The contact ones are touch buttons, touch screens, and touch wireless remote controls. Among them, touch buttons and touch screens require the human body to operate very close to the touch point, and the position is relatively fixed. Touch wireless remote control can be controlled within the range of wireless signals, the human body can not be fixed operating position, but need to carry the remote control. Non-contact are infrared sensors (temperature control), cameras, microphone sensors (voice control), microwave radar sensors, and so on. These sensors do not need to touch the button, and do not need to carry a remote control, only need the human body into the sensor sensing range, you can turn on or off the lights sensorlessly. Contact methods of electric light control, such as dual-control switches, are the most used configurations in modern homes. Bedroom into the door immediately press the first switch to turn on the lights, sleep lying down and then the second switch to turn off the lights, the wiring structure is shown in the figure below: In addition to the bedroom, up and down the stairs, inside and outside the bathroom also exist in this type of installation. The biggest advantage of this approach is that the system structure is simple, stable control, easy to operate, and the user has a strong sense of operation. However, the shortcomings of this way is that multiple lines need to be laid to realize the dual-control function. Non-contact switch control, the use of microwave sensing to achieve a person to light up, people go out of the light function. Thus avoiding the cost of dual-control switches and wiring, but also reduces the user's dependence on the switch, do not need to look for the switch in dark environment where the switch is, and then go to touch it.
The other one is a microwave sensing radar for power connection type, which realizes the de-switching of the electric light, the electric light only needs to be connected to the zero wire and the fire wire, free of wiring, and the integration of the control switch and the electric light. You don't need to worry about the cost of wiring and aging, as you can avoid bad switch wiring, do not need wall grooving. Most of the radar sensor lights are installed in corridors, aisles, and these locations because these locations do not need radar to determine human consciousness, they only need to monitor the presence of a human body. The scene in the bedroom is the presence of people who may not need to turn on the light, and may also need to turn on the light after turning off the light. A switch signal can be triggered by a triggering method, which makes the radar perceive the awareness of human behavior, thus controlling electric lights. By using proximity gesture recognition, the radar from the previous integrated lamp out, respectively, installed in the entrance and bedside, through the gesture to perceive the human body movement, to achieve non-contact control. You can also integrate the near-end gesture perception function into the bedside lamp or make a separate discrete perception module, placed in the bedside, while the light inside the perception of the radar is still retained. When a person enters the room will automatically turn on the light, the person leaves the room will automatically turn off the light. If a person does not need to turn on the light in the room, he or she can wave the sensing module with a gesture, and if a person needs to turn on the light, he or she can also wave the sensing module with a gesture. Of course, the priority for waving the sensing module with a hand gesture will be higher than that inside the electric light. This perception module can not only control lamps, desk lamps, curtains, fans, air conditioners, stereos, TV screens, projectors, sweeping robots, washing machines, and so on, through proximity gesture sensing, to achieve integrated control of smart devices. You only need to define a lot of gestures, and at the same time ensure that each gesture can have a high degree of recognition accuracy. In the past, smart devices could also be controlled by voice or wifi, but radar is also a solution that doesn't require speech and is friendlier to people with speech impediments.
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