Smart technology is an integral part of many consumer electronics devices today. In the smart home market , more and more smart homes are beginning to adopt sensors in their designs to achieve advanced sensing and control. Position sensors, proximity sensors, level sensors, flow and speed control sensor technology are used in a wide range of appliances to improve accuracy, reliability and efficiency. Modern smart appliance design requires multiple sensors to be placed in each unit, as shown in Figure 1.
What is driving the application of sensors in the smart home industry ? This article will first discuss the four most important factors, including the use of microprocessor control systems in the design of smart home appliances. Then, the article will list two examples of non-contact sensing technology and explain their impact on smart home appliance design.
Four factors affecting smart home sensor applications
1. The need for consumer convenience and home automation has driven demand for home appliances with smart sensors. As modern homes increasingly rely on smart technology, smart home appliances using advanced sensing technology enable simultaneous communication and control.
2. Demand for energy efficient and low-cost appliances continues to grow throughout the world, including Asia, South America and other continents.
3. Rising energy prices and related government regulations require the use of energy-efficient smart home appliances. The widespread use of sensors in a variety of applications, including smart grids, smart buildings, and smart industrial process control, will help achieve more efficient resource utilization and reduce greenhouse gas emissions. By adopting advanced technologies with built-in energy efficiency, the level of energy and water demand is significantly reduced, while minimizing the corresponding waste of water and electricity.
4. The use of a microprocessor control system reduces the need for large mechanical contactors/relays and switching techniques that traditionally use a few ampere current switch incandescent lamps. Today's smart appliances require low voltage and low current switching/sensing devices. Non-contact sensing devices are an ideal replacement for mechanical devices. The next section will list a few examples and illustrate their use in the appliance market.
Non-contact sensor: reed switch and Hall effect
Reed switches and Hall sensors are non-contact sensing technologies suitable for millions of operating cycles. They are considered to be contactless because the starting device does not require physical contact with the sensor to change the sensor output. Now let's discuss the key details about reed switches and Hall sensors and how they affect today's home appliance design.
Reed switch
A reed switch is an electronic switch that is operated by an applied magnetic field. As a passive device, it does not require any electrical energy to operate. This switch consists of two or three thin metal sheets called reeds with plated contacts on the top with a small gap between them (see Figure 2). The reed is usually sealed in a sealed glass tube filled with an inert gas.
Due to its simple and reliable performance, the reed switch is ideal for low power applications such as smart home appliances. Reed switches are commonly used in refrigerators and oven doors to detect the opening or closing of a door. The sensor signals the control unit to quickly activate or deactivate the LED illumination in the appliance.
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