On October 14, 2021, Dalian General Holdings, a leading semiconductor component distributor dedicated to the Asia-Pacific market, announced that its subsidiary Youshang has launched a social distance sensor based on STMicroelectronics (ST) VL53L1CX time-of-flight sensor solution.

Figure 1 – The display board of Dalian Dayoushang’s social distance sensor solution based on ST products

Now, with the continuous update of the epidemic policies of various countries, the lives of people in all countries have gradually returned to normal from home isolation. However, the new crown pneumonia epidemic has not completely dissipated, and epidemic prevention and control work still occupies an important position in daily life. Among the many prevention and control measures, maintaining social safety distance is one of the best ways to reduce the infection of the new coronavirus. Based on the VL53L1CX time-of-flight sensor launched by ST, the social distancing sensor solution developed by Dalian Dayou can accurately measure the distance, thereby assisting customers to develop innovative infectious disease protection devices to meet the challenges brought by the epidemic.

Figure 2 – Entity diagram of Dalian Dayoushang’s social distance sensor solution based on ST products

The core device of this solution is ST’s low-power VL53L1CX high-power density ToF sensor. The sensor has a maximum detection distance of 4 meters, and has built-in signal processing and crosstalk compensation functions, which not only simplifies the design, but also improves the measurement performance. Normal measurement accuracy is maintained even when the sensor window is blocked by foreign objects.

The ToF sensor utilizes a VCSEL to emit photons, and then calculates the target distance based on the time it takes for the reflected photons to return to the sensor. In addition, the ranging accuracy of the VL53L1CX is not affected by the surface properties of the object, such as the color of the object’s clothing or the reflectance of the skin. This makes it ideal for social distancing sensor solutions.

Figure 3 – Block diagram of Dalian Dayoushang’s social distance sensor solution based on ST products

The social distancing sensor solution for retail counters and checkouts is simple to install and easy to use. Under normal circumstances, the signal light of the device will light up green, and if someone crosses the minimum safe distance, the signal light will change from green to red, and an alarm will be issued. In addition, this solution provides users with the P-NUCLEO-53L1A1 evaluation kit, which makes it easy for anyone to learn and develop end applications using the VL53L1X ToF long-range sensor technology.

Core technical advantages:

  • small size;
  • first-class safety regulations;
  • digital output;
  • non-analog value;
  • High precision.

Program Specifications:

  • Dimensions: L 7.9″ (20cm) – H 10″ (25.5cm) – D 3.9″ (10cm);
  • Angle: 27°;
  • Powered via micro USB (spec output: 5V – 1A);
  • out of the box;
  • Adjustable distance.

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