On October 14, 2021, Dalian United General Assembly holdings, a leading distributor of semiconductor components committed to the Asia Pacific market, announced that its Youshang launched a social distance sensor solution based on Italian French semiconductor (st) vl53l1cx time of flight sensor.

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Figure 1 – display board diagram of social distance sensor scheme based on St products

Nowadays, with the continuous updating of epidemic policies in various countries, people’s lives in various countries have gradually returned to normal from home isolation. But the novel coronavirus pneumonia has not yet completely dissipated, and epidemic prevention and control work is still playing an important role in daily life. In many prevention and control measures, maintaining social safety distance is one of the best ways to reduce COVID-19 infection. The social distance sensor solution of vl53l1cx time-of-flight sensor based on St launched by the general United Nations and Youshang can accurately measure the distance, so as to help customers develop innovative infectious disease protection devices to meet the challenges brought by the epidemic situation.

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Figure 2 – entity diagram of social distance sensor scheme based on St products

The core device of this scheme is ST’s low-power vl53l1cx high-power density TOF sensor. The maximum detection distance of the sensor is 4m, and the built-in signal processing function and crosstalk compensation function not only simplify the design, but also improve the measurement performance, and maintain the normal measurement accuracy even when the sensor window is blocked by foreign objects.

The TOF sensor uses VCSEL to emit photons, and then calculates the target distance according to the time taken for the reflected photons to return to the sensor. In addition, the ranging accuracy of vl53l1cx is not affected by the surface characteristics of the object, such as the clothing color or skin reflectivity of the ranging object. This makes it an ideal choice for social distance sensor scheme.

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Figure 3 – block diagram of social distance sensor scheme based on St products

The social distance sensor solution is suitable for retail counters and checkout counters, which is very simple to install and easy to use. Under normal conditions, the signal light of the equipment will turn green. If someone crosses the minimum safety distance, the signal light will change from green to red to give an alarm. In addition, this scheme also provides users with p-nuccleo-53l1a1 evaluation suite, which allows anyone to easily use vl53l1x TOF long-distance ranging sensor technology to learn and develop terminal applications.

Core technology advantages:

  • Small size;
  • Class I safety regulations;
  • Digital output;
  • Non analog value;
  • high-precision.

Scheme specification:

  • Dimensions: l 7.9 inches (20 cm) – H 10 inches (25.5 cm) – D 3.9 inches (10 cm);
  • Angle: 27 °;
  • Power supply via micro USB (specification output: 5V – 1A);
  • Out of the box;
  • Adjustable distance.

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