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Smart sensors powering smart toilets 2.0 upgrade!


Smart toilet is an intelligent detection and control system that realizes a number of functions, such as toilet traffic, environment monitoring, energy consumption and equipment management, remote operation and maintenance, etc., relying on sensor based IoT technology. It can provide better, efficient, convenient and comfortable services for toilet users.

Using Smart Sensors to help Upgrade Smart Toilets

The use of smart sensors can detect the toilet traffic and remaining squatting space. Both of these data can be displayed on the screen outside the toilet. Users could clearly see the toilet usage of men and women, the third and the infant room. Managers will be provided of the large data to predict traffic density to arrange the cleaning schedule.

smart toilet,smart sensor, LiDAR sensor

1: Display screen in toilet public area

Regarding to the traffic flow and squatting occupancy of toilets, we can improve the accuracy of big data by smart sensors. With the minimal false positives, an upgraded 2.0 version of toilet will definitely enhance the end users’ experience.

smart toilet,squat detection,traffic flow
Figure 2: Squat detection by LiDAR sensor

Performance Comparison of Each Sensor

At present, squatting detection mostly adopts traditional door lock or infrared sensor, and the detection of toilet traffic flow adopts infrared sensor and 3D camera. Now there is a new type of laser sensor with the price gradually tends to the consumption level, can simultaneously achieve squat detection and traffic flow statistics with 99% accuracy. The following table will show you the three sensors’ difference.

Table 1. Overall analysis of three sensors’ performance

TF-Luna LiDAR sensor,sensor

In order to improve the accuracy of squat detection or traffic flow of toilet, it is necessary to select high performance sensors with stable ranging performance and very low false alarm rate. The following three charts are the comparison of several infrared sensors and Benewake TF-Luna LiDAR sensors.

A. Measured Distance (6m, measured distance comparison of black object)

smart toilet,smart sensor

With the "smart toilet, bring people a bright livelihood" toilet revolution progress, the smart public toilet system project will be implemented in more people's lives. In the new or modified municipal, scenic area, highway, airport and so many public toilets occasions, TF-Luna LiDAR sensor can achieve squat detection and traffic statistics without any installation limitation. The infrared sensor generally should be installed within 2m height. (Indoor, without strong ambient light). According to the above chart, when the actual measuring range of the object is 6m, the measured range of the infrared sensor appears to be over range and negative range. But the measured distance of TF-Luna will reach 6m. It means TF-Luna have 3 times range better than infrared sensor. TF-Luna can be installed in the intelligent public toilets with a height of 1-6m in any country.

B. Accuracy of measurement (≤2%, accuracy comparison of black object)

Different height, dressing will influence the measurement result. Black shiny material is one of the most reason to affect the measurement results and reduce accuracy. In the chart above, the measured results of the indoor blackboard are adopted. The horizontal axis is the standard distance, and the vertical axis is the measured error distance. From the data fluctuation, the infrared sensor is usually outside the range of 1.4-1.9m, and the error value begins to fluctuate greatly. The TF-Luna LiDAR has almost no error within the 6m range. Assume a relatively extreme but happens: a children's height is only 1m, the location of the sensor is installed in 2.6m high. The children may move back and forth, body distance measuring range within the scope of 1.9 to 2.1m. On this occasion, the performance of infrared sensors will be lower than TF-Luna LiDAR sensor.

C. Stability of measurement (3m standard blackboard distance measured by each sensor)

smart toilet
Different action will cause the data jump when the sensor measures the same user for many times. This data represent the stability of the sensor. Under the same condition of measuring frequency, (measuring frequency represents the number of analytic sensors per second, typically, the more the higher) in the chart above, TF-Luna LiDAR measurement stability is precise and very stable. The actual distance is at a fixed range of 3m. In addition, the maximum frequency of TF-Luna is 250Hz. When detect very slow and very fast objects, the LiDAR will ensure the high accuracy. Customers can make personalized configuration according to their special needs.

Overall advantage of TF-Luna LiDAR sensor

Key parameters of TF-Luna LiDAR sensor

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