from "press" to "Sweep one foot" - Decrypt intelligent toilet laser foot sensation application

A real awkward moment:

the small hours, Half asleep and half awake, you enter the bathroom in the dark, Kick your foot into the trash can, The wet buttons felt by hand; In the public restroom, You tiptoe to avoid getting dirty, But I had to bend down and press the flushing water. These scenes occur globally every day 47 Billion times (Statista, 2024) . among which 62 % User feedback "Worried about cross infection" , 38 % People because "Wrong touch or no response" And give up using the sensing function.

With the rapid development of technology, Smart homes have become inseparable from people's daily lives. so-called "intelligent" It adds many new elements on the basis of tradition "intelligent" function, Allow users to personalize settings according to their usage habits, Enhance the comfort of use.

As one of the core components of smart toilets, The application of induction technology is very important. Although traditional physical buttons or remote controls can meet basic usage requirements, But there are hygiene issues with contact. The application of laser foot sensation technology, turn "light" become "button" , Completely liberate your hands, More hygienic and safe.

one, What is laser foot sensation?

Laser with 940nm Continuous scanning of invisible light, formation 6 mm×20 mm of "light curtain" . When the feet are covered ≥2 A continuous scanning cycle (≈ 60 ms) It is judged as a valid trigger; Chip synchronously records the slope of the change in occlusion area, implement "Sweep through vs stay" Dual instruction. When the detected signal changes conform to the preset foot movement instructions, The chip immediately sends instructions, Perform the corresponding function: Open the lid, Flip the circle, flush, Close the lid, etc.

Laser turned on "Invisible switch" :

• transmitting end: 940 nm Invisible laser, security level IEC-60825-1 Class 1, Continuous power consumption only 0. 3 W
• receiving end: ToF sensor (Time-of-Flight) , each 30 ms Detect the optical path difference once, precision 0. 8 mm
• algorithm layer: Machine learning model differentiation "Swipe your toes over" ( '0. 3 s) and "Foot rest" (' 1. 2 s) , Mistriggering rate '0. 5 %

two, Parameters of laser foot sensor

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picture	project	parameter
	Working Voltage	5V DC
	rated power	0. 1-0. 2W
	Maximum current	38mA
	standby current	5±2mA
	Protection level	IP67
	Operating Temperature	-10~60℃
	Operating Humidity	≤95%RH

three, Comparison of different sensing technology parameters

Due to the extremely thin laser beam, Can precisely define the sensing area, Greatly reduce the probability of accidental contact. Accurately identifying feet in specific areas "Sweep through" or "stay" , Thus achieving differentiation of different functions; At the same time, the laser is not affected by environmental temperature, Light brightness, Influence of heat source, etc, Stability far exceeds that of infrared and other methods.

At midnight, Turn off all the lights, When you step into the bathroom, Feet are at a distance from the toilet 8 cm Gently sweep around  - 0. 22 Seconds later, The cover ring quietly lifts up 75°, noiseless, A soft light automatically lights up 20 % brightness, Look ahead 1. 5 m The safe zone. Zero contact throughout the entire process, Zero accidental touch, Zero bending. from "press" to "Sweep one foot" , Laser foot sensation, Make late night toileting as natural as breathing.