Principle of Intelligent Mobile Toilet

The principle of intelligent mobile toilets mainly covers two core modules: intelligence and water conservation, achieving efficient resource utilization and environmental optimization through technological integration.

Water Conservation Principle

1. Vacuum Negative Pressure Flushing System
   This technology draws on designs from the aviation field, utilizing atmospheric pressure differences to create a negative pressure environment. When a user triggers the flush button, the system quickly sucks the waste from the toilet bowl into the pipeline through a vacuum pump, requiring only 0.5-1 liters of water for cleaning, compared to 6-10 liters for traditional flush toilets per use. This technology significantly reduces water consumption, making it particularly suitable for water-scarce areas or mobile scenarios.

2. Foam Sealing Technology
   By generating dense foam with a small amount of foaming agent to cover the surface of the toilet bowl, a physical seal is formed. The foam effectively blocks odor diffusion while lubricating the pipeline to reduce waste adhesion, requiring almost no additional flushing water. This technology is especially suitable for wild environments without a water supply, requiring only periodic replenishment of the foaming agent to maintain operation.

3. Recycled Water Treatment System
   Using multi-stage filtration and disinfection processes, gray water such as handwashing water and toilet flushing wastewater is collected and treated through sedimentation, activated carbon adsorption, and ultraviolet sterilization to meet reclaimed water standards for reuse in toilet flushing. This system can reduce freshwater intake by more than 60%, with an intelligent monitoring module ensuring water quality safety.

Intelligent Principle

1. Sensor-Based Smart System

   • Human Body Induction Automatic Control: Infrared or microwave sensors detect human presence to automatically open and close the door and initiate the cleaning process after the user leaves the seat. For example, a system based on STM32 uses an HC-SR501 infrared sensor with a response time of less than 0.5 seconds.
   • Environmental Dynamic Monitoring: MQ136 hydrogen sulfide sensors and MQ137 ammonia sensors are deployed to monitor air quality in real-time. When gas concentrations exceed standards, the system automatically activates the ventilation device and triggers deodorant spraying, while alerting maintenance personnel through a buzzer.
   • Intelligent Flushing Strategy: Infrared obstacle avoidance sensors detect toilet usage status, while infrared beam sensors count foot traffic. The system can dynamically adjust the flushing mode based on usage frequency, such as immediate flushing after a single use or timed flushing every 2 minutes, to avoid water waste.

2. Remote Management Platform
   Device operation data is uploaded to the cloud via an ESP8266 Wi-Fi module, allowing managers to view parameters such as toilet usage frequency, remaining water volume, and waste capacity in real-time through a mobile app. The system supports abnormal warning functions, automatically sending notifications when water levels are low or equipment fails, enabling preventive maintenance. For example, a solution based on STM32 uses the MQTT protocol for low-power data transmission, ensuring remote monitoring stability.

This technological system, through interdisciplinary applications, maximizes resource utilization while ensuring hygiene standards, providing a replicable solution for the intelligent upgrading of public facilities.