Mobile Toilet Circuit Diagram Explanation
The circuit principles related to mobile toilets mainly involve the power supply architecture of mobile public toilets in highway service areas, the circuit of the automatic toilet flushing controller, and the circuit of the smart toilet seat. The following is a detailed explanation of the relevant diagrammatic content:
Power Supply Architecture of Mobile Public Toilets in Highway Service Areas
The power supply for mobile public toilets starts with connecting to a 220V power source. Through an AC-DC module, alternating current is converted into direct current, with common converted voltages being 12V or 24V. The converted direct current supplies power to various devices, including presence/absence indicator signs, ceiling-mounted speakers, exhaust fans, toilet stall human body sensors, lighting fixtures, and smart locks for partition doors. These devices do not operate independently but are connected to a controller via IO signals for centralized control and management. For example, when someone enters a toilet stall, the human body sensor in the stall transmits a signal through the IO interface to the controller. The controller then controls the presence/absence indicator sign to display the corresponding status according to a preset program and may also turn on the lighting fixture.
Circuit of the Automatic Toilet Flushing Controller
The core of this circuit is the use of an NE555 timer circuit and surrounding components to form a pulse signal oscillator with an automatically adjustable duty cycle, enabling timed water release for toilet flushing with different intervals during the day and night. Transformer T, VD1 - VD4, VD5, and C1 form a 12V power supply circuit to provide a stable power source for the entire control circuit. When the power is turned on, C2 charges through R1 and VD6, making pin ② of the IC low and pin ③ high. The solenoid valve is energized to release water, and the charging time of C2 is about 10s, which means the water release time is about 10s. After C2 is fully charged, pin ③ becomes low, VS is cut off, and C2 starts to discharge. During the day with light, the resistance of the photosensitive resistor R2 is 5kΩ, and the discharge time of C2 is 15min; at night without light, R2 becomes 5MΩ, and the discharge time of C2 is 1h. After the discharge is complete, pin ③ of the IC becomes high again, VS is turned on, and the solenoid valve is energized to release water again. This cycle repeats to achieve water-saving toilet flushing. In the diagram, S is a manual control switch that can be used to manually control water release for toilet flushing.
Circuit of the Smart Toilet Seat
The circuit of the electronic toilet seat involves components related to the water circuit, circuit control, mechanisms, and heaters. In the water circuit part, the pressure-stabilizing valve assembly consists of a copper connector, a solenoid valve, and a pressure-stabilizing valve. It is connected to the water inlet pipe and controls the water inflow and stabilizes the output pressure. The flow meter monitors the flow rate and transmits it in the form of pulses to the MCU, which then controls the power of the instant heating component accordingly. The instant heating component is composed of ceramic heating tubes, etc., which heat the cold water and control the water temperature. However, the reference information does not clearly provide a complete circuit diagram but only introduces the composition and functions of each component.
