Traditional Chinese Practical Automatic flushing water saver: Circuit Design, Parts List & Workshop Prototype Guide

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Public toilet automatic flushing water saverThe cleanliness of public toilets is a symbol of urban civilization and hygiene. In order to solve the problem of flushing public toilets, one is to have special cleaning workers clean the toilets, and the other is to use constant flow of water for flushing. No matter whether there is feces or not, the flow of water is always uninterrupted, which undoubtedly contributes to the waste of water resources. The automatic flushing water-saving device for public toilets introduced in this article is not photoelectrically controlled, so it does not consume electricity at ordinary times. Its characteristic is that the flushing of the toilet is fully automatically controlled and does not use a scheduled flushing method, but monitors people. That is, when someone uses the toilet, the toilet will be flushed after a certain period of time after the person has finished using it, and then it will automatically stop for the next use. This is not only convenient to use, but also keeps the toilet clean, and will not splash people's clothes and shoes.1． How the circuit worksThe automatic flushing and water-saving device circuit of a public toilet is shown in Figure 51-1. Figure 51-1When no one is using the toilet, the squat switch K is not stepped on, the (16) pin of the IC is at high level, the relay J is not activated, and the entire circuit is in a static state. When someone uses the toilet and squats on the urinal, K is stepped on, K1 is turned on, K2 is turned off, and the power supply charges the capacitor C1 through the resistor R1. At this time, since KC2 is disconnected, although the charge on C1 has been charged to the power supply voltage, it still cannot be discharged outward. That is, when someone uses the toilet, no matter how long it takes, the toilet will not be flushed. When the person using the toilet leaves the squatting position, K1 is opened, K2 is closed, capacitor C1 charges capacitor C3 through potentiometer W, and the delay time begins.When the voltage on C3 is charged to the IC pin ① trigger voltage, IC is set, pin (16) outputs low level, relay J is energized and released, the normally open contact J1 on it is closed, the power of the solenoid valve is turned on, the solenoid valve operates, and water starts to be released to flush the toilet. When the toilet is flushed, that is, the charge on C1 is completely discharged through the IC pin ① and the discharge resistor R2, the potential of pin ① becomes low, and the (16) pin of the IC turns to high level, causing the relay J to be released, the normally open contact J1 is disconnected, the power supply of the solenoid valve DF is cut off, and the water discharge is stopped.2. Component selection and production …

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