How Do Automatic Flush Toilets Work

These days, people seem more worried about cleanliness and hygiene before a health emergency. People face much trouble while using the toilet, especially in public areas. However, each of us wants to come out stress-free and clean after using the toilet, whether it’s a public toilet or our one. 

That’s why modern technology has been included in the form of Automatic toilets. These toilets work magically and allow you to leave the space peacefully and without being frustrated. But how does this happens?

Automatic flushing toilets use a sensor to detect when someone has used the toilet and needs to be emptied. The toilet then fills with water, pushes down on the waste, and then releases the water to flush it all down. This process is repeated until the tank is empty.

What Is Automatic Toilet?

To understand how to do automatic flush toilets work, you must first be aware of what an automatic toilet is. To make it easy, I am giving you a straightforward definition of the automatic toilet.

An automatic toilet is a type of toilet that requires no user input. Instead, the toilet uses sensors to determine when someone has sat down and finished using the toilet. This type of toilet is usually found in public places such as restaurants or airports.

What Is Automatic Toilet Flusher? 

An automatic toilet flusher is a nifty invention that helps to save time and prevent accidents. It’s typically found on standard toilets and uses a sensor to detect when the user has sat down. Once activated, the flusher will flush the toilet automatically, preventing any unwanted messes from happening.

In other words, automatic toilet flushers are a type of device that helps clean the flush mechanism in a toilet. They work by sensing when someone has used the toilet and automatically activating the flush mechanism. This can help to keep the bathroom cleaner and more organized.

To learn more about an automatic toilet, read our blog on how to flush automatic toilet.

Key Components Of Automatic Toilet Flusher

To ensure you understand the inner workings of the automatic toilets, we will begin by explaining the basics of how it works. You will know how they work soon after in this post. An automatic toilet flusher has four key components whose names and functions we are discussing below.

Infrared Sensor

An infrared sensor is one of the critical parts of an automatic toilet. The sensor provides feedback to a toilet’s visualization and process as follows: When an excerpt of a person or object is detected in the cams, it activates the releasing and halting of the valve as the latter operates. 

To that end, there are two infrared LEDs inside the sensor, one LED emits infrared beams into the passage, and the other receives them.

Usually, the sensor eye is likely to the surface of the metallic faceplate. Most faceplates are fabricated from stainless steel, but some may be made of more inexpensive plastic. For certain products, the sensor is integrated into the toilet seat. It appears clearly in the photo on the left.

Solenoid Valve

The second most vital essential part of an auto toilet is the Solenoid valve. The valve at the top of the flush tank is like a switch to open and close water flow to the toilet. The valve opens or closes the water flow when it receives a signal.

Depending on the signal from the sensor (positive or negative), the solenoid valve will either open or close. The polarity of the signal dictates whether the solenoid valve will engage a pull or a push action. The solenoid valve controls the water flow through a rubber disc.

When the flush valve is not active, the valve is automatically closed, so no water passes through it. The flush sends a signal to the solenoid, causing it to open the water valve to permit water flow.

Power Source

The third essential part is the Power source. As a secure backup power supply, the electrical power source is also essential to stock the electronic parts with power. Usually, there are three types, DC battery, AC power supply, and combined AC DC type. 

AC battery power, normally 6V 4xAA or 3V 2XAA alkaline batteries. Battery replacement is easy to do. Open the battery case and replace the used alkaline batteries in the case.

On one side of the adapter, there is one sliding power cord, and the other side has a waterproof connector. When you connect the adapter to the toilet, there is a power transformer inside the adapter. 

The input of this power adapter is 110-380 while also having an output from 6 to 9 volts. This adapter is affordable, and you often purchase it separately.

Waterproof Connector Cables

As one of many vital parts, waterproof connector cables connect every subpart, like a bridge to connect a sensor with a solenoid valve and power battery or AC Adapter. 

Moreover, it must also be taken into consideration that the electronic control system and each electrical component should have exceptionally high requirements due to the humidity of your bathroom and toilet.

KEGE designs and develops anti-plug water-proof connector cables to fix an issue. It enhances the stability and security of the whole system, enhancing the reliability and lifespan of the touchless faucets, automatic urinal flusher, automatic toilet flusher, and so on. Even more, the cable’s waterproof class is ip67.

For more detailed information about how to flush automatic toilet read our blog

How To Flush Automatic Toilet 

How Do Automatic Toilets Know When To Flush

Well, I am pretty sure that, just like me, many people think or wonder how automatic toilets know when to flush? Do I get you? There is no need to be embarrassed. Here is the simple answer to this childish but vital thought.

The process of automatic flushing is an important safety feature on many toilets. When the toilet is turned on, it needs to initialize its flush cycle. This process checks to see if any objects in the toilet bowl could block the flow of water and cause a clog. 

If there are no obstructions, the toilet will begin its regular flush cycle. However, if there are any objects in the bowl, the toilet will automatically flush after a set amount of time has passed. This ensures that all objects have been removed and water can flow freely through the system.

How Do Automatic Flush Toilets Work

Now when you have a lot of knowledge about the critical components of an automatic toilet and their functions. So it will be easy for you to understand how automatic flush toilets work magically.

  • Infrared LEDs (light-emitting diodes) and detectors like those on the TV remote compose infrared sensors. These sensors pick up infrared light from users and the secret when it has reflected.
  • The sensor position will send an electrical pulse to the solenoid valve to allow it to open.
  • The program is designed and run by a microchip. 9s into the Normal Mode, catchphrase Flush; lasting duration 4s throughout Water Saving Mode, usage lasts less than 1min; in Full Mode, it starts to flush less than 1min; with greater than 1min, does it take more than 9s to start the flush.


In conclusion, automatic flush toilets use a sensor to determine when someone is trying to use the toilet and then flush the toilet automatically. This prevents waste from accumulating in the tank and helps to maintain cleanliness.

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