The Automatic Water Dispenser using IR Pair is a hands-on STEM kit that uses infrared sensors to detect hand presence and automatically dispense water without touch. This DIY project helps students learn basic electronics, sensor integration, and automation concepts in a fun and interactive way.
Price : 850
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The Automatic Water Dispenser Using IR Pair circuit is based on readily available IR sensors, comparator IC LM393, and a relay. A photo diode serves as the light intensity detector, while the IC LM393 functions as the comparator. The IR beam continuously falls on the photo diode. When interrupted, the movement is detected, leading to the photo diode stopping conduction and activating the water pump. When the IR beam returns, the photo diode conducts again, and the water pump stays off.
Most IR-based circuits on the market use expensive or complicated sensors, but this IR-based circuit utilizes readily available IR sensors, reducing costs and complexity. The Automatic Water Dispenser Using IR Pair detects interruptions in the IR beam falling on the photo diode and automatically activates the pump. Water flows continuously, indicating the absence of the beam.
The IR sensor works as a beam detector. The desired beam interruption can be achieved by simply placing a hand palm over the sensor. The circuit operates over a 5V DC voltage, which can be supplied via a DC cable.
The circuit operates by turning ON the water pump in the absence of an IR beam. The photo diode, a light-sensitive device, converts light energy into electric energy, activating the water pump. IC LM393 functions as a comparator, with the photo diode output connected to its input. A relay acts as a switch. In normal conditions, when the IR beam falls on the photo diode, the water pump stays off. In case of beam interruption, the pump turns ON, providing water.