Product Name: KX2027 Pyroelectric Acoustic-Optical Alarm
Product Code: KX2027 Pyroelectric Acoustic-Optical Alarm
Dimensions: Approx. Length 120mm * Width 50mm * Height 160mm
Weight: About 200g
Material: Plastic
Color: Mixed
Is the device powered by batteries: Yes
Packing: 500 pcs
Box Specification: 600*450*550mm

Preface:

In today's society, where children's education is increasingly valued, scientific enlightenment education has gradually become an important topic in the field of education, which is pursued and explored. More and more teachers and parents are beginning to pay attention to cultivating children's scientific literacy from an early age, so that children can develop good personalities and behavioral habits from the beginning. Parent-child interactive crafts can improve the quality of parent-child companionship, improve the relationship between parents and children, and we spend time with our children, without mobile phones, iPads, or televisions, only joy, interaction, and communication. It can cultivate the ability of children to solve problems by themselves. When children encounter problems, they should first see and experience the solution themselves, because parents and teachers solve problems in the process of doing crafts. It can develop children's imagination. In children's world, cars can fly in the sky, and the sun can be green. Playing with DIY crafts can cultivate children's practical ability by using different tools, which fully exercises children's little hands. Brushes, paints, scissors, hot-melt guns, glue"Children are brave to try any tools and to some extent, they are developing different skills. Improving children's self-confidence in the process of handcrafts, we try everything possible together, experience many failures, but we always succeed, which to some extent enhances their self-confidence. Cultivating children's concentration when children explore various tools and handcrafts, they are very focused, and if there is no external disturbance, they can continue to explore.

Objective of the experiment: 1. To understand the concept of pyroelectric sensors; 2. This product focuses on cultivating and exercising children's ability to practice and think, ultimately forming a good habit of independent thinking, and falling in love with scientific exploration. A simple understanding of the circuit

Principle of Application: Pyroelectric sensors are a type of sensor with great potential for applications. They can detect infrared radiation emitted by humans or certain animals and convert it into electrical signals for output, thereby causing a buzzer to sound an alarm or keeping an LED light on continuously. Piezoelectric ceramics, which maintain their polarization state after electro-orientation, are known as spontaneous polarization. Spontaneous polarization decreases with increasing temperature, reaching zero at the Curie point temperature. Therefore, when such materials are exposed to infrared radiation and their temperature increases, the surface charge will decrease, equivalent to releasing some of the charge, hence the term pyroelectric. The released charge can be amplified and converted into a voltage output. This is the working principle of a pyroelectric sensor. When the radiation continues to act on the pyroelectric element, causing the surface charge to reach equilibrium, it will no longer release charge. Therefore, pyroelectric sensors cannot detect constant infrared radiation.

Experimental Cognition: Pyroelectric sensors can detect the changes in infrared energy emitted by the human body in a non-contact form, and convert it into a voltage signal for output. By amplifying the output voltage signal, it can drive various control circuits.

Knowledge Expansion: Pyroelectric sensors, also known as human-body infrared sensors, are widely used in the fields of security alarm systems, visitor notification, and non-contact switches.

Knowledge Extension: The wire connected to the short leg of the buzzer can be cut in the middle, peeled off, and then connected together to serve as a simple switch for the buzzer. If the wire is disconnected, the buzzer will stop sounding.

Safety Warning:

All the accessories in this product are specially designed for student experiments. Please use them under the supervision of teachers and parents to ensure safety! Do not consume any of the products! They are not suitable for children under three years of age. Do not approach fire sources. Before assembling any batteries, please check if the circuit is clear, all parts of the circuit are complete, and all contacts are good. The + on the battery is the positive pole, and - is the negative pole. Be careful during the assembly process, and if glue is used, do not get it in your eyes or on your skin.