Smart Eco Speaker (As One Rat Repellent With Ultrasonic Waves from Styrofoam Waste)

This work is the result of research from three students of Junior High Scholl 1 Bungah Gresik namely Alya Yasmin, Venny Izzatur Rohmah and Wilda Sazkia Nuryana, thanks to this they won the 2nd winner in scientific writing competition among junior high school students in East Java in Hidayatus Salam Dukun Gresik in 2016, in this work they studied tetang pest, mice used in the test that is on the type of Rattus Diardi and Hundred Exulans. Testing of this pest is carried out on the test site that has been made and done in a rather dark place. The design of this series has not been tested in the fields directly, only until the test of laboratory rice mice. This is because for testing directly into the field takes a relatively long time.

The resulting speaker is a loudspeaker connected to a smartphone that produces ultrasonic waves with frequencies that can repel mice. Ultrasonic waves are longitudinal mechanical waves with frequencies above 20 kHz. These waves can propagate in solid, liquid and gaseous media, caused by ultrasonic waves constituting energy propagation and mechanical momentum thus propagating as interactions with molecules and the inertial properties of the medium through which they travel. Characteristics of ultrasonic waves through the medium result in vibration of particles with medium amplitude parallel to the longitudinal creep direction causing the particles of medium to form density (Strain) and stress (Stress). The continuous process that causes density and strain in the medium is caused by periodic vibrations of particles during the ultrasonic waves through it. This ultrasonic wave generating device does not disturb humans. Because the frequency generated above the threshold of human hearing, which is above 20 KHz.

The use of styroform speakers can extend the range from only 3 meters without speakers by using the speaker radius reaches up to 10 meters. Although ultrasonic sounds can be used to disrupt and repel pests of rodents in the fields, it remains to be questioned whether the sound produced by the device actually adversely affects the behavior of rats or not. This is because the mice themselves make an ultrasonic sound as a means of communication among themselves.

Certain conditions that reflect this are as follows:
1. The population rate (action for marriage) of female rats will increase after male rats emit ultrasonic sound
2. Female rats will build thicker or closed nests if their children make an ultrasonic sound as a sign of cold.
3. The rats will emit ultrasonic sounds when they get lost, to make it easy for their mothers


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