Ultra-Pester: Ultrasonic Generating Pester Device Against Mosquitoes

Ultra-Pester: Ultrasonic Generating Pester Device Against Mosquitoes

An Investigatory Project

Presented by:

Hillaenna Heart D. Delmo

Bansud National High School

Regional Science High School for MIMAROPA

Pag-asa, Bansud

Table of Contents

I.        Title page

II.        Table of Contents

III.         Abstract

IV.        Research Plan

        A. Question/Problem

        B. Goals/Hypppooothesis

        C. Procedure

        D. Biliography

V.        Introduction

        A. Background of the study

        B. Statement of  the problem

        C. Significance of the study

        D. Scope and Limitations

VI.        Methodology

VII.        Results and Discusion

VIII.        Conclusions

X.        References

XI.         Appendix

Abstract

This study was conducted to explore the possibility of repelling mosquitoes using ultrasonic sound. Specifically, it sought to find the effective ness of the experimental battery operated mosquito pester in terms of time to repel mosquitoes and the range of the ultrasonic sound in three trials using a transparent container with mosquitoes inside, room with a parameter of  3 by 4 meters and an open space. These variables were analyzed using critical observation. Likewise, acceptability of the experimental device’s physical properties in terms of convenience to use and portability was also measured using the weighted arithmetic mean. The cost effectiveness was also measured using the cost-effectiveness analysis. the experimental mosquito pester was constructed using circuit to produce ultrasonic sound, operated by  9volts. Other materials and equipment used were 2 piece resistors (2.7k), 2 piece Capacitors(0.01 F), NE 555 timer, IC diode (1N4007), transducer, plastic ware, soldering iron, prototyping PCB, Battery clip, SPST ( single pole, single throw) switch, thin wirings, ferric chloride and masking tape. The mosquito repellant circuit generated an ultrasonic sound with high output frequency using the transducer. The electronic mosquito repellant using the 555 timer IC. The oscillation frequency is given by the value of resistors and capacitor components. Results led the researcher to conclude that the experimental mosquito pester using ultrasonic sound is effective in repelling mosquitoes in terms of time to repel mosquitoes and the range of ultrasonic sound in three trials although the findings may vary in time and range. Likewise, the experimental device is convenient to use and very much portable.

Research Plan

A. Rationale

                Today, there are many known carriers of virus. One of these are mosquitoes. There are more than 3,000 species of mosquitoes nut three bear primary responsible for the spread of human diseases. One of which is the Anopheles Mosquitoes which is a known carrier of Malaria. Another is the Celux mosquitoes carrier of encephalitis, filariasis and West Nile Virus. And of course, the Aedes mosquito which is known to be threatening carrier of yellow fever, dengue, encephalitis and recently the chikungunya, (National Geographic, 2014).

        With this, the current research study wants to help in preventing the spread of these diseases by devising a portable and affordable electronic mosquito pester without posting any threat to human’s health since it will be developed using the ultrasonic sound.

B. Statement of the Problem

        This research aimed to construct a battery operated mosquito pester using ultrasonic sound.  Specifically, it sought to answer the following questions:

1. What is the average time (in seconds) of repelling capacity of the ultrasonic generating pester device as applied in:

        1.1 transparent container;

        1.2 three by four room; and

        1.3 outdoor setting?

2. What is the average frequency generated by the ultrasonic generating pester device as applied in:

        2.1 transparent container;

        2.2 three by four room; and

        2.3 outdoor setting?

3.  What is the level of acceptability of the ultrasonic generating pester device in terms of:

        3.1 appearance; and\

        3.2 durability

4. Is there a significant difference among the three set-ups of application of  the ultrasonic generating pester device in terms of average time recorded?

5. Is there a significant difference among the three set-ups of application of  the ultrasonic generating pester device in terms of average frequency generated?

C. Statement of the Hypothesis

The following hypothesis will be tested in the study:

1. There is no significant difference among the three set-ups of application of the ultrasonic generating pester device in terms of the recorded average time?

2. There is no significant difference among the three set-ups of application of the ultrasonic generating pester device in terms of the generated average frequency?

Materials and Equipment:

        In devising the experimental mosquito pester, the materials used in the study are as follows: Power supply (9V), Resistors (2.7kΩ x 2), Capacitors (0.01µF x 2), NE 555 timer, IC Diode (1N4007), ceramic transducer, plastic ware, soldering iron, prototyping PCB, battery clip, SPST switch, and thin wirings, ferric chloride, and masking tape.

General Procedure:

        A. Gathering the Materials and Equipment

        In the construction of the battery-operated mosquito pester, the researcher collected the materials from the old appliances which were no longer used in the household. One 9volts dry cell was used as a source of power supply. Two resistors were used for the purpose of creating a precise quantity of resistance for insertion into a circuit. Capacitors act like secondary-cell batteries, being able to store and release electrical energy. NE 555 IC astable multi-vibrator as the oscillator circuit drives to the speaker. IC Diode (1N4007) is used as a check valve to allow the electric current to pass in one direction (called the diode’s forward direction), while blocking the current in the opposite direction (the reverse direction). Transducer from old musical card is used as a device to convert a signal in one form of energy to another form of energy. Other materials were also used such as prototyping PCB, soldering iron, plastic ware, SPST switch, and thin wirings.

B. Working Principle

        The working principle was followed by the researcher in constructing the experimental device. The project is aimed at developing a device that is capable of emitting ultrasonic energy of varied frequencies. These frequencies do affect the auditory senses of pests such as mosquitoes, rodents, avian and nocturnal insects by making the sound uncomfortable for them. However, these frequencies do not affect the hearing ability of humans. This electronic mosquito repellent is based on the 555 timer IC which generates ultrasonic sound with high output frequency. The oscillation frequency is given by the value of the resistors and a capacitor. The actual oscillation frequency of this electronic mosquito repellent is above 20 KHz so what is needed is a good high frequency speaker , like the transducer. The electronic mosquito repellent circuit can be supplied from a 9V DC power supply.

C. Construction of the Experimental Device

        The experimental device was constructed using the series of circuit.  The mosquito repellent circuit will generate an ultrasonic sound with a high output frequency.

Resistor R1 was connected between VCC and the discharge pin (pin 7) and another resistor (RV1) was connected between the discharge pin (pin 7), and the trigger (pin 2) and threshold (pin 6) pins that share a common node. Hence the capacitor is charged through R1 and (RV1), and discharged only through RV2, since pin 7 has low impedance to ground during output low intervals of the cycle, therefore discharging the capacitor. In the astable mode, the frequency of the pulse stream depends on the values of R1, R2 and

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