CONCLUSION

Our project title is Electronic Animal and Insect Repellent project. The purpose of this project is to build a circuit or product functioned as an animal and insect repellent, such as dog, cat, mosquito and many more. The main function of this electronic repellent is that it can generate high frequency that are annoying to animal and insect depend on its type and range of frequency generated in the same time not be hear by human. We upgraded this circuit so that it will not repel one kind of insect or animal but a lot of species depends on the frequency of sound emitted. Moreover, we have modified the circuit’s voltage supply so that it can be easily used at outdoor condition.

This circuit or project can be helpful in domestic area by keeping the mosquito and other similar creatures away using a high frequency sound produced by the circuit. This repellent should be come in handy when used at outdoor condition like lake and park.

Based on the theory, a 555 Timer is needed to gain the function of generate frequency. 555 Timer acts as an Analog to Digital Converter as it can convert analog voltage signal to digital frequency signal. In Astable Multivibrator mode, it acts as an oscillator to generate clock pulse in a wide range of frequencies with enough output power to drive the IC. In order to control the frequency generated and also made the circuit functioned to generate variable frequencies, a preset resistor and variable resistor have to be included. As both resistors vary the resistance value to gain a needed frequency to be generate.

In order to success this project, we have take proper method to design and construct the circuit. We have used Livewire software simulation tool to simulate the circuit inside computer. After that, we have connected the circuit into a breadboard to test run the project before transferred the circuit to a circuit board. Finally, after test run several time, we have soldered the components followed by the arrangement of the circuit to a circuit board to finalize the prototype.

Based on the simulation, we have found that the circuit is successfully run as what we have expected base on the theory. The concept of the circuit is to generate continuous stream of rectangular pulses having a specified frequency. When 555 Timer in the astable mode, the frequency of the pulse stream depends on the values of R₁, R₂ and C as can be calculated using formula. Thus, when the value of R₁, R₂ and C are 220Ω, 6490Ω and 0.005µF, the speaker will emits a frequency of 21.85kHz as this range of frequency known to be annoying for insect like mosquitoes but totally cannot be hear by human.

However, our project is still not reach full complete functions as it can be improved. There are many ways to improve the circuit of which is to put sensor and led lights in the circuit to detect mosquitoes. So, we will be able to know when there are mosquitoes all around us. It is also able to prove that this circuit works well because if the led light does not work that means the area is safe from the mosquitoes.

In addition, we can use direct current and the battery charger circuit. Thus, this circuit can operate when blacks out because usually mosquitoes attracted to dark places and can protect humans from mosquito attack. Almost electrical equipment cannot be used when a failure so the problem is surmountable with two ways to make electricity.

Next, we can improve by enlarging the field to repel mosquitoes so we can use a circuit covering a large area. In addition, this circuit could apply to another system and it is not limited to mosquitoes only if we modified the frequency. Besides that, we also can modified the produce of sound that can easier detect any other animal not only mosquitoes such as produce the siren or yap dog sound. This method may be also applied to the circuit and it will become more useful and can make our life easier.