Project DLEO - Rangkaian Pengusir Nyamuk

Summary

In this project presentation, Nova introduces a mosquito repellent circuit developed as part of their final project in the D4 Automotive Engineering program. The circuit uses an IC 555 as the central component and operates on the principle of emitting high-frequency sounds that repel mosquitoes. The design focuses on providing a portable, environmentally friendly alternative to chemical repellents. The presentation also covers the schematic design, PCB layout, and physical casing, emphasizing the ease of use and portability of the final product. Nova concludes by inviting feedback and offering an innovative solution to pest control.

Takeaways

• 😀 The presenter introduces themselves as Nova, from the D4 Automotive Engineering program, and explains the purpose of their project, which is a mosquito repellent circuit.
• 😀 The aim of the project is to create an alternative to commercially available mosquito repellents, offering a portable and effective solution.
• 😀 The schematic of the mosquito repellent circuit is shown, and it is designed using Proteus.
• 😀 The circuit uses an IC 555 timer as the central control, a sounder as the output, capacitors for power supply, and a switch for on/off functionality.
• 😀 The sounder emits a sound similar to explosions, which could be replaced by a buzzer in a real-world scenario.
• 😀 The circuit works by charging a capacitor through a variable resistor connected to PIN 8 (VCC) of the IC 555.
• 😀 When the switch is pressed, the capacitor discharges, and the current flows to the output, activating the sounder.
• 😀 The circuit uses a stable operation mode, where the capacitor’s charge continuously cycles between 0 and 1 as long as the switch is pressed.
• 😀 The capacitor's value, along with the resistor, influences the sound produced by the sounder. A smaller capacitor value results in higher frequencies that mosquitoes dislike.
• 😀 After testing the circuit, the next step is to design the PCB layout with separate layers for top and bottom components, ensuring no conflicts in the design.
• 😀 The presenter demonstrates a 3D visualizer of the PCB, which shows the layout and cover design for assembly and final product testing.
• 😀 A casing is designed for the PCB, which includes an on/off switch, a cover with mounting holes, and openings for sound emission, making the device portable and easy to carry around.

Q & A

What is the main purpose of the mosquito repellent circuit project?

The main purpose of the mosquito repellent circuit project is to create an alternative to chemical mosquito repellents by designing a portable and efficient electronic device that uses sound to repel mosquitoes.

What components are used in the design of the mosquito repellent circuit?

The circuit design uses an IC 555 timer, a sounder (or potentially a buzzer), capacitors, resistors, and a switch to control the circuit's operation.

How does the circuit generate sound to repel mosquitoes?

The circuit uses a stable multivibrator principle where a capacitor charges and discharges through a resistor. When the capacitor is charged, it triggers the IC 555 to emit a signal that activates the sounder to produce high-frequency noise, which mosquitoes find unpleasant.

Why is the capacitor value important in the circuit?

The capacitor value affects the frequency of the sound emitted by the sounder. Smaller capacitor values result in higher frequencies, which mosquitoes are more sensitive to, making it more effective as a repellent.

What is the purpose of the switch in the circuit?

The switch controls the flow of current to the capacitor. When the switch is pressed, the capacitor charges and discharges, generating the oscillating signal that drives the sounder.

Why was the sounder used instead of a buzzer in the design?

The sounder was used because, in the simulation software Proteus, the buzzer did not display the desired output. However, in a real-world application, a buzzer could be used as a replacement for the sounder.

How does the PCB design support the functionality of the circuit?

The PCB design includes two layers for routing the electrical paths: one for the top and one for the bottom. This helps to avoid short circuits and ensure proper functioning of the circuit. The design also includes a 3D visualization to aid in assembly.

What are the main considerations when designing the PCB for this project?

Key considerations include ensuring that the routing is correct and error-free, with no short circuits or model errors. The PCB also needs to be designed for easy assembly and practical use in the final product.

How is the casing of the mosquito repellent circuit designed?

The casing is designed to be portable and similar to a power bank, with a green color. It includes four screws for securing the PCB, sound exit holes to amplify the sound, and an on/off switch to control the circuit's operation.

What is the importance of making the mosquito repellent circuit portable?

Making the circuit portable allows users to easily carry and use the device wherever needed, offering a convenient and practical solution to repelling mosquitoes without relying on chemicals.