WEEK 6

On this week I want to do the etching on the PCB that I finish draw. below is the step to do the etching:

1) PCB, salt and water. The PCB need to soaked with the salt water because to vanish the green colour on the board. 

2) Then it will appear the line that have been draw on the board.

3) Next the PCB need to soaked with the ecthing powder

4) After we soaked with the ectching powder the PCB only appear the line that we draw and the PCB colour change.

5) Then again need to soaked with the thinner to vanish all the green line. This step to make sure that the unwanted line is disappear.

6) Finish all the step of etching

THURSDAY, 23 FEBRUARY 2012 (PROBLEM STATEMENT OF PROJECT)

PROBLEM STATEMENT

The development of Rat Repellent system is to ensure the frequency of Ultrasonic sensor to cover at all houses but it is difficult to do that because the frequency cannot through the wall. So, the solution for this problem is to do a different unit. Small unit is to place at all area that the human detect the habit of rat or the area that always have a rat. By doing the small unit the house is protected by the ultrasonic repellent. The Ultrasonic repellent is not on all the time but it only on when the motion detector detect the rat. The other problem is how to make the main unit function as a wifi to send the signal and receive signal between small units.  So, the solution is to use Radio frequency (RF) 315MHz as the transmitter and receiver. Next is how to communicate between the small unit and the main unit in order to make the process function as a wifi. Lastly is the small unit needed to have a long lasting battery because the user will not to charge the small unit every day. It is because it will burden the user to charge the small unit every day and it gives the badness outlook to user to buy this product.

 

Scope of project

The scope of this project is to develop the current electronic repellent and evaluate the behavior of the rats by using ultrasonic rats repelled.