Degree life.... part 2

Ah.. the exam is over. Still worry about it. =(

Watched this movie right after the exam. Its a nice and exciting movie. Like my friend said, pity all the police cars. Hahaha..

Anyway, it seems that I have wasted quite a lot of money in this semester on a Mini Project and also a H-Bridge DC Motor Controller. These two projects hit my pocket a while. LOL... Nevertheless, I'm satisfy with the projects that I have gone through.

About the H-Bridge design, it is a circuit that can control the speed of the DC motor without any power loss. It took me a while cracking head together with Wen Ping and my other teammates on this design. Sadly, our design got rejected for about ermmm three times xD

But once the design is Up and approved, transforming it from paper design in to a real circuit is done. Thanks to the fast action from Joel and Hui Mei, we manage to get the components on time to be tested before meeting the deadline. Somehow, when come to assignments, deadline is always the best motivator. It drives you further than you can imagine. Hahaha... but it is also bad =(

Credits to Joel and Hui Mei for constructing this

Somehow, when testing high current circuits, I think I don't want to touch any of the electronic components with my LEFT hand. For some unknown reason, any circuit that i touch with the left hand will make me become like the picture below

You may say maybe it's just a coincidence but will you still call it a coincidence when you got it trice??? =D

Upon testing and troubleshooting the circuit, it is finally proven that the design works. YAY!!! * so happy till the rest of the day no mood to study =.=

It has been a while not looking at an analog Oscilloscope

Here comes the money wasting part... PCB
We are not allowed to demonstrate our project on the breadboard. Each of us must come out with a PCB layout design to be demonstrated. Due to my laziness, I let my friend do for me :p
Anyway, I still want to thank him, Ooi Xans for the design. When he sent me the design, I was shock to see how compact his layout is which is a good thing. *Salute him man

"My" board

And when a person becomes to bored and stressful, weird things starts to come out.

Guess what shape is that?

Hahaha... I remember after completing this Lab, I have a test to sit. A test that i have ZERO knowledge on it. Thanks to OHM for the crash course, I think I can still tahan kua




After all of this are done, I still have one more to go. The Mini Project.

What project????

Well the title of the project is Infra Red Proximity Rear Sensor.

WHAT???

It's simple circuit which uses Infra Red sensor that commonly fixed at the back of your car to sense the range of the object and the sensor.


This circuit ahhhh, I tell you all laaa.... Make me pek chek the most wan errr..... Very funny wan wor, the circuit only works at night wan wor, it does not work at day time wan. Wasted my two days troubleshooting it when only I realize that Infra Red are sensitive to sunlight and to overcome this problem is by lowering the resistance value at the receiver.

Infrared Under Camera lens

Well nevertheless, that wasn't my job. My job is to write the source code to interface the sensors with the Microcontroller asking the processor to perform certain actions when receiving certain voltage signal (Analog to Digital Conversion)

When a signal is non consistent like I have encounter, the programming will be very hard. You will get to see the message displayed below.


Arghhh.... The initial plan was to display the distance in between the object and the sensor on the LCD but due to variation and inconsistent signal, a few hours before demonstrating, I got to sit down with my partner and discuss weather to scrap off the LCD section. It is than we came into decision instead of showing distance, why not we just show the rage, Eg: Close, fairly close, extremely close. Thank god, this is just programming work and requires no alteration on the hardware design. Otherwise, we have insufficient time

Tadaa, the final outcome of it