1. [INC 281 MULTIDISCIPLINARY WORKSHOP WEEKLY REPORT] May 9, 2012
Name-Surname Ms. Pornprom Nisaimun
Student ID. 54261518
Group Name Instinct
Engineering Team
M, Kung, Boss, Mic, Yui, Arm, Ball, Garfield, Top, Ice
Members
Product Design P’Jub
Team Members P’Ploy
Weekly Progress
Refer to presentation of Spoilage Food Detection last week, our project has commented
many things. There is some complained to my responsible part. It is switching transformer’s LED
beam while unplug the transformer. And ID student ask me that can I keep the switching
transformer inside the platform. To carry out these recommended, I have already modified the
charger circuit as figure 1, and I already put both the charger circuit and switching transformer into
the platform.
To protect current through the switching transformer when unplug it, I add the diode series
with LM317.
Moreover, I add some function to charger circuit. That function is when I connect the
batteries to charger, the indicated LED will beam. I have done it by using comparator amplifier. It is
comparing voltage between Vref 8.2 V (Zener diode no. 1N4738A) with Vout which normally
voltage is 8.25 V until I connect batteries Vout will be decrease equal to battery’s voltage. When
Vout less than Vref, the indicated LED will beam represent to charging batteries.
Figure 1. Charger circuit with diode protection and
indicated LED
Figure 2. Inside platform
Engineering Analysis
Strong Point
- Both PCB of charger circuit and switching transformer can keep into the platform.
- The indicated LED can represent charging status well.
Week Point
- The platform is no ventilator. It may be cause to high temperature of devices inside the
platform.
Next Week Job
Prepare the documents and video to presentation.
Department of Control System and Instrumentation Engineering
KING MONGKUT’s UNIVERSITY OF TECHNOLOGY THONBURI