05 weekly report (9 may 2012)

[ ] May 9, 2012

Name-Surname Ms. Pornprom NisaimunStudent ID. 54261518

Group Name Instinct

Engineering Team Members M, Kung, Boss, Mic, Yui, Arm, Ball, Garfield, Top, Ice

Product Design Team Members

P’JubP’Ploy

Weekly ProgressRefer 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 AnalysisStrong 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 JobPrepare the documents and video to presentation.

KING MONGKUT’s UNIVERSITY OF TECHNOLOGY THONBURI