This weekly report discusses progress on a remote control circuit project. The student designed a transmitter circuit and programmed a microcontroller to generate signals from inputs. Initial testing showed the signals were too short in range. Analysis found the output voltage was dropping, so an amplifier needs to be added to the IR driver. The next steps are to build a receiver circuit and decoder to complete the project.

1. [INC 281 MULTIDISCIPLINARY WORKSHOP WEEKLY REPORT] April 20, 2012
FName-Surname Apichai Pansrisakoon
Student ID. 53219003
Group Name HAPPY 361 Degree
Engineering 2A : Tong, Toey, Jip, Pui
Team Members 2B : Path, Jame, Por, Kang, Note, Jimmy
Product Design
P’Katall, P’Klao, P’Earth, P’Chompu
Team Members
Weekly Progress
After, I studied what is Sony D7C5 Protocal and how is work. In this week I designed a circuit of
remote transmitter and writing program in PIC16F877A to generate signal when got a signal in each
input. First time in programimg I got a little problem, that is PIC16F877A dosen’t generate a signal
when it get input signal already. I tried to solve this problem by debugger in compliler then I
founded, I modify this code and tried to made it work immediately. Although I finished in
programming I still had a problem in transmitter case.That is transmitter sent signal too short just
5 cm., it’s closer than before gernerate signal. I measured output of microprocessor by used
electical multi meter in VDC mode, I founded the voltage in output pin was droped and I realized I
should to design a new IR driver part to amplify power of sending better. However, I’m still testing
it right now and waiting for result.
Figure 2.Sony D7C5 Protocal
Figure 1. Ex. Transmitter Circuit
Engineering Analysis
Strong Point
Right now, no longer a problem about programming in transmitter.
Week Point
When the outputs from microprocessor have a frequency, voltage will drop. I can’t control or solve it
right now. I’m still finding some how to make it work.
Department of Control System and Instrumentation Engineering
KING MONGKUT’s UNIVERSITY OF TECHNOLOGY THONBURI

2. [INC 281 MULTIDISCIPLINARY WORKSHOP WEEKLY REPORT] April 20, 2012
Next Week Job
I will make receiver circuit and decoder a signal to finish.
Department of Control System and Instrumentation Engineering
KING MONGKUT’s UNIVERSITY OF TECHNOLOGY THONBURI