6th week...

On this week,I have done the transmitter circuit constructing and testing it without pairing with the receiver yet. For the main circuit design, I have difficulty to print it out so I had to construct it again with the Dip trace software manually to maintain the component position. 

Transmitter circuit

to stick the circuit to PCB, I use the iron to heat it and make the ink glue to the PCB. The process take about half hour to be done. After the transparent paper remove, the board soak into the etching solution to remove the unused copper and board washed with water before scrub it with sand paper.

Printing circuit

5th week: Report and circuit

In this week, there been held the FYP briefing to guide student about how to write the report properly and gain maximum marks and knowledge to implemented to the work environment. In this week also updating the programming for the main board which is using the C++ language.For the report writing updating process, the focus is more to the chapter 1, 2 and 3 but yet not finishing the chapter 3 (methodology) because the process of this project still ongoing and it will be updating from time to time. There still plenty of process that undone like troubleshooting and testing the range of the RF module because the error occur high. I been planning to submit the draft of the report next week and focusing to the main circuit construction.

RF receiver

RF transmitter

4rd week...finishing main circuit design.

The main board circuit design completed and can printed. The circuit simulate using the Proteus software and because there no RF receiver and transmitter in this simulation software, it replaced with the push button to test it function or not. In the software part, the RF module use as interrupt to the main loop or function to get the desire traffic light turn to green. To adding the safety features, when the interrupt signal send to the port, all the traffic light will turn to yellow before the desire traffic light turn green. This to avoid the others involved into crash and give more trouble to the emergency vehicles. 

I have planned to alter a bit the program from using timer to using the other interrupt signal to off the interrupt cycle because if the vehicles not pass the junction but the traffic light already turn to red, it just like others system and reduces the efficiency of the system. Furthermore, I planned to start my report writing next week or next two week.
 

proteus design

3D view of board

 

3rd week: update...

In this week, I continue with system program and calculation of the wavelength. For my programming part, I alter the simple loop of traffic light with adding the interrupt for the RF module. I have some problems with it because it bit difficult to understand and give variable output when it run in the simulation diagram that I done previously.

To encounter this problems, I have to redesigned the diagram and add the push button to replace the RF receiver. In the end of the week, resolved it but the programming part will be continue on next week. The wave length of the RF module can be determine by using the formula F/C which is C is constant.

New simulation model with button