STEP01: CONNECT FABISP WITH T-BOARD

• Now to connect FabISP and my board I have to identify pin configuration and respective connections by female to female jumper wire.
• The method I have used here is to connect reset to reset pin first and accordingly connect all respective pins such as SCK, MISO, MOSI, VCC and GND of ISP header.

STEP02: USE ARDUINO IDE TO USE FABISP AS PROGRAMMER

• Ardiuno IDE (Integrated development environment) is programming platform used to load program into microcontroller.
• The Arduino IDE supports the languages C and C++ using special rules of code structuring. It has text editor feature with syntax highlighting, text cutting and replacing.
• Now, to work on my baord, I have to select programmer as TinyISP from Tools.
• Board as ATtiny 25/45/85
• Processor: ATtiny 45
• Clock: External 20MHz

STEP03: WRITE A PROGRAM TO BLINK LED WHILE PRESSING SWITCH

• I have already wrote this program in week 7, so I have loaded the same program and make changes in pin number.
• I have wrote program with basics of C language I knew  and by referring some of example codes. Kishan Chavda helped me many times to understand codes and syntax for the same.
• I have used if and else condition to execute blink LED instructions with delay.
• Complete code can be seen here in below image, and program files can be downloaded at the end of this page.
• I have also tried reversing the code, so LED blinking gets stop once I press button switch.

• Once code uploaded in board it was working fine with button [switch, which can be seen here below.

• Reversing the if else condition, so that when I press button it stops blinking.

• Reversing the effect in LED and switch.

STEP04: ADDING LDR SENSOR TO MY BOARD

• To move one step further I wanted to program my board with some kind of sensor.
• So, I have decided to add sensor in my board, I had one extra T-board which I have made in week 7. So I used same board and replaced switch with LDR sensor.
• It should work because micro-controller pin which is connected with switch pad is analogue I/O pin.
• So I collect my board, components with LDR sensor and soldered it.

STEP04: Connect LDR sensor board with FabISP

• Now I have to connect my board with FabISP same way as done previously by header pins of both the boards.
• Once connected I have inserted FabISP in one of the USB port of my computer system
• For through hole input device, circuit board is designed by drilling holes while milling, that is done here in week 11

STEP04: PROGRAM BOARD TO SENSE LIGHT WITH LDR AND OUTPUT BY LED

• Now I opened Ardiuno IDE and selected same programmer, board, processor and clock value to program the board again with FabISP
• To write program for LDR I used reference from Instructable, and it was good help for me to understand program.
• I have defined pin number 4 (LED) as output and pin number 3 (LDR) as input, as per my design of connections in board.
• Secondly I have took "a" as integer and defined its value as less than or equal to 300 to start with. AnalogRead is sintax used to take value from LDR.or
• Once it comes under value it goes to if loop with LED blink code of high and low with delay.
• After some trial and error, 800 is right value for LDR sensor to sense the light and give output as LED blink.

• With different values of LDR sensor limit.

LEARNING CONCLUSION

• After going through this weeks assignments and exercise now I am able to understand what is embedded programming and its requirement for functionality.
• Completing this week I got clear idea and link between electronics design, production and programming. How these three depends upon each other and consideration need to be made right from design part.
• I am looking forward to apply these learning to design my final project's board.

ORIGINAL FILES

• This weeks original programming files I am attaching below as a single folder. It can be accessed from here

INDIVIDUAL CONTRIBUTION TO GROUP WORK

• This week's group assignment is to study different types of architecture of micro controller.
• I have studied Harvard type architecture, and took comparative overview of  von nuemann type design.
• Basically in harvard type design CPU and processors are being kept in parallel, so when data is being given to controller, CPU acts as central part between memory units
• Harvard architecture performs better when there is need of image processing and graphics, so most of the today's advanced devices follows this design.