In this week assignment, I have to design input device. That has sensor and have to measure somthing.

It can give input to the board to do any task I designed a board using Attiny44 that has input signls
from sensor. searching on internet I seen below diagram that gave idea about sensor input to microcontrollers

I decided to try out light intensity input device. This is because until I havent made any steble and long lasting
light sensor circuit using trough hole. It become bulky too. I started with designing a circuit board with a ATTINY44
So my input device had been working on input signal from light sensor. So i design my own board.

followed procedure

Design a circuit board

Mill the circuit board

Read out the board

Programming

Desiged Board in EAGLE

I used Eagle again to design the board and I added the components. However, first I took some wrong pin headers, instead
of using the SMD 2x3 header I used the 6pin through-hole header. The same for the 4pins header so I needed to change this
after placing the right components I designed the board layout.I made some changes in Hallo_world board. It was only design
changes. And I put light sensor instead of reset button

Programming

I installed arduino IDE for programming. But during installation i faced lots of problem. I was able to upload the basic blink sketch
earlier, but now that fails as well. Yes I have verified I am selecting the correct COM port and board and am using the most recent
version of the application. But I did not get what went wrong there. But stoped all delet installed version and again followe the inst
llation process from start to end. Its my frustrated step of problem solving everytime i followed when get frustrat. But it works somtimes
It happens to me this time it works.
Now need to program microcontroller. As I had programmed Hello world in week ago. This time I felt exited for programming. So
I followed Embedded Programming assignment to write program and upload it on microcontroller sucessfully. I did many mistakes during.

I wrote program and i got error for such simple program of led blinking. It hapaned many times. I had checked many times but I did not
get Why do I get an error? Then i left from there just get relax and came back after some times spending outside. Just review program.
So there suddenly I find mistek that i did not declaired variable to int led=10 onec it placed my proram get compiled immidiatly

int led = 10;

// the setup routine runs once when you press reset:

void setup() { 
               
  // initialize the digital pin as an output.

  pinMode(PA3, OUTPUT);     

}

// the loop routine runs over and over again forever:

void loop() {

  digitalWrite(PA3, HIGH); 

  // Port A P3 is High (HIGH is the voltage level)

              
 }