Allow me to start with excuses today…

What is ohm with a cute shape??

I’ve never learned physics in my life. It’s not a mandatory class in Japan.

I struggled with this assignment very much. I spent several hours watching training videos and YouTube videos and playing with breadboards and Arduino. Then I realized that what I need to learn is physics, not how to use TinkerCad…even though my professor told me physics knowledge is not required for this assignment…

I cannot find good materials available online to learn basic physics for circuits. Most of the materials I found were too theoretical or too practical. If anyone knows good materials or tools, please advise!! Something for kids is ideal for me…

 

Finally, I made this.

Honestly, I just followed the instruction and don’t fully understand how it works…

LED is off

LED is on

What I’m not sure is…

-Which inputs on Arduino I should use.

I learned inputs marked A0-A5 are analogue pins that can detect a gradually changing electrical signal. I don’t know the difference of functions between analogue and digital. It worked when I moved input for photoresistor from A0 to A5, while it didn’t work when I moved inputs for LED from 9 to 13. Why is it?

-How I can find the good resistance level for each resistor

I learned Ohm’s law, E=R*I. The tutorial said I should use 4.7K ohms for the left resistor and 220 ohms for the right resistor. When I changed them to 10K ohms and 330 ohms respectively, it worked. Why is it? If I don’t have this instruction, how can I find the good resistance level balance?

 

Now, I’m so worried about the next assignment.

Hope I can find a way to deal with it…