questions for the instructables make to learn youth contest :
what did you make?
-i made a light/dark sensor based on the LM741 opamp using parts from my local electronic store.
how did you make it?
- i got the idea from a video about making a dark /light sensor using arduino,so i decided to make an easier version of it.
where did you make it?
-i made it at my school and entered it for my science fair.
what did you learn?
- i learnt how a op amp works and how to use it and all the cool circuits you can do using it.
Step 1: COMPONENTS :
-4.7k resistor x1
-photo resistor x1
-180 ohm resistor(i did'nt put a picture for this)
-lm741 opamp ic
-l.e.d(any color) x1
-9v battery snap and
- a breadboard