in a laser tripwire setup i run the photocell calibration code and the numbers shown on the serial monitor screen never get above 15 with laser light and 35 with led light. much lower than the values shown in tutorials. i am using a 10k resistor with the analog input and all the circuitry is correct. any help would be apreciated
What sort of light sensor are you using: LDR, photodiode, or phototransistor?
Whichever one it is, if you want to improve sensitivity, you need to increase the value of the resistor from 10K to something higher. Try 100K.