I have the following questions regarding analog inputs in arduino
first of all, which im guessing its normal, but i'll ask anyways: is it normal for the values from a sensor to fluctuate randomly near a number (meaning the sensor is working, but the value goes randomly up and down)?
the second, and more important thing.
i had a basic ldr (http://www.olimex.cl/pdf/ZX-LDR.pdf
) setup connected to analog input 0 . all was fine till I added a second sensor to the mix, leaving me in WTF state. Thing is, values keep affecting each other, also , it seems the analog 1 gets a lower value than the 0, and both are the same sensors, using the same resistors under the same light conditions (both are taking power from the same source and go ground to the same outlet , which I guess its the part im getting wrong)
any suggestions? I guess its a pretty basic thing but its really annoying... I read using resistors from sensor to ground solves the problem but in my case it didnt seem to do anything at all (using 300 ohm resistors, too low maybe?)
yes, i've used the search function.
thanks a lot to whoever replies, bye!