Using light dependant resistors
September 1, 2011
So i'm playing robotroom's PWM circuit and turned it into this:
using one half of the duty cycle on each motor by inverting the signal for the 2nd motor.
so far it works, but i am stuck on how to implement phototropy.
here i have placed LDR's parallel with each side of the potentiometer, but makes a very short range of detection.
basically it refuses to react in any way unless it gets at least 100 lumens or so, and then i seem to get maximum
effect on the motors. (the same effect as turning the pot fully to one side.)
the transistors are 2N3904
i tried it with PN2222 but that didn't work for some reason.
the LDR has a range of about 200 Ohm to 2M
so like, now what?
does anybody have a good link on manipulating the behavior of LDR's?
also, is that where the problem lies, or am i missing something else?