555 timer photovore (light seeking robot) is unbalanced? Answered
I have prototyped a 555 timer photovore (light seeking robot). I have built it and i am getting good responses from the LDRs. but when the sensor inputs are equal (heading straight toward light) one motor goes faster than the other. it is the same motor that is faster every time. I have noticed that the robot kinda uses one LDR as a control sensor(to compare to other sensor), the other sensor is the one that makes more of a response to the motor. That might not be true but that is what it seems like.
I got the idea from this video: http://www.youtube.com/watch?v=0p76f7YLwzY
In the video, it mentions that he also used a "trim pot to fine tune his robot" If that is what i need, please explain to me with a picture and words how I would incorporate that in the circuit.
I have also attached a schematic that i used to make the circuit., and some pictures of my breadboard setup. Please tell me if there is anything wrong with the setup, or any thing that I could change.
I'm very desperate to get this working, as I have already spent $45 in this robot. Please help me.
Thanks for reading!