Hello
I already finished my line follower but I was not satisfied with the speed. There is a testing track at school and others finished it in just 34 seconds. Mine finished it in 80 seconds! That is so slow. I used a 1.5 volts battery for the driving motor. When I changed it to 3 volts (series two 1.5 volt batteries), the line follower is very fast that it goes out of track. My problem now is how to vary the input voltage into 2 or 2.5 volts maybe or make it variable from 1.5 volts to 3 volts. Any idea on how I would make the circuit design? This would be the speed control of my project.