Question about line following

[Khách]

i've bought the single line detector
http://www.lynxmotion.com/Product.aspx?productID=58&CategoryID=8
and the line tracker ,now im experimenting with the single line detector it works fine with black and white .. but the problem is im using it for robocon 07 contest and the background is blue and the line is white , im having some problems for tuning the blue color , is there any solution please

thanks alot

Ahmed , EGYPT

[falleaf]

Turn your VR on the sensor package to choose the threshold, so you can detect many colors.

Goodluck

[Egyptian]

hi, thanks for your reply , the problem is i bought just 4 sensors from the above one (single detector) and the rest bought that product http://www.lynxmotion.com/Product.aspx?productID=57&CategoryID=8

it just uses schmitt trigger , i wonder , if it will work or not with this year surface :( :( , im so scared really cuz we paied alot for that order.

also i've another problem , i tried to PWM the two motors to let the robot move in straight line , also it didnt work , there's also some steering to the right wheel and it bends to right , tried to tune the pwm delay , didnt work , is this a problem from the mechanical design or what ?

also i've seen many videos on youtube , i wonder how do you make the robot move fast and in straight line like that ?
also i noticed that you use small diâmeter of the wheels , it does affect ?

also do you use new motors or used motors for the driving wheel motors ?

also , how do you achieve PWM and at the same time on the motor and use line tracing ??
thanks alot .

[falleaf]

This second one will not works! It's only for black/white detection.