Arduino BOE-BOT to follow black line that switches to grey

Hello everyone!

I faced a problem with boe bot to follow a black line with turns. At one point of the trace the line switces color to grey and bot should stand still at this point and w8 for permission from another (using nRf signals) bot to keep going. The problem is that my bot in sending the request for permission even if it rides on black color. in other words, bot somehow recognizes black line as grey. I am using 3 qti sensors to control the movements of robot, so it could easily turn if one of the side sensors is crossing the black/grey line.

Can it be the problem that half of qti sensor is scanning white surface and others half is scanning black surface and as the result there is "grey" outcome?

Welcome to the forum

The problem is in the sketch that you did not post. Please post it here using code tags (the </> icon) and give details of your sensor

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