Task: follow line and stop in front of an obstacle.

Put an obstacle on a black stripe glued on top of a white surface. Program the robot to follow the line and stop in front of the obstacle. As a template, You can use the previous program for line-following with 2 transistors:

void RobotLine::loop() {
	if (line(5))
		go(10, 80);
	else if (line(3))
		go(80, 10);
	else
		go(60, 60);
}

Show solution

void RobotLine::loop() {
	if (line(5))
		go(10, 80);
	else if (line(3))
		go(80, 10);
	else
		go(60, 60);

	if (frontLeft() < 60)
		end();
}