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Posted: **11 Jan 2011, 16:30**

I want to write a NXC program to sort 4 color bricks (Blue, Green, Red and Yellow) by a Lego Color Sensor into relevant color baskets.

There are 4 empty color baskets (Blue, Green, Red and Yellow) to be fixed in a moving train which is controlled by M1.
The train moves, to and fro, to collect a color brick by the relevant color basket, after scanning by the Color Sensor.

M2 is used to allow a color brick to drop into a basket each time along the Outlet after brick scanning.

The four color baskets in the train are placed in the order of [G] [R] [Y], where , [G], [R], [Y] representing by Blue, Green, Red and Yellow
color baskets respectively.

The distance, between any two adjacent color baskets (or degree of motor M1 to be rotated from one color basket to the adjacent color
basket) is denoted by d.

The starting point is the red color basket facing the Outlet from which it drops.

The estimate chances are as follows:
Group 1: â†’[G] = d, â†’[R]= 2d, â†’[Y]=3d,
Group 2: [G]â†’ = -d, [G]â†’[R]= d, [G]â†’[Y]=2d,
Group 3: [R]â†’ = -2d, [R]â†’[G] = -d, [R]â†’[Y]=d,
Group 4: [Y]â†’ =-3d, [Y]â†’[G] = -2d, [Y]â†’[R]=-d.

How about the program?

Can you help give a hint or suggestion?

YH Chan

Posted: **11 Jan 2011, 17:59**

Hi Chan

Have you built the sorter in LEGO yet, or are you writing the program first?

I'll assume you have the sorter built. Next step could be to write some pseudo code to figure out how the machine should work, eg:

Code: Select all

start program
start conveyor belt
while sort bricks

    wait for a brick to arrive at the colour sensor
    colour= scan the brick colour

    switch colour
        case red ...
        case blue ...
        ...
        case unknown ...
    end switch

end while

stop all motors
end program

The pseudo code is a great help to understand the problems involved, and to illustrate for others how you intend your program should work.

Kindly,

Povl

Mindboards

Sort Color Bricks Problem

Sort Color Bricks Problem

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