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To: MicroWorlds Forum <mwforum@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: robot and maze
From: Rotem Kimchi <rotemk2@xxxxxxxxxxxxxxxx>
Date: Thu, 30 Dec 2010 18:19:34 +0200

thanks

I am not familiar with the point reference code, is it a link to a sperate
file you wrote?

the color solution is ok for the simulation but i am not sure about the real
robot because i dont know if i will put a light sensor

2010/12/30 Daniel Ajoy <da.ajoy@xxxxxxxxx>

> On Thu, 30 Dec 2010 05:38:38 -0500, Rotem Kimchi <rotemk2@xxxxxxxxxxxxxxxx>
> wrote:
>
> Hi Daniel,
>> How are you?
>> I created a maze and using two sensors (turtles: Black_Shadow and
>> White_Shadow) I got my car (turtle Robo ) out of the maze.
>> I used the left wall algorithm that can solve every simple OneNote maze.
>> I can't think of a way to let the robot know he finished the maze without
>> using color or possition coordinates do you have an idea that could blend
>> into the code?
>> I know that in most cases "the first way you think about solveing a
>> problem is the best and simplest way to solve that problem"
>> but I think there is room for improvements so
>> I am sending you the code hoping you could take a look and maybe could
>> offer me ways to improve it by:
>> adding functions or maybe adding recursion function to solve the maze
>> In order to cheak the code all you need to do is to press only on the
>> foward ("38" ascii) arrow
>> The end goal is to use this code and others in a real robot that will
>> preform every day tasks on command autonomously or by remote control while
>> writing simple logo commands
>>
>
>
> It happens that I had created something very similar years ago. The main
> structure of the program is like this:
>
> to main
>  create.maze
>  startup.position
>
>  while [inside.maze?] [
>     orient
>     give.step.forward
>  ]
> end
>
> to turn.left
>  turn.right
>  turn.right
>  turn.right
> end
>
> to orient
>  turn.right
>  while [wall.infront?] [turn.left]
> end
>
> ;===========>
> So the procedures that you need to define are:
>
> create.maze
> startup.position
> give.step.forward
> inside.maze?
> turn.right
> wall.infront?
>
> Here is my definition of wall.infront?
>
>
> to wall.infront?
>  penup forward 10
>  make "x 9 = colorunder
>  back 10
>  output :x
> end
>
> Notice that if there is wall in front of the turtle:
>
> show 9 = colorunder
> true
>
> but, if there is not a wall in front of the turtle:
>
> show 9 = colorunder
> false
>
> Notice that "wall.infront?" can be implemented by a sensor in front of the
> robot. No other sensors are requiered.
>
> I can't think of a way to let the robot know he finished the maze without
>> using color or possition coordinates do you have an idea that could blend
>> into the code?
>>
>
> My definition of "inside.maze?" uses colorunder
>
> to inside.maze?
>  output not colorunder = 15
>
>  ; the area outside the maze is red
>  ; while the turtle is not stepping on red, she is inside.
> fin
>
>
> Daniel
>
>

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