EV3 Problem

EV3 Problem

1. Sensor

   • Colour senser
     • Used for navigation, by allowing code to be attributed to a specific colour
       • The sensor is always faulty, so not ideal
       • Dual sensor is required for this
   • Motor
     • Large motor
       • Moves the wheels
       • Required for navigaton
     • Small motor
       • Moves the arm of the robot
       • Required in celebration of mission
   • Touch
     • Able to recognise when the button has been depressed
       • Used to detect immovable box
       • Sensor is not very sensitive so a bit hard to activate
   • Ultra sound sensor
     • Detects when there is object close by
       • Used in immovable and moveable box codes

2. Constraints

   • Colour senser off side
     • Things like line following will be inaccurate
       • Makes the navigation harder
       • Might not be able to complete the course
       • Time consuming, larger code required to fix fault
   • The map
     • Orientation is unchangleable
       • Fixed path meaning that no skipping will be allowed
     • There are 2 possible starting locations
       • Therefore must adjust code to meet the certain requirements of starting at either end
     • 2 possible moveable objects
       • The 2 codes will be slightly different for each the cardboard box and the lego cube
   • The build of the ev3 robot
     • The parts of the robot can not be changed
       • Could have to use multiple sensors to execute command, as current sensors are too little

3. Prescribed criteria

   • Can line follow
     • Robot is able to turn left
       • Robot is able to determine when to turn left
         • Robot uses a specific function to find where the black line is then turn according to that reading
     • Robot is able to turn right
       • Robot is able to determine when the turn right
         • Robot uses a specific code to be able to find the black line again, and turn the according way only when the black line is seen
     • Uses colour reflection or PCT value
       • Knows the PCT value of the black line
       • Knows what do if the PCT value doesn't equal value that is stated for black
   • Robot is able to move a moveable box
     • Robot is able to detect the box
       • If touch button depressed then box is moveable
     • Robot is able to determine whether the box is moveable
     • Robot is able to turn
     • Robot is able to line follow
       • Robot is able turn right
         • Can turn right motor
         • Can turn both motors
         • Robot is able to determine when to turn right
           • Has to use black line following code
       • Robot is able to turn left
         • Robot is able to turn left motor
         • Robot is able to turn both motors
         • Robot is able to determine when to turn left
           • Must use the black line following code involving the PCT value of the black line
       • Able to determine a PCT in order to know when to move
   • Robot is able to navigate around immovable box
     • Robot is able to detect box
       • If touch sensor is depressed then it is a moveable box
     • Robot is able to determine whether the box is immovable
       • If touch sensor is not depressed but there is an object within less than 5cm, then it is a moveable box
     • Robot is able to turn
     • Robot is able to find line
       • Robot is able to turn
         • Robot is able to turn right
           • Robot is able to move right/both motors
           • Robot is able to determine when to turn right
             • Able to use the black line value, and determine the location of the line and turn in accordance to that
         • Robot is able to turn left
           • Robot is able to turn left/both motors
           • Robot is able to determine when to turn left
             • Effective use of the value of black line to know where the black line is
       • Robot is able to detect proper pct value
       • Robot executes specific command if PCT value associated to black isn't true
     • Robot is able to line follow
       • Robot is able to turn left
         • Robot is able to determine when the to turn left
           • Effectively knows how to find black line again
         • Robot is able to turn left motor/both
       • Robot is able to turn right
         • Robot is able to determine when to turn right
           • Ability to know how to find the black line again
         • Robot is able to turn right motor/both

4. Self prescribed criteria

   • Says hello randomly while line following
     • Needs to predetermine function/when to do it
       • Hard to determine when to do this however
     • Robot is able to turn
       • Robot is able to turn right
         • Robot is able to turn one motor right
         • Robot is able to move both motors right
         • Robot is able to determine when to turn right
           • Must use the black line following code involving the PCT value of the black line
       • Robot is able to turn left
         • Robot has to be able to turn one motor left
         • Robot is able to turn both motors left
         • Robot is able to determine when to turn left
           • Must use the black line following code involving the PCT value of the black line

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