Mars Rover Expedition

Mars Rover Expedition

1. Variables

   • Search radius
     • How far to search
       • It only searches when it needs to
       • Doesn't keep searching in the same circle (moves forward when nothing is found)
   • Search direction
     • Tell robot which way to search
       • Full comprehensive search of area

2. Resources

   • Online
     • Blackboard
       • Learning course
     • EV3 ppt
       • Extra crash course
   • In person
     • Classmates
       • Nick
         • Coding
         • Catching up
       • Chloe
         • Report template
       • Jerry
         • What not to do
     • Teacher - Mr Stewart
       • Report guidance

3. Clearing obstacles

   • Mini Lego build
     • Lift with arms
       • Requires precision
         • Robot has proven to be inaccurate
           • Unreliable path
   • Cardboard Box
     • Push out of the way
       • Has to find path again
       • Can be triggered by anything
         • Arms
         • People on the track
         • Other robots

4. Robot design

   • Sensors
     • Touch sensor
       • To understand if the obstacle is moveable or not
     • Light sensor
       • To find the line
       • Less effective
         • One sensor = less accurate
     • Ultrasonic sensor
       • To know if there's an object in front of it
   • Unchangeable
     • Can't add sensors
       • Can't be made more accurate
         • Angle sensors
           • Easier to code for manual turns, i.e. moving and avoiding obstacles
         • Light sensors
           • Higher accuracy in tight bends and specific directions

5. Line following

   • Light sensor
     • Needs to be able to effectively detect line
       • Black line = 10-20 pts
       • Grey dots = 30-40 pt
         • Keep sweeping till light sensor < 45 pts
   • Comprehensive searching
     • 360 searching
       • Further searching after moving forward
   • Tight bends
     • General left bias necessary
       • Right sensor, left turning

6. Immoveable obstacles

   • Avoiding
     • Necessary to get correct angles
       • Relocate path
         • Correct length of travel

7. Complete path

   • Moveable object
     • Detection required
       • Ultrasonic sensor
         • Within particular distance of robot
           • < 7 cm
       • Touch sensor
         • No pressure on sensor
   • Immoveable objects
     • Detection required
       • Touch sensor
         • Pressure on sensor
       • Ultrasonic sensor
         • Very specific distance, otherwise moveable object will trigger
           • Might not be necessary
   • Line following
     • Criss crossy section
       • Detection required
         • Light sensor
           • Sense correct turns and intersects
             • Sense green

8. Map

   • Unchangeable
     • Moveable object
       • Carboard box
         • Chosen
       • Mini Lego build
     • Path
       • Black line (10-20 pts)
       • Grey dots (30 - 40) pts
       • Better paths and intersects highlighted with green

9. Light and sound show

   • Display
     • Button light
       • Green
     • Screen display
       • Big smile
   • Speaker
     • Celebratory sound
       • Bravo
   • Movement
     • Left to right movement
       • Both wheel twist at the same in different directions