Friday, 24 July 2015

Spider Challenge - The Finished Product

Activity Details:
Task: Choose an animal and study its movements. Create and program a robot to demonstrate the behaviour of an animal e.g. a tail wagging puppy or a jaw snapping crocodile
Start date of task: May 20th 
End date of task: July 24th

    • FACTS ABOUT OUR ROBOT:
    • Sensors used: ultrasonic and light
    • Animal: Spider
    • He is called Kevin "Kev the Chev" Chevy
      • "Net-casting spiders have enormous, compound lenses that give a wide field of view and gather available light very efficiently. The lenses can concentrate available light more efficiently than a cat or an owl. Each night a large area of light sensitive membrane is manufactured within these eyes (and rapidly destroyed again at dawn)." - The LIGHT SENSOR on this robot is able to detect the amount of light in it's surroundings similarly to the way a spider is able too.
      • "However, most spiders that lurk on flowers, webs, and other fixed locations waiting for prey tend to have very poor eyesight; instead they possess an extreme sensitivity to vibrations, which aids in prey capture. Vibration sensitive spiders can sense vibrations from such various mediums as the water surface, the soil or their silk threads. Changes in the air pressure can also be detected in search of prey." - The ULTRASONIC SENSOR on the robot is able to pick up objects that are close by

      • Wikipedia, (2015). Spider anatomy. [online] Available at: https://en.wikipedia.org/wiki/Spider_anatomy#Eyes.2C_vision.2C_and_sense_organs [Accessed 24 Jul. 2015].




Spider Challenge - Animatronic - Building


Activity Details:
Task: Choose an animal and study its movements. Create and program a robot to demonstrate the behaviour of an animal e.g. a tail wagging puppy or a jaw snapping crocodile
Start date of task: May 20th 




LEGS AND ORIGINAL BODY:
LONG CURVED LEGO PARTS WERE USED TO MAKE THE 8 LEGS OF THE SPIDER. VERY LITTLE ABOUT THE STRUCTURE AND POSITIONING OF THE LEGS CHANGED.
THE LEGS OF THE SPIDER WERE NOT INTENDED TO MOVE THE SPIDER OR CONNECT TO A MOTOR TO MOVE SO THEY REMAINED FLAT.
LATER ON GEARS WERE ADDED ON THE SIDE TO ASSIST SLIDING AND MOVEMENT OF THE BOT









GEARS AND FRONT MOTOR:
 THE FRONT GAP BETWEEN THE TWO INNER SPIDER LEGS WAS NOT LARGE ENOUGH TO FIT TWO WHEELS TO MOVE THE ROBOT FORWARD. AS AN ALTERNATIVE A PATTERN OF INTERLOCKING GEARS WERE USED. 



 SECOND MOTOR:
THE SECOND MOTOR OF THE SPIDER WAS ADDED FOR TWO REASONS; FIRSTLY BECAUSE WE FELT LIKE THE SPIDER WAS BECOMING TOO HEAVY FOR IT TO MOVE WITH JUST THE ONE SET OF COGS PUSHING IT FORWARD AND SECONDLY, BECAUSE THEN IT WOULD BE MORE ROOM AND OPPORTUNITIES TO ATTACH THE SENSORS AND SPREAD OUT THE 8 SPIDER LEGS.





 SENSORS:
AFTER THE ADDITION OF THE SECOND MOTOR IT BECAME CLEAR WHERE THE SENSORS COULD BE ATTACHED.

SMALLER LEGO PIECES WERE USED TO FASTEN THREE SENSORS TO THE FRONT, TOP AND SIDE.

ORIGINALLY THE ROBOT HAD THREE SENSORS; ULTRASONIC, LIGHT AND SOUND.
BUT AFTER DIFFICULTY WITH THE SOUND SENSOR'S PROGRAMMING IT WAS NO LONGER INCLUDED IN THE FEATURES AND CHARACTERISTICS.











WHEELS (SPIDER):


THE AXLE OF THE WHEEL WAS ORIGINALLY PUT IN THE MOTOR BUT WHEN IT BECAME TOO COMPLICATED TO PROGRAM IT WAS PUT IN THE ROUND HOLE ON THE SIDE SO IT COULD TURN ITSELF AS IT MOVED.












WHEELS (BATTERY):


Large back wheels added to the back of the battery pack. The design changed from the smaller wheels starting at the back (left side) and no wheels on the front (right). It was changed to the photo above so that the spider could pull the battery along without the wires being held up.