THE LAST BLOG-intro 2 rob.

The big thing about building the robot is really the best part because its were you can let out your inner 'child' and tinker with Lego's. Also the class and the chapters of homework teach how to effectivly build a robot to the point were a book of instructions dont need to be within arms reach incase you mess up the robot and are creating your own robots. The things that's are the most important in building the robot is the following

A) weight- and its division throughout the robot
note- look at the bottom/underside and see if the robot is sagging, if it is your wheels are too spread and the weight is to much (mostly in center and also not spread as well as possible).

B) gears - speed vs torque
If you set the gear ratio in an attempt at speed and go to fast, the small gear skips and sounds like clicking and wont really move

C) sensor placement
you need to leave room to put on sensors and know how to make the attatching section so it can be made almost anywere on the robot.

D)TRIAL AND ERROR

just download the program and run it, then use your results to alter the program by edititng values or checking out the section were the robot fails at, then after fixing it simply try again and repeat the process, after finishing test the highest motor power usable as an input into the program or other data to find just what the 'limit' is. The programmign requires simple blocks so remember, turns = motor block
forward = motor block OR move block (easier to use move block)


The sensors that are needed to attatch are the following

LIGHT
the sensor reads the light value by testing how much light returns to its sensor while it is contantly sendign out light, if it is a low value= dark high value = light
SOUND
records the volume or pitch of the soundwaves entering it and assignes them a value. usually used in form of detecting a clap or sudden noise at a certain threshhold
TOUCH
this sensor is just how it sounds it can tell when its touched and can be set to continue the program when either PRESSED, RELEASED or BOTH befor continuing.
ULTRASONIC
uses ultra sound to regester distances between objects ahead of it while not dirrectly needing to interact of touch them.

chapter 14 (clasic Projects

This chapter deals with basicly, what we did in the 'line tracking' activity. it talks about the techniques that can be useful for the following of a line and detecting/avoiding objects. One of the listed techniques in this chapter is the atching and usage of an ultrasonic sensor to detect an edge of a peice of tape on the floor, this is done by putting the sensor around ground level this will allow the subjected robot to locate the edge because there would be a change in hight, or distance as the ultrasonic would 'assume', from the sensor and the object being dettected, in this case namly the surface of he floor, this method works if you use an untra-sonic sensor or the change in the light reflected back from a light sensor, on a darker surface being less and a lighter/more reflective surface being more. This chapter's mainly discussed project's base ideas may be boring (to the exream in some locations) but are quite effective.

TRACTOR PULL!

The tractor pull...
The test of the strong...
The challenge of the men...
and the robotics classed!

in the tractor pull challenge we need to design the robot to be able to pull the most weight that it can!
being directly after the drag race, its child's play to reverse the gear locations to go for strength not speed!

gear trains are gonna be a must to win this challenge! all you need is to pull the 'sled' filled with as many of the weights as it can while still moving forward.

ITS ON!

DRAG RACE!!!!

In the drag race challenge, you have to design your robot to go the fastest that it can down a strait line and acheive the fastest time of traveling a 3 meter length.

To do this challenge, and achieve first place, a very long gear chain which will allow a extremely low gear ratio to maximize rotations and obviously increase the motor power to 100% to the motors.

we will also need to increase the weight in the front slightly to stop the robot from flipping over.

Gears and Speed

In the gears and speed investigation we had to determine which of the two hypotheses given to use were indeed correct, or at least which had a greater extent of accuracy.

The 2 hypotheses are in the picture to the right.

The correct hypothesis was found by compairing gear ratios and the distance traveled over three seconds of movment with 100% motor power and averaging them to find the average distance traveled, and then dividing by three (the amount of time) to produce the average speed.

The hypothesis was actualy Hypothesis that was correct ended up being Hypothesis B because it had a smaller range of error produced.

Get in Gear Investigation

if the driving gear was bigger than your driven gear then the robot would travel faster because the rotation of the driving gear once would cause the driven gear to rotate multiple times due to each turn being for instance, 36 teach and 12 teath on the other so that each time 36 teath turned around completly, 12 teath turned around 3 whole times. on the flip-side, if the driven gear was bigger than your driving gear then the power in the wheels would be stronger though causeing the wheels to be slower and shorter distance traveled if using a rotation sensor because each 3 turns of a 12 teath would cause only one wheel turn if the driven wheel was a 36 tooth gear.

History was made by R.O.B.-the documentary

History was written today when R.O.B. V2.0®(*)(**) became the 1st bot in the history of I.S.K.L. to be given a perfect score in the second robot course challenge. R.O.B V2.0® was the first and only robot to finish the course in one go, as of the 19th of November. Other robots like the big Goliath which was constructed by Bart and Kenny failed to perform when it really counted, despite doing really well in all of its previous trial runs, and ended up toppling down, literally. They say that David triumphed over Goliath, but he was out sick today so instead victory went to R.O.B V2.0®, who beat all the other robots which were still doing their trial practices after having failed at least once in most cases, and went on to finish the obstacle course in its first and only try. There will be other robots to complete their obstacle course challenge by next class but this day truly belonged to R.O.B V2.0®.





But now, the victor against all odds, will never run again, having been destroyed and dismantled by a separate team for the new unit-Getting in Gear which started today.





May he rest in peace, for he was a great robot-R.O.B. V2.0

*patents and copyrights pending **copyright on base design- "the treader©" has been passed(#)





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