In this challenge, you will have 2 rounds during the challenge. One being autonomous which you will program your robot to move around the playing field to collect a ball and put it into a goal. The second round is tele-op. In tele-op you will be using a remote control to manually control your robot to collect particles.

Algorithm

I didn’t spend enough time on the coding as I needed to, I spent too much time modifying my robot physically and not enough time spent towards trial and error with the coding part of the challenge. The main code that got me 5 points every round was coding in a taunt, it was worth 5 points which still helped my teammate and I get in the lead.

Build Plan

My build plan was based off the idea of how a forklift works. The main mechanism was used for lifting the particles and moving them where they needed to be. This helped out in the end by lifting the particles so the other team couldn’t knock the particle out of the reach of my robot. In the end the mechanism did have a few failures, mainly the arm collapsing while trying to pick up a particle, but most of the time it did properly work during the challenge.

Building Progress Reflection

With this being my first prototype, I was very excited for it to work. The main problem with the mechanism was the string kept slipping.

After changing the strings for rubber bands, I thought this would work, then the rubber bands kept breaking on me. The rubber bands were old and would eventually break once in use.

A classmate brought in an extra add-on kit for the EV3. She let me use the tank treads the ultimately fixed my problem with the tread not working.

This code wasn’t fully created, which in the end the robot didn’t collect any particles. Although I did code it to try and find a yellow ball on the field, but I didn’t have enough time to tell it what to do once it was found. What mainly got me points during the 1st round was taunting. It was 5 points, but it was better than no points at all. A link to my code would be found here.

The easy part about this challenge was the tele-op round. I could control the robot where I wanted it to go and collect particles. The hard part of this challenge is either coding the robot or fixing my lifting mechanism.

In the Fourth Challenge you will have to put a blue ball into Mr. Vanderhoof’s cup and a red ball into Mr. Patterson’s cup. The robot has to put the proper color ball into the proper cup 6 times at random.

Algorithm

When I start the program, it will move motor A up, then it’ll look for wither red or blue, depending which ball comes at random. Then whichever ball is picked up, it’ll read that color and turn accordingly.

Build Plan

Even though I tried many different varieties of solutions to complete the challenge, I wasn’t able to complete the challenge, the mechanism that I burned most of my time on was for nothing since it didn’t work.

Building Progress Reflection

I spent too much time on the building aspect on it because I couldn’t complete the challenge. I wish I would’ve known not to spend as much time as I has, so learn from my mistake and don’t spend too much time on the building process of the robot.

In this challenge, you will change the design of your robot in order to lift a jug full of water tied onto the robot with a string so that you can pull 4 joules worth of work. The use of gears will help get more power out of your little motors by using what’s called a gear ratio. Using gears will help take stress off the motors and get more power out of the motors then what you would usually.

Algorithm

Building Plan

As I was going through the process of testing the robot, I was mostly adding more support and making the robot lift more efficiently. At the start of the challenge, I didn’t realize how much I needed to change the design of the robot until I realized that it had to do a different task and the robot won’t be efficient enough until I build a new design of the robot that will lift the jug efficiently.

Building Progress Reflection

Programming the robot was a little challenging because of what I wanted the robot to do after lifting the jug. After it lifting the jug, I wanted the b and c motors to move backwards when i pressed the down button on the robot, but i couldn’t get the program to move on after the distance sensor was less than or equal to 6 centimeters. I fixed this by using the “repeat until” instead of the “if, do” block.

When the robot lifted the jug, it used about 4.28 J to lift the jug. The robot also use about 21 mW of power to lift the jug with the two motors. The robot ended up having a 26:20 gear ratio in the gear boz so that it’ll lift the jug with less power.

There was no really easy part this challenge, the hardest part was building the robot so it’ll complete the challenge in an orderly fashion. The programming aspect was hard as well because of the decisions the robot had to make based on its outer surroundings.

For challenge 1, you will be building the Lego Mindstorms EV3 TRACK3R robot and using the Open Roberta software to drive the robot straight on a board without going over it, as pictured below.

Algorithm

The robot repeats driving until the color sensor doesn’t sense brown.

• 1: Drive at 50% speed
• 2: Repeat it until the color sensor detects white

Building Plan

The robot you will be building is called the TRACK3R. The instructions and information for the robot can be found at Lego’s website.

Program

Pictured below is the program I used for completing the challenge. I made it specifically to use with the color sensor.

The code says to repeat driving forwards until the color sensor will detect white. I used the color sensor instead of driving a certain distance because it doesn’t matter the length of the track, it’ll still stop before going over it.

Building Process Reflection

The components I added were the color sensor to the front of the robot to detect when the robot does not sense brown in my programming. I also changed the mechanism in where the color sensor attaches to the robot so the sensor can go lower to the ground.

The first problem I ran into was the robot wasn’t moving all the way across the board, so I then measured the length of the board and also factored in the length of the robot which has to start in front of the board, not on the board. Then again, the robot was still only making it part way.

I then saw that I could add a color sensor. I then changed my code to repeat driving until the color sensor did not sense brown, the color of the board. There I ran into another problem, the robot would go over the board now. After inspecting the robot, I may have found a reason why it was going over the board, maybe the color sensor was not fast enough to detect the change in color. I then modified my color sensor to extend out further. Once I did that, the robot was still going over the board.

After a few more runs along the board, I then figured out the source of the problem, the color sensor was not detecting the ground until the robot went over the end of the board, which at that point the robot teeters between the board and ground. I moved the color sensor closer to the floor, which fixed the problem and the robot stopped at the end of the track without crossing the lines.

The most difficult part of this build was most likely troubleshooting the color sensor since I didn’t know exactly what was going wrong, I had to observe what was going on with the robot at the time it should be stopping and detecting that the board was not there anymore. What worked well, for the most part, were the motors and structure of the robot. The robot had a consistent run which was good for troubleshooting and testing since it ran the same everytime which was one less variable to consider during the troubleshooting process which made it easier to find the source of the problem.