This is my Fifth LEGO MOC and the First to use Mindstorms EV3. It was completed on 1/28/2014. It featured drive and steering with Remote Control and a Driving Around Program.
About this creation
After getting the LEGO MINDSTORMS EV3 set in October I have finally made my first official model with it. First, I will point out that the programming was way harder than the building. Second, This creation is really a test model for my future EV3 creations. I used the EV3 because I wanted to add sounds to my vehicles, and I did, on one of the programs.
I have made two programs for this model. I made one for remote control and another for driving around. The RC Program worked extremely hard to make: I first used a program from Daniele Benedettelli's book, which was extremely complex. It uses math blocks, variables, arrays, etc. which I have no idea on how to use them. At the end, the ResetSteer program didn't work the way it should, and it can't drive, it can only steer. My only choice after that is to make up my own.
I first tried to make my program a Multitasking Program, which did not work. It can do a few tasks, but after that it keeps driving and won't stop, so I knew I have to get an idea now.
I first searched the Lego Mindstorms Website but found none, so I looked on YouTube for some Mindstorms RC Cars. Thanks to YouTube user Josef Nyms, I finally got it to work with a switch block inside a loop block, which he showed me. The only problem is that some of the functions cannot be done simultaneously in a certain order.
The Driving Around Program was fairly easy. It used the IR Sensor to measure Proximity and it backs up near a wall, and it can also play sounds. The only disadvantage is that sometimes the sensor doesn't detect anything, so it crashes into it. But still, it worked very well.
The building process was straightforward, just like my previous two MOCS. It had a red body and a white roof, with most of the body covered with panels and liftarms. I used 62.4x20 wheels without a suspension, because I think those wheels are simply not the wheel for complex suspensions, because they've never been used on a proper suspension as far as I know. It used 2 EV3 Large Motors (not to be confused with the Power Functions L-Motor) as propulsion motors and they both had 1.66:1 Reduction (A z12 gear meshing a z20 gear) and there was no differential. The steering system is steered with a EV3 Medium Motor (not to be confused with the Power Functions M-Motor) and is programmed to rotate 45 degrees, which is another advantage of the EV3, because the steering system can be programmed to rotate the degrees you want it. The IR Sensor was located in the cab next to the driver's seat, and the EV3 Brick is located in the rear section of the cab, with a door to access it. I used stickers from various Technic sets, for example, 42005 and 9394, and it looked beautiful. I was very satisfied with its look.
Overall, I am very satisfied with everything about this model. The propulsion motors had no stress and the programs worked flawlessly.