The STM MCU implements a velocity feedback loop, driving the motors faster or slower based on the difference between the commanded velocity and the sensed velocity. Hall sensors on the PCB detect the passing of gear teeth in the drive, feeding back this information to the STM motor controller. There can be changes in the tire friction as the car moves, as well as other variables that can slightly change the motor speed.Ī close-up of the wheel-drive motors and gearing shows how the Overdrive cars steer and get power. The reason is that just putting in a specific amount of motor current won’t guarantee that the motor will spin at a precise velocity. To begin, the speed of the motors can’t be controlled precisely enough to steer the car without some kind of closed-loop control. (One widely followed teardown site analyzed the Overdrive cars and botched the explanation of components related to the motor control, probably because those involved didn’t really understand motor control techniques.) It is worth examining how the motors are probably controlled. So the car steers by slightly increasing or decreasing the speed of each rear wheel as need be. Instead, the car uses two tiny electric motors, one to power each of the rear wheels. Once it’s out, the mechanism by which the car steers becomes clear. The PCB sits in the chassis sandwiched between the two halves of the car shell so it comes out easily. Removing the top of a car exposes the circuit board, the chassis, and a large ballast weight. Noteworthy in this view is the chunk of metal used for weight ballast, the multicolor LED giving battery charge status, and the LEDs that help simulate weapon strikes. Under the covers Removal of the car shell reveals that the Overdrive cars are basically circuit boards on wheels. The cars are powered by rechargeable lithium batteries, and the set comes with a recharging station where cars sit until their batteries are ready. To flawlessly traverse every layout thrown at it, each car takes a training lap before a race and basically memorizes the track using a built-in optical sensor to sense track position. An interesting feature of the track is that its sections use magnets to click together, and the track can be configured in a variety of racing layouts. The Overdrive starter kit we analyzed contains sections of track that can go together in various ways and can even include jumps. The only thing I can think is that the standard starter set doesn’t come with any barriers for the corners where as the Fast and Furious does.Robotic race cars make clever use of software and infrared optics to follow lines slyly hidden on the track. I would 100% recommend this to anyone who is contemplating it! It’s so worth it! Oh and the cars!! The cars are very durable and nicely detailed! They look brilliant! The box for both sets are really durable and perfect for storing the track and cars in when not being played with! I’ve even unlocked Nos which really kicks the back end out in a sharp corner! The selection of weapons is brilliant wether it’s a long range high powered sniper or an area of effect emp! The in app money you earn buys you better weapons and abilities! You earn more in the campaign, but you also earn money racing friends! But the track is super durable and it snaps together so easily! It’s so easy to change the layout! I have always loved scaletrix sets and wasn’t sure how I felt about this. We have the starter set and the Fast and Furious starter set! And they are both awesome! 4 cars is so much better! Racing with friends or against the Ai or both at the same time! It’s an excellent set! And adding to it just makes the fun last longer! The two apps each have separate campaigns and so there is hours of fun you can have even if the wife doesn’t want to race you!
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |