![]() ![]() 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. Your current OverDrive loans will be waiting for you in Libby when you sign in with your library card.Robotic race cars make clever use of software and infrared optics to follow lines slyly hidden on the track. Note: If you continue to have trouble with the OverDrive app, you may want to consider trying our newer app, Libby, to enjoy digital titles from your library. Contact support for more help, and let them know you tried all the steps in this article.On a touchscreen device: Press and hold the Power button and swipe down on the screen.On a desktop: Right-click on the Start menu and select Shut down or sign out, then Restart.On a touchscreen: Press the back button, then swipe down from the top of the screen and drag the app to the bottom of the screen.On a desktop: Click the X icon in the top-right corner of the app window.Make sure you're using the latest version of the OverDrive app by going to the Windows Store and checking for updates.If you're in a country where the OverDrive app for Windows 8/10 is still available: If you can't use the OverDrive app, we encourage you to try our newer reading app, Libby. The OverDrive app for Windows 8/10 can only be used in select countries. ![]()
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