The STM controller notes the speed of the axle, and compares it to the speed it has commanded the axle to turn. In the case of these cars, the motor controller is an STM microcontroller that has motor control capabilities built in. Sensed wheel speed is used to generate an error signal or correction factor for the speed command sent to the motor. Pulses generated when individual gear teeth pass by the Hall sensor get fed back to the motor controller as a measure of wheel speed. The teeth of the driven gear pass next to a Hall effect sensor which is used as a way to sense wheel velocity. Each motor drives a wheel through a bevel gear. That is what the Hall effect switches do. To make sure each motor spins at exactly the right speed, the controller must measure the speed of rotation of each axle. 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.
#Anki overdrive android#
Wifi required for battles between iOS and Android devicesRobotic race cars make clever use of software and infrared optics to follow lines slyly hidden on the track. Each player must have a compatible iOS or Android Device
#Anki overdrive download#
Simply open the box, build one of 8 unique battlefields, and download the Anki OVERDRIVE app on your iOS or Android device. The Anki OVERDRIVE Starter kit has everything you need to hit the track racing. Or go head-to-head with AI controlled Commanders in a quest to become champion of the Anki OVERDRIVE Tournament
#Anki overdrive trial#
Challenge friends in Battle, Race, Time Trial and King of the Hill game modes 2 robotic Supercars, Skull and GroundShock, feature their own unique weapon systems and the technology to think for themselves 10 Anki OVERDRIVE track pieces allow you to build and rebuild up to 8 epic battlefields in seconds On the road to victory kick your skills into overdrive by customising your Supercars speed, weapons, and defences through in-game upgrades.Anki OVERDRIVE brings futuristic battle racing roaring to life. Challenge friends in a variety of game modes, or, go head-to-head with AI controlled Commanders in a quest to become champion of the Anki OVERDRIVE Tournament. Using your mobile device, take command of real robotic Supercars on epic battlefields you construct in seconds. Battle and race the robotic Supercars of the future in Anki OVERDRIVE
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