The USB hub has a cable which may be used on the car, but a shorter 6″ USB 3.0 B Right Angle to A cable is wired up in the video. Preliminary wiring adds an extension cable for the steering servo to the VESC-X. The platform is mounted on 1 3/4″ 3/16″ hex 4-40 F/F standoffs with 4-40 3/8″ screws. The ZED is mounted using a 1/4″-20 3/8″ screw. Both the battery and the router use the same mounting pattern so that both can be on the vehicle, or the battery alone. With the judicious application of 3M Double Lock Fastener, both the battery and the router are mounted on the platform, as shown in the video.
The ZED provides stereo vision capabilities to the vehicle. There is a mounting hole for the ZED camera on the top platform. There are circuits which can keep the power supply clean of course, but for now the two battery solution seems like a good choice. Having two batteries eliminates that issue. Motors tend to “dirty up” power supplies, and under load can cause voltage drops and spikes. Using two batteries on the vehicle, one for the motor and the other for the sensors and electronics, keeps the sources “clean”. There is a 5V USB outlet which is currently not used. The 12V outlet drives both the USB hub and the router. The battery is 18000 mAH with three output voltages. This may be optional depending on your circumstances. The MIT RACECAR uses the router to get a better signal and boost connectivity with the car.
The upper platform has three major components: In the video, the IMU is added to the lower platform using 1/4″ standoffs and 4-40 screws with nylon washers. Fortunately there are several different spring sets available for the car. This has the effect of raising the ride height and stiffening the suspension.ĭepending on the total weight being added, it may be prudent to switch out to stiffer springs. On the rear springs add one large spacer. On the front springs, add two small spacers and a medium spacer. The TRAXXAS Rally comes with additional spacers. Time to address that issue.īefore continuing the build, we add spacers to the front and rear spring assemblies. With the addition of the extra weight from the platforms, computer and sensors, the RACECAR is getting a case of “droopy drawers”. After putting together the lower platform of the Jetson RACECAR, the next step is to assemble the upper platform.
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