Review on 🚗 VKmaker Smart Robot Car Chassis Kit with Speed Encoder, Ultrasonic Module, and Battery Box - New Avoidance Tracking Motor System 2WD. Includes Tutorial CD. by Brandon Vox

As mentioned earlier, there are a few bugs in this set. The problems I have found are as follows: 1 - The holes in the roller are too big for the offset fasteners. 8 washers 3M perfectly fixed it. 2 - The correct holes are not drilled in the battery holder. A little drill fixed everything. The mounting bolts are too small for the holes and the extra washers fixed that. (Instead of cap screws, it should have pan head screws so the end batteries are flush with the battery case.) 3 - The battery case wire doesn't have pigtails to connect to the motor control board, so I cut the end off. soldered into wires connecting red to red and black to black. I soldered the wires to make sure I had a good connection and shrunk them. 4 - The drive motor schematic shows the use of A1-A4 for IN4-IN1. That would be fine, but the test code that came with the kit uses pins 14-17, meaning they were really meant for A0-A3 connections. When I first turned it on, it was spinning in a left circle. 5 - The test code had to be changed depending on how my motors were spinning. I have pinRF=14, pinRB=15, pinLF=16 and pinLB=17. After changing the cables to A0-A3 and swapping front/rear left/right, everything worked. This kit was fun to build and the video was very helpful. A screenshot of the sensor with the wiring completed would be helpful. It was fairly easy to find documentation for the motor controls and touchscreen on the internet. The biggest problem I had was determining that A0 on the touchscreen corresponds to pin 14 in the code. The test code will prove the details work, but it's just a platform jump. Now I will configure its operation and possibly add additional sensors. There are so many possibilities, that's the whole idea! I plan to use them for high school students after they master some basic Arduino board skills. The price makes it much easier to provide each student with their own set of tools to work with. Minor issues with the kit are more "learning opportunities". HIGHLY RECOMMENDED!