This is how to make an RC car for around 40$(27$ w/ uno clone).
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Step 1: Parts
Step 2: Programing
Here is the code:
Step 3: App
The app is simple, UP, DOWN, RIGHT, LEFT, UPRIGHT etc. ,also a slider. Arduino Bluetooth RC Car website.
2.3.3 and up.
Step 4: Wiring
Wire the robot as above, then it should be ready.
Thank you for reading.