This project is presented to show ease of designing an RC car in a short period of time with little spending money. In my example I am running one set of wheels as my others unfortunately snapped - so the tail end drags. But If I had the chance again I would buy another set as they are not overly expensive.
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Step 1: Using Both 5V and 3V Outputs
In this project you will need two different voltage outputs as the 5V will run most of the circuit and the 3V running solely the Bluetooth. When you use the bluetooth module (HC-05) it has 4 pins (3V, Gnd, Tx, Rx) and when hooking it up you hookup the Tx and Rx to the opposites in the 1/2 position on the arduino
Tx goes to Rx
Rx goes to Tx
Step 2: Setting Up the H-Bridge
To set up the H-Bridge chip you need to fill 8 positions a side (in order: enable, Direction 1, Motor 1, Ground, Ground, Motor 2, Direction 2 and Power to the motors). The same order is in reverse for the other side except the power to the motors is power from the Arduino
Step 3: Setting Up the Lights
Setting up the lights includes just having a ground wire, a 220 ohm resistor and an output from the arduino itself. Put it on all four sides to get lights that turn on and off as you change direction.
Step 4: Piezo Buzzer (Backwards Noise)
As with the lights, just put the power of arduino through the buzzer and a ground wire on the other side.
Step 5: Change It Up (Code)
This car was really easy to set up in a minimal amount of time. Most users can easily figure out the setup with the arduino only having three different mechanics in this car (motors, bridge chip and bluetooth), it can easily be changed to fit in more if need be, though you may need more pins or be a little more adept at coding.