We picked a Fast Lane 1:24 RC Car. This car is prefect for this project, as it has all features that we are looking for, such as headlight and underglow LEDs with enough room to put our board inside.

After taking it apart, identify the wires for LEDs and motors.  The desoldering them off the board and replace them with Arduino board and motor drive module.

In this step, solder the steering motor to "MOTO A" and back motor to "MOTO B" on the motor driver module. Solder jumper wires to headlight & under-glow LEDs on both +ve & -ve side.

Putting on the SAM01 Arduino Robotics Board and connecting the jumper wires as following.

PIN 3 - INT1 for Motor A (Steering Motor)
PIN 5 - INT2 for Motor A
PIN 6 - INT3 for Motor B (Drive Motor)
PIN 9 - INT4 for Motor B
PIN 10 - Headlight LEDs
PIN 13 - Under-glow LEDs

Now it is time for testing all the connections. I have made Sam_RC_Car_Test.ino for ease of testing.  Upload the ino file with Arduino IDE.  

** Set board to "Arduino Nano" in Arduino IDE** 

#define MA1 3
#define MA2 5
#define MB1 6
#define MB2 9
#define BOTTOM_LED 13
#define FRONT_LED 10

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(MA1, OUTPUT);
  pinMode(MA2, OUTPUT);
  pinMode(MB1, OUTPUT);
  pinMode(MB2, OUTPUT);

  pinMode(BOTTOM_LED, OUTPUT);
  pinMode(FRONT_LED, OUTPUT);
}

void loop() {
  // right
  analogWrite(MA1, 255);
  analogWrite(MA2, 0);
  // forward
  analogWrite(MB1, 150);
  analogWrite(MB2, 0);
  
  delay(3000);
  // left
  analogWrite(MA1, 0);
  analogWrite(MA2, 255);
  // stop
  analogWrite(MB1, 0);
  analogWrite(MB2, 0);
  delay(3000);

  // middle
  analogWrite(MA1, 0);
  analogWrite(MA2, 0);
  // backward
  analogWrite(MB1, 0);
  analogWrite(MB2, 255);
  delay(3000);
  // Testing LEDs
  digitalWrite(BOTTOM_LED, HIGH);
  digitalWrite(FRONT_LED, HIGH);
  delay(100);
  digitalWrite(BOTTOM_LED, LOW);
  digitalWrite(FRONT_LED, LOW);
  delay(100);
  
}

After the connections are verified.  We are ready to connect with Blynk through BLE.

First upload the file Sam_Blynk_RC_Car.ino with Arduino IDE.

#define MA1 3
#define MA2 5
#define MB1 6
#define MB2 9
#define BOTTOM_LED 13
#define FRONT_LED 10

//#define BLYNK_USE_DIRECT_CONNECT

// You could use a spare Hardware Serial on boards that have it (like Mega)
#include <SoftwareSerial.h>
SoftwareSerial BLESerial(10, 9); // RX, TX

#define BLYNK_PRINT Serial

#include <BlynkSimpleSerialBLE.h>


// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "yourAuthToken";
bool turbo;

void forward(int speed)
{
  analogWrite(MB1, speed);
  analogWrite(MB2, 0);
 // Serial.println("Speed: ");
 // Serial.println(speed);
}

void backward(int speed)
{
  analogWrite(MB1, 0);
  analogWrite(MB2, -speed);
  // Serial.println("back speed: ");
  // Serial.println(speed);
}

void right(int speed)
{
  analogWrite(MA1, speed);
  analogWrite(MA2, 0);
}

void left(int speed)
{
  analogWrite(MA1, 0);
  analogWrite(MA2, speed);
}

BLYNK_WRITE(V0)
{
  int pinValue = param.asInt(); // assigning incoming value from pin V1 to a variable
  Serial.println(pinValue);

  if(pinValue >= 0)
  {
    if(turbo)
      forward(pinValue);
    else if (pinValue == 0)
      forward(0);
    else
      forward(pinValue * 0.7 + 30);
  }
  else
  {
    backward(pinValue * 0.7 - 30);
  }
  
}

BLYNK_WRITE(V2)
{
  int pinValue = param.asInt(); // assigning incoming value from pin V1 to a variable
  
  //Serial.print("Left ");
  //Serial.println(pinValue);
  if(pinValue)
    left(255);
  else
    left(0);
}

BLYNK_WRITE(V3)
{
  int pinValue = param.asInt(); // assigning incoming value from pin V1 to a variable
  
  //Serial.print("Right ");
  //Serial.println(pinValue);
  if(pinValue)
    right(255);
  else
    right(0);
} 

BLYNK_WRITE(V1)
{
  int pinValue = param.asInt(); // assigning incoming value from pin V1 to a variable
  
  if(pinValue)
    turbo = true;
  else
    turbo = false;
  
}

  
void setup()
{
  // Debug console
  Serial.begin(115200);

  Serial.println("Waiting for connections...");

  // Blynk will work through Serial
  // Do not read or write this serial manually in your sketch
  BLESerial.begin(9600);
  
  Blynk.begin(BLESerial, auth);
  pinMode(MA1, OUTPUT);
  pinMode(MA2, OUTPUT);
  pinMode(MB1, OUTPUT);
  pinMode(MB2, OUTPUT);

  forward(0);

  turbo = false;
}

void loop()
{
  Blynk.run();
  
}

Copy the Auth Token back to Sam_Blynk_RC_Car.ino.

char auth[] = "yourAuthToken";

Turn on the RC Car's power and search for SAM01 in Blynk App by following the steps below

It is all set and ready to GO!!!