My First Arduino 101 Car Controlled by BLE

Project tutorial

Components and supplies

Arduino 101

SparkFun Motor Driver - Dual TB6612FNG (1A)

Breadboard (generic)

Jumper wires (generic)

DC motor (generic)

LED (generic)

Resistor 330 ohm

About this project

Introduction

Some days ago I got my Arduino 101 kit that was given to me by Hackster and I decided to start doing projects and testing the new components that come in the kit. I decided to make a car controlled by Bluetooth and the Blynk application taking advantage of the Sparkfun motor driver.

I also used the Arduino 101 board that came included in the kit.

I use a pair of pololu engines with gearbox.

I also use an external smartphone battery that has a voltage of 5v and a current of 2600mAh that is enough for the entire circuit.

Result

The final design I liked a lot, I made it small and as I use the power bank instead of normal batteries like AA. I was able to save a lot of space and the weight of the final prototype was reduced. On the tires, use neoprene tires that stick very well to the ground and buy them in amazon. The third wheel is a crazy wheel that is super indispensable for the good movement of the car. The base of the cart is made of hard carton of an old notebook and a protoboard stuck in the carton, that's where the motor driver circuit is built. And I also put a few LEDs to make it look more colorful. These LEDs turn on and off randomly, the code is at the end if you want to check.

The control application of the car is done in Blynk and only added the Bluetooth function and added 4 buttons for the movement of the car (forward, reverse, clockwise rotation and counterclockwise), the application Is best handled in landscape view since ergonomics is lost in a vertical way.

Final

I am very happy with this project, I have now a new goal, to use this prototype and add functions like that of a line follower, and that of a robot dodge obstacles with ultrasonic sensors.

Code

Arduino car codeArduino

Please use with Blynk App

#define BLYNK_PRINT Serial
#include <BlynkSimpleCurieBLE.h>
#include <CurieBLE.h>

char auth[] = "5733e53afff240d79e49d7acc0849faa";

BLEPeripheral  blePeripheral;

const int DIR_A1 = 4;
const int DIR_B1 = 5;
const int PWM1 = 6;
const int DIR_A2 = 7;
const int DIR_B2 = 8;
const int PWM2 = 9;
const int luz = 13;
int pinValue1=0,pinValue2=0,pinValue3=0,pinValue4=0;
bool cambio=LOW;
byte random1;
const byte pin1=10,pin2=11,pin3=12,pin4=13;
long currentMillis;
long previousMillis = 0; 
bool estado=LOW;

BLYNK_WRITE(V1)
{
  pinValue1 = param.asInt(); // assigning incoming value from pin V1 to a variable

}
BLYNK_WRITE(V2)
{
  pinValue2 = param.asInt(); // assigning incoming value from pin V1 to a variable

}
BLYNK_WRITE(V3)
{
  pinValue3 = param.asInt(); // assigning incoming value from pin V1 to a variable

}
BLYNK_WRITE(V4)
{
  pinValue4 = param.asInt(); // assigning incoming value from pin V1 to a variable

}

void setup()
{
  // Debug console
  Serial.begin(9600);
  pinMode(DIR_A1, OUTPUT);
  pinMode(DIR_B1, OUTPUT);
  pinMode(PWM1, OUTPUT);
  pinMode(DIR_A2, OUTPUT);
  pinMode(DIR_B2, OUTPUT);
  pinMode(PWM2, OUTPUT);
  pinMode(luz, OUTPUT);
  pinMode(pin1,OUTPUT);
  pinMode(pin2,OUTPUT);
  pinMode(pin3,OUTPUT);
  pinMode(pin4,OUTPUT);
  delay(1000);

  blePeripheral.setLocalName("Blynk");
  blePeripheral.setDeviceName("Blynk");
  blePeripheral.setAppearance(384);

  Blynk.begin(blePeripheral, auth);

  blePeripheral.begin();

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

void loop()
{
  blePeripheral.poll();
  Blynk.run();
  digitalWrite(luz, HIGH);
 if(pinValue1==1)
 {
 digitalWrite(DIR_A1, LOW);
 digitalWrite(DIR_B1, HIGH);
 digitalWrite(DIR_A2, LOW);
 digitalWrite(DIR_B2, HIGH);
 analogWrite(PWM1, 255);
 analogWrite(PWM2, 255);
 }
 else if(pinValue2==1)
 {
  cambio=HIGH;
 digitalWrite(DIR_A1, HIGH);
 digitalWrite(DIR_B1, LOW);
 digitalWrite(DIR_A2, HIGH);
 digitalWrite(DIR_B2, LOW);
 analogWrite(PWM1, 255);
 analogWrite(PWM2, 255);
 }

else if(pinValue3==1)
 {
 cambio=HIGH;
 digitalWrite(DIR_A1, HIGH);
 digitalWrite(DIR_B1, LOW);
 digitalWrite(DIR_A2, LOW);
 digitalWrite(DIR_B2, HIGH);
 analogWrite(PWM1, 100);
 analogWrite(PWM2, 255);
 }

else if(pinValue4==1)
 {
 cambio=HIGH;
 digitalWrite(DIR_A1, LOW);
 digitalWrite(DIR_B1, HIGH);
 digitalWrite(DIR_A2, HIGH);
 digitalWrite(DIR_B2, LOW);
 analogWrite(PWM1, 255);
 analogWrite(PWM2, 100);
 } 

else if(pinValue1==0 && pinValue2==0 && pinValue3==0 && pinValue4==0 )
 {
 digitalWrite(DIR_A1, HIGH);
 digitalWrite(DIR_B1, LOW);
 digitalWrite(DIR_A2, HIGH);
 digitalWrite(DIR_B2, LOW);
 analogWrite(PWM1, 0);
 analogWrite(PWM2, 0);
 }
 random1 = random(10,14);
 currentMillis = millis();
      // if 10s have passed, check the sensor:
      if (currentMillis - previousMillis >= 500) {
        previousMillis = currentMillis;
        estado = ! estado ;                       // cambiamos el estado
        digitalWrite(random1, estado) ;            // escribimos el nuevo valor
          }

}