This project is all about the wireless operation of a DC Motor. In this project, we will control the speed of a DC Motor. Direction of the rotation will also be controlled. Wireless facility is provided with the help of Bluetooth connectivity. An android handset is required to control the operation. As the name suggests that “Speed and Direction Control of DC Motor using Android Mobile Application” is controlling the speed of a DC motor with any mobile phone containing some medium of connectivity such as Bluetooth. Various terms related to this project can be discussed as follows. Since we are concern with the wireless application that is why we are using here a mobile phone to control the whole process. Now the question is why should we use a mobile phone? Which is the most suitable mobile phone? So the answer is that mobile is used only for a Bluetooth connection. We need not to carry an extra device for transmitting the data. This transmitter is already inbuilt in a mobile phone. Now come with the question of most suitable mobile phone, so it can be observed that Android phones are the most widely used phones. Android phones are very easy from the operating point of view. I-phones and windows phones are not as popular as the Android phones. So the Android phone will be used here.

1. #define BLYNK_PRINT Serial
#include <BlynkSimpleSerialBLE.h>
#include <SoftwareSerial.h>
SoftwareSerial SwSerial(10, 11); // RX, TX
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "c52bbc1504a2449d89667a2b320b2d47";
int pinValue;
SoftwareSerial SerialBLE(10, 11); // RX, TX
int enable=0;
int frwd=0;
int revr=0;
int spd=0;
void setup()
{
// Debug console
Serial.begin(9600);
SerialBLE.begin(9600);
Blynk.begin(SerialBLE, auth);
Serial.println("Waiting for connections...");
pinMode(5,OUTPUT);
pinMode(6,OUTPUT);
}
BLYNK_WRITE(V1)
{
pinValue = param.asInt(); // assigning incoming value from pin V1 to a
variable
// You can also use:
// String i = param.asStr();
// double d = param.asDouble();
Serial.print("V1 Slider value is: ");
Serial.println(pinValue);
}
BLYNK_WRITE(V2)
{
frwd = param.asInt(); // assigning incoming value from pin V1 to a variable
}
BLYNK_WRITE(V3)
{
revr = param.asInt(); // assigning incoming value from pin V1 to a variable
}
BLYNK_WRITE(V4)
{ enable = param.asInt(); // assigning incoming value from pin V1 to a variable
}
void loop()
{
Blynk.run();
// You can inject your own code or combine it with other sketches.
// Check other examples on how to communicate with Blynk. Remember
// to avoid delay() function!
if(enable==1)
{
if(frwd==1 && revr==0)
{
analogWrite(5,0);
analogWrite(6,pinValue);

2. Serial.println("forward");
}
if(frwd==0 && revr==1)
{
analogWrite(5,pinValue);
analogWrite(6,0);
Serial.println("reverse");
}
if(frwd==0 && revr==0)
{
analogWrite(5,0);
analogWrite(6,0);
}
if(frwd==1 && revr==1)
{
analogWrite(5,0);
analogWrite(6,0);
}
}
else{
analogWrite(5,0);
analogWrite(6,0);
}
}