Arduino Control DC Motor via Bluetooth




Hi guys,
In this project we will control a DC motor with a smartphone via bluetooth. This project is great to learn more about:
-DC motor
-Interfacing Arduino with your smartphone
-Bluetooth module
-L293D
Control DC Motor




you can visit my website for more electronic projects, interesting news and tips:
http://randomnerdtutorials.wordpress.com/

Step 2: Schematics and common mistakes

Two common mistakes:
-You need to remove the RX and TX cables when you’re uploading the sketch to your Arduino.
-Sometimes people connect the TX from the bluetooth module to the TX of the Arduino… that’s wrong and it won’t work. Make sure you connect it properly, the TX into RX and the RX into the TX.
Schematic Control DC Motor
Note:
If the HC-05 Bluetooth Module asks for a password, It’s ‘1234’.

Step 3: Arduino Code

/*
* created by Rui Santos, http://randomnerdtutorials.wordpress.com
* Control DC motor with Smartphone via bluetooth
* 2013
*/
int motorPin1 = 3; // pin 2 on L293D IC
int motorPin2 = 4; // pin 7 on L293D IC
int enablePin = 5; // pin 1 on L293D IC
int state;
int flag=0; //makes sure that the serial only prints once the state
void setup() {
// sets the pins as outputs:
pinMode(motorPin1, OUTPUT);
pinMode(motorPin2, OUTPUT);
pinMode(enablePin, OUTPUT);
// sets enablePin high so that motor can turn on:
digitalWrite(enablePin, HIGH);
// initialize serial communication at 9600 bits per second:
Serial.begin(9600);
}
void loop() {
//if some date is sent, reads it and saves in state
if(Serial.available() > 0){
state = Serial.read();
flag=0;
}
// if the state is ‘0’ the DC motor will turn off
if (state == ‘0’) {
digitalWrite(motorPin1, LOW); // set pin 2 on L293D low
digitalWrite(motorPin2, LOW); // set pin 7 on L293D low
if(flag == 0){
Serial.println(“Motor: off”);
flag=1;
}
}
// if the state is ‘1’ the motor will turn right
else if (state == ‘1’) {
digitalWrite(motorPin1, LOW); // set pin 2 on L293D low
digitalWrite(motorPin2, HIGH); // set pin 7 on L293D high
if(flag == 0){
Serial.println(“Motor: right”);
flag=1;
}
}
// if the state is ‘2’ the motor will turn left
else if (state == ‘2’) {
digitalWrite(motorPin1, HIGH); // set pin 2 on L293D high
digitalWrite(motorPin2, LOW); // set pin 7 on L293D low
if(flag == 0){
Serial.println(“Motor: left”);
flag=1;
}
}
}

For the android communication with our bluetooth module I’ve used the BlueTerm app, It’s completely free, so you just need to go to “Play store” and download it. Then you just need to connect your smarthphone with the bluetooth module. Remember to remove the TX and RX cables. (you can see in youtube video below how that’s done).

Step 4: Final Product

I’ve only set 3 commands to control the DC motor:

’0′ – Turns off the DC motor
’1′ – DC motor rotates to right
’2′ – DC motor rotates to left

Check this video to see the circuit in action!
you can visit my website for more electronic projects, interesting news and tips:
http://randomnerdtutorials.wordpress.com/

Major Components in Project

1x Arduino Uno
1x Bluetooth Module (for example: HC-05)
1x Smartphone (any Android will work)
BlueTerm application
1x L293D IC
1x DC motor
1x Breadboard
Jumper Cables

For more detail: Arduino Control DC Motor via Bluetooth




This Post / Project can also be found using search terms:

  • arduino bases bluetooth using motor
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  • arduino – control 2 dc motors via bluetooth
  • use ofdc moter in bloutooth controlled car
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