Arduino Bluetooth Controlled Robot

                         Bluetooth Controlled Robot

1. Connections for HC-05 Bluetooth module:-

Arduino                                                                                     HC-05 Bluetooth Module

3.3V                                          Vcc

Gnd                                           Gnd

 Tx                                           Rx

 Rx                                           Tx

2. Connections for L293D module:-

Here in L293d motor driver at the top we have total 7 pins . 4 Pins are used for controlling the motor and 3 pins in the middle of the l293d module are used for powering the module.

Connect the arduino and L293d as follows:-

Arduino Pins:-                L293d Motor Driver

Pin 13                                   M1 a                           // for controlling motor 1

Pin 12                                   M1 b

Pin 11                                   M2 a                           // for controlling motor 2

Pin 10                                   M2 b

Vin                                        12v

Gnd                                       Gnd                                     // providing power to L293d module

5v                                          5v

2. Code for Bluetooth Controlled Robot :-

String voice; void setup() { Serial.begin(9600); pinMode(13, OUTPUT); pinMode(12, OUTPUT); pinMode(11, OUTPUT); pinMode(10, OUTPUT); } void loop() { while (Serial.available()) { delay(10); //Delay added to make thing stable char c = Serial.read(); //Conduct a serial read if (c == '#') { break; } //Exit the loop when the # is detected after the word voice += c; //Shorthand for voice = voice + c } if (voice.length() > 0) { Serial.println(voice); if(voice == "*forward") { digitalWrite(13,HIGH); digitalWrite(12,LOW); digitalWrite(11,HIGH); digitalWrite(10,LOW); //code for foward move } else if(voice == "*backward") { digitalWrite(13,LOW); digitalWrite(12,HIGH); digitalWrite(11,LOW); digitalWrite(10,HIGH); //code for backward move } else if(voice == "*left") { digitalWrite(13,HIGH); digitalWrite(12,HIGH); digitalWrite(11,HIGH); digitalWrite(10,LOW); //code for left move } else if(voice == "*right") { digitalWrite(13,HIGH); digitalWrite(12,LOW); digitalWrite(11,HIGH); digitalWrite(10,HIGH); //code for right move } else if(voice == "*stop") { digitalWrite(13,HIGH); digitalWrite(12,HIGH); digitalWrite(11,HIGH); digitalWrite(10,HIGH); //code for stopping robot } voice=""; //Reset the variable after initiating } }