#Bt android controller for free#
#Bt android controller code#

void manualCmd()ДЇor example, if the 'w' command is received the specific function to move the car forward: moveForward () is executed. Returning to the main loop while the variable 'turnOn' is HIGH, the manualCmd () function executes a command depending on the received character. Note that every time that the red button with the symbol of 'POWER' is pressed on the Android device, the character 'p' will be sent by the app and variable 'turnOn' will change if value (from 1 to 0 and vice versa) : void receiveCmd ()ДЄnalogWrite(ledStatus, turnOn*128) // Robot ON - Led ONДelay(200) //Delay to call attention to mode change The variable 'turnOn' is used to turn on or off the car. It will be in charge of executing the command received by the previous function. Once the BT device is checked, the receiveCmd () function is executed. The responsible is the function checkBTcmd () : void checkBTcmd() The first thing to do is to check if there is any new BT command coming.

#Bt android controller code#

The code of the main block is very simple: void loop()Д¬heckBTcmd() // verify if a comand is received from BT remote control This feature is very important during the testing phase, it can be used in the same way as the 'Serial Monitor'.ДЄbove, the Block diagram of the project at MIT appInventor2. There is also a text window for messages received from the BT module.

The app has a simple interface, allowing you to send commands to the BT module in both, TEXT mode or directly via pre-programmed buttons (each time a button is pressed, a character is sent):

#Bt android controller for free#

The app can be downloaded for free from the Google store via the link: To control the car, we will use an App that I developed, using the MIT AppInventor 2: 'MJRoBot BT Remote Control'. Invert the battery and repeat the test taking notes of the colors of the wires: Using a battery, feed each one of the the DC motors and see which way it rotates. Above you can see the new block diagram for circuit implementation.ДЄt this point, it is important to test the motors individually. For the Arduino we will use a 9V battery (connected to its Vin), and the HC-06 module will be powered by the 5V Arduino's output. By the way, the front motor consumes a lot of energy at the time it receives a command to turn to one side, because its axis is locked and the current consumption is maximun (like a 'short circuit'). As DC motors consume enough power and generate noise due to their brushes, this will help isolating the power system.

The original car battery will be kept exclusively for the original DC Motors via the H-Bridge L293D. The remote control was previously achieved by a 27MHz RF receiver system that will now be replaced by the HC-06 module, which will communicate with the Android device. In place of the electronic's module, we will use an Arduino Uno, which will be responsible for logic processing, triggering motors, LEDs and Buzzer. Once I will not be using the upper housing for now, I will not worry with the original LEDs. Once you learned how the car works, it's time to remove the original electronics, leaving only the motors and battery cables (probably you will need to add some extension to the original cables).