Here you have some projects I have done mixing arduino and app inventor, in order to be able to control the arduino using the phone:

Turning on/off a led

The aim of this first project was to know the basic things of how did arduino and app inventor work together, using an HC-05.

Here's the list of components I used:

• Arduino Uno
• One LED
• Wires
• One resistor
• HC-05
• A phone
• The arduino app "ledarduinobluetooth":

And here is the scheme of the circuit, made with fritzing:

Below you have the code I used on the Arduino:

 
  #include< SoftwareSerial.>
  SoftwareSerial BT(10,11);
  void setup() {
  // put your setup code here, to run once:
  BT.begin(9600);
  Serial.begin(9600);
  pinMode(12,OUTPUT);
  }
  char dato;
  
  
  void loop() {
  // put your main code here, to run repeatedly:
  if(BT.available())
  {
  dato=(BT.read());
  Serial.println(dato);
  if (dato=='A'){
    digitalWrite(12,HIGH);
    }
    if (dato=='B'){
    digitalWrite(12,LOW);
  }
  }
  }
  

And here you have the blocks and design of the app inventor:

Scan to get the app:

This code is quite simple. By using it, you are ordering the arduino to turn on the LED if it recieves an A and to turn of the LED if it recieves a B. The letters are send by the app, as it is on the code:

Controlling a RGB

The aim of this first project was to know the a bit more of how did arduino and app inventor work together, using an HC-05, and also making something a bit more complex to transfer it into some future projects

Here's the list of components I used:

• Arduino Uno
• One RGB
• Wires
• Three resistors
• HC-05
• A phone
• The arduino app "Control_RGB":

And here is the scheme of the circuit, made with fritzing:

Below you have the code I used on the Arduino:

 
  #include

int btTx = 10;
int btRx = 11;

SoftwareSerial bluetooth(btTx, btRx);

void setup()
{
pinMode(5,OUTPUT);
pinMode(6,OUTPUT);
pinMode(9,OUTPUT);

digitalWrite(5,LOW);
digitalWrite(6,LOW);
digitalWrite(9,LOW);

Serial.begin(9600);

 bluetooth.begin(9600);
}
void loop()
{
  if(bluetooth.available()>=2 )
  {
    int color1 = bluetooth.read();
    Serial.println(color1);
    int color2 = bluetooth.read();
    Serial.println(color2);
    int color = (color2 *256) + color1;
    Serial.println(color);
    
     if (color >=1000 && color <1255){
     int red= color;
     red = map(red,1000,1255,0,255);
     red = constrain(red,0,255);
     //red=255-red;
     analogWrite(9,red);
     Serial.println("red:");
     Serial.println(red);
     delay(2);
     }
     
      if (color >=2000 && color <2255){
     int green= color;
     green = map(green,2000,2255,0,255);
     green = constrain(green,0,255);
     //green=255-green;
     analogWrite(6,green);
     Serial.println("green:");
     Serial.println(green);
     delay(2);
      }
      
      if (color >=3000 && color <3255){
     int blue= color;
     blue = map(blue,3000,3255,0,255);
     blue = constrain(blue,0,255);
     //blue=255-blue;
     analogWrite(5,blue);
     Serial.println("blue:");
     Serial.println(blue);
     delay(2);
      }

     }

}
  

And here you have the blocks and design of the app inventor:

Scan to get the app:

The app sends numbers between 1000-1225/2000-2225/3000-3225, dependig if the color selected is green, red or blue. This information is recieved by the arduino, which turns on or off on color or another