Android Arduino app and code for controlling RGB LED Circuit Diagram : Arduino Program : #include <SoftwareSerial.h> SoftwareSerial BT(10, 11); //TX, RX respetively String color; void setup() { BT.begin(9600); Serial.begin(9600); pinMode(2, OUTPUT); // blue pinMode(3, OUTPUT); // green pinMode(4, OUTPUT); // red } //-----------------------------------------------------------------------// void loop() { while (BT.available()){ //Check if there is an available byte to read delay(10); //Delay added to make thing stable char c = BT.read(); //Conduct a serial read color += c; //build the string- "blue, red and green" } if (color.length() > 0) { Serial.println(color); if(color == "blue") { digitalWrite(2, HIGH); digitalWrite (3, LOW); digitalWrite(4,LOW);...