- 1 x Arduino with USB Cord
- 1 x RGB LED
- 1 x Bluetooth Module HC-05
- 13 x Jumper Wires 10
The Android must be paired with the Arduino before using the app. This can be done in the settings.
-
Android will send a message to the Arduino that looks like this 30-0-50|. Each number represent a color. 30 = red, 0 = green, and 50 = 0 blue. The "|" is used to tell the Arduino to stop reading data.
-
Once this message is received by the Bluetooth device, it is passed to the Arduino.
-
The Arduino will parse the message and use it to control the rgb leds.
When controlling rgb leds you must either use an analog pin or pins with the ~ next to them. These pins can do pulse with modulation (PWM).
#include <SoftwareSerial.h>
SoftwareSerial blueToothSerial(6, 7);
String getParseValue(String data, char separator, int index) {
int found = 0; int strIndex[] = {0, -1};
int maxIndex = data.length()-1;
for(int i=0; i<=maxIndex && found<=index; i++){
if(data.charAt(i)==separator || i==maxIndex){
found++;
strIndex[0] = strIndex[1]+1;
strIndex[1] = (i == maxIndex) ? i+1 : i;
}
}
return found > index ? data.substring(strIndex[0], strIndex[1]) : "";
}
void setup()
{
blueToothSerial.begin(9600);
blueToothSerial.write("AT+NAMErgb_led");
blueToothSerial.write("AT+PIN4444");
blueToothSerial.write("AT+BAUD4");
delay(1000);
}
void loop()
{
if (blueToothSerial.available()) {
String bt_string = blueToothSerial.readStringUntil('|');
int red = getParseValue(bt_string, '-', 0).toInt();
int green = getParseValue(bt_string, '-', 1).toInt();
int blue = getParseValue(bt_string, '-', 2).toInt();
analogWrite(11, red);
analogWrite(10, green);
analogWrite(9, blue);
}
}
