Introduction
This tutorial is an open source arduino project that teaches how to control 8 LEDs wireless on your smartphone using bluetooth module, the possible purpose of this lesson is you can make an LED chaser using 8 leds that you can control using this components.
What Will I Learn?
HARDWARE
- Step 1: Gather all the Requirements
Requirements
- Bluetooth Module HC-05/06/07
- 8 Pcs LED
- 8 x 220k ohms Resistors
- Breadboard
- jumper wires
- Type B usb cable
- Arduino UNO R3 board
- PC
Difficulty
- Basic arduino Project
Tutorial Contents
- Information about the 4 main components
Bluetooth Module HC-05
For this tutorial I will going to control led using HC-05 bluetooth module, this module is a component that uses for controlling an Arduino using a smartphone, The HC-05 module is a Bluetooth Serial Port Protocol module, which means it communicates with the Arduino via the Serial Communication.
LED
The light emitting diode or the LED this component emits visible light when current passes thru it, it is a lowe powered components, high efficiency and long life as long as it doesnt short circuit. the led has 2 set of legs, the common ground and the VCC which we will discuss on the experimental stage.
Resistor
Resistor have a specific measured in ohms, in this tutorial i use the 220k ohms for the LED They are passive components, meaning they only consume power it controls the amount of current that flows into the components to protect them from over volume of current that flows through the LED
The arduino UNO R3
has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header and a reset button. 32k Flash Memory,source
codes and programs can be uploaded on to it from the easy Arduino computer program. which makes it a very easy way to get started working with embedded electronics. The name R3 is the third, and latest version of Arduino Uno Board
Experimental Procedures
- Step 2: Build the circuit
The HC-05 has 6 set of pins, we will use only the 4 pinswhich are the (1) VCC it refers to the power signal of the LCD typically connected to 5volts, (2)GND or sometimes zero voltage, It is also the common connection of the module must connect to in one way or another path in order to complete the circuit. (3) RX (Receive Pin, which supports only 3.3V) needs to be connected through a voltage divider then to pin TX on the arduino. On the other hand, the line between the Bluetooth module (4) TX pin to the RX Arduino pin.
- RXD pin to - TX of the arduino pin
- TXD - RX pin
- GND- GND
- VCC - 5V
The LED has 2 sets of leg the short one is the common cathode and the long leg will be the VCC, on this procedure place the leds on the breadboard vertical rail or on the middle rail, on the short leg connect the 22ok ohms resistor to the horizontal rail of the breadboard then to GND on the arduino. the long leg should be conncted tospecified arduino digital pin.
Connect both Bluetooth module and the 8 LEDs in one breadboard circuit.
SOFTWARE
- Step 3: Dowload the Software and application.
If you’re ready to get started, click on the link below then select the version with your operating system.
Dowload the arduino Desktop IDE: https://www.arduino.cc/en/Main/Software
When the download is finished, un-zip it and open up the Arduino folder to confirm that click yes, there are some files and sub-folders inside. The file structure is important so don’t be moving any files around unless you really know what you’re doing.
Download the androin application Arduino Bluetooth Control LED link here; https://play.google.com/store/apps/details?id=arduino.bluetooth.leds
by Digital2u.net the app can control 8 led using arduino and bluetooth module.
- Step 5: Programming
We are using the sketch code from github: https://github.com/amphancm/ArduinoBluetoothLED/blob/master/BluetoothControlLED.ino
Source code
#define LED_PIN1 2 //
#define LED_PIN2 3
#define LED_PIN3 4
#define LED_PIN4 5
#define LED_PIN5 6
#define LED_PIN6 7
#define LED_PIN7 8
#define LED_PIN8 9
int inByte1 = 0; // incoming serial byte
int inByte2 = 0;
byte bit0 = B00000001; // 1
byte bit1 = B00000010; // 2
byte bit2 = B00000100; // 4
byte bit3 = B00001000; // 8
byte bit4 = B00010000; // 16
byte bit5 = B00100000; // 32
byte bit6 = B01000000; // 64
byte bit7 = B10000000; // 128
byte bitDelay = 100;
boolean status_unlock;
boolean status_bluetooth;
long interval = 100; // interval at which to blink (milliseconds)
long previousMillis = 0; // will store last time LED was updat
int minite,sec;
void setup()
{
// start serial port at 9600 bps:
Serial.begin(9600);
pinMode(LED_PIN1, OUTPUT);
pinMode(LED_PIN2, OUTPUT);
pinMode(LED_PIN3, OUTPUT);
pinMode(LED_PIN4, OUTPUT);
pinMode(LED_PIN5, OUTPUT);
pinMode(LED_PIN6, OUTPUT);
pinMode(LED_PIN7, OUTPUT);
pinMode(LED_PIN8, OUTPUT);
digitalWrite(LED_PIN1, LOW); // switch on LED
digitalWrite(LED_PIN2, LOW); // switch on LED
digitalWrite(LED_PIN3, LOW); // switch on LED
digitalWrite(LED_PIN4, LOW); // switch on LED
digitalWrite(LED_PIN5, LOW); // switch on LED
digitalWrite(LED_PIN6, LOW); // switch on LED
digitalWrite(LED_PIN7, LOW); // switch on LED
digitalWrite(LED_PIN8, LOW); // switch on LED
Serial.print("Arduino control LEDs Start");
Serial.print('\n');
}
void loop()
{
while (Serial.available() > 0) {
inByte1 = Serial.parseInt(); // get incoming byte:
char c = Serial.read();
if ( (c == '\n') || (c == '\r')) {
Serial.println(" ");
if (inByte1 & bit0){ // if bitwise AND resolves to true
digitalWrite(LED_PIN1,HIGH); // send 1
}
else{ // if bitwise and resolves to false
digitalWrite(LED_PIN1,LOW); // send 0
}
if (inByte1 & bit1){ // if bitwise AND resolves to true
digitalWrite(LED_PIN2,HIGH); // send 1
}
else{ // if bitwise and resolves to false
digitalWrite(LED_PIN2,LOW); // send 0
}
if (inByte1 & bit2){ // if bitwise AND resolves to true
digitalWrite(LED_PIN3,HIGH); // send 1
}
else{ // if bitwise and resolves to false
digitalWrite(LED_PIN3,LOW); // send 0
}
if (inByte1 & bit3){ // if bitwise AND resolves to true
digitalWrite(LED_PIN4,HIGH); // send 1
}
else{ // if bitwise and resolves to false
digitalWrite(LED_PIN4,LOW); // send 0
}
if (inByte1 & bit4){ // if bitwise AND resolves to true
digitalWrite(LED_PIN5,HIGH); // send 1
}
else{ // if bitwise and resolves to false
digitalWrite(LED_PIN5,LOW); // send 0
}
if (inByte1 & bit5){ // if bitwise AND resolves to true
digitalWrite(LED_PIN6,HIGH); // send 1
}
else{ // if bitwise and resolves to false
digitalWrite(LED_PIN6,LOW); // send 0
}
if (inByte1 & bit6){ // if bitwise AND resolves to true
digitalWrite(LED_PIN7,HIGH); // send 1
}
else{ // if bitwise and resolves to false
digitalWrite(LED_PIN7,LOW); // send 0
}
if (inByte1 & bit7){ // if bitwise AND resolves to true
digitalWrite(LED_PIN8,HIGH); // send 1
}
else{ // if bitwise and resolves to false
digitalWrite(LED_PIN8,LOW); // send 0
}
Serial.print(inByte1);
Serial.print(" OK");
}
//delay(inByte2 * bitDelay); //delay
//Serial.println("OK");
} // if(Serial
} //Loop- Step 6: Connecting the Smartphone to the HC-05 Bluetooth Module
Open your bluetooth settings on your cellphone, search for available devices < look for > HC-05 device name then PAIR input password 1234 then connect.
- Open the app then choose the bluetooth device HC-05 to connect it. you can make an LED chaser by tapping the start LOOP in many times.
I hope this Tutorial might help you on your future activity. thank you.
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