Showing posts with label arduino. Show all posts
Showing posts with label arduino. Show all posts

Interfacing SPI TFT with Arduino.

By // 4 comments:
Hey fellas!
It's been long since our last blog...but worry not! Here I'm back again with something new to try this time around. This blog will let you know how to interface a 1.8 inches SPI TFT with arduino. The task may get a bit tricky if someone just starts without taking a few things in consideration. So here we go!

Now what's with this "SPI" term? Why not just a TFT?
Well, that's because like you all must have known, there are 2 modes of transferring data, SERIAL & PARALLEL. When there are separate multiple data buses for data transfer, that's a Parallel Data Bus TFT or more generally known as a normal TFT. These types of displays will have a comparatively large no. of pins to connect (quite obvious), as 8 or 16 pins are for data bus alone and then the other ones too.
They generally take up all the space on an UNO or even may require a shield as well.

When there is a single data bus to transfer all the data, all the data is streamlined in a series and then pushed towards the receiving end. This type of TFT is called an SPI TFT, where SPI stands for SERIAL PERIPHERAL INTERFACE. Now we know what that un-abbreviated form says!

Also remember that this 1.8 inches SPI TFT has different pin connections on an UNO (or similar) board and the MEGA board. On MEGA, the SPI pins lie at 50,51,52 and 53. 

First of all, list of required items is as follows:
* Arduino UNO (or similar) x 1
* 1k ohm resistances x 5
* One-2-One connectors x 8

The TFT library comes pre-installed in Arduino version 1.0.5 and later.

Make the connections as mentioned below-

Dc (A0)
11 (UNO) or 51 (MEGA)
13 (UNO) or 52 (MEGA)

Now instead of making the first 5 connections directly to Arduino, put a resistor of 1k or similar value between the TFT pin and the Arduino pin. That’s because the IO ports are 3.3v tolerant while the Vcc required is 5v. It is quite possible because of it’s non-standard chinese manufacturing.

Now, open the IDE and run the any sketch except the “BitmapLogo”. This sketch uses the SD card function and requires you to hook up the TFT with an SD card as well, which is definitely not a part of this article.

I’m putting a demo sketch that I ran successfully-

#include <TFT.h>  // Arduino LCD library
#include <SPI.h>

// pin definition for the Uno
#define cs   10
#define dc   9
#define rst  8

// pin definition for the Leonardo
// #define cs   7
// #define dc   0
// #define rst  1

// create an instance of the library
TFT TFTscreen = TFT(cs, dc, rst);

// char array to print to the screen
char sensorPrintout[4];

void setup() {

  // Put this line at the beginning of every sketch that uses the GLCD:

  // clear the screen with a black background
  TFTscreen.background(0, 0, 0);

  // write the static text to the screen
  // set the font color to white
  TFTscreen.stroke(255, 255, 255);
  // set the font size
  // write the text to the top left corner of the screen
  TFTscreen.stroke(255, 0, 0);
  TFTscreen.text("IoT Freaks!\n ", 20, 0);
  TFTscreen.stroke(0, 255, 255);
  TFTscreen.text("Sensor value\n ", 12, 25);
  // ste the font size very large for the loop

void loop() {

  // Read the value of the sensor on A0
  String sensorVal = String(analogRead(A0));

  // convert the reading to a char array
  sensorVal.toCharArray(sensorPrintout, 4);

  TFTscreen.stroke(255, 255, 0);
  TFTscreen.text(sensorPrintout, 34, 50);
  TFTscreen.stroke(0, 0, 0);
  TFTscreen.text(sensorPrintout, 34, 50);

This sketch requires a sensor at pin A0 to read it's value and then display it as text on  the TFT. So put any analog value sensor such as a potentiometer, an LDR, an IR pair or whatever you have.

Viola! I’m pretty much sure you’ll have it done then……

Be sure to buy the stuff mentioned in this blog by clicking on the link below-

The vendor's offering interesting and working hardware at quite handy rates. Go give it a try! :)

So until my next blog, this is it. As always, any problem you face and wish to discuss it, the comment boxes are always down there and you can reach me as well at

For more of these interesting stuff, like my page-

And our community,

How To Interface PIR Sensor With Arduino

By // 9 comments:
Hello Arduinians... Ever thought of detecting motion via your Arduino.... if yes, then this one's for you. In this tutorial, We're interfacing PIR sensor today with Arduino. Let's gets started!

Block Diagram
Working of PIR Motion Sensor
Block Diagram
Components Required For This Tutorials
  1. 1 * Arduino Board
  2. 1 * PIR Motion Sensor(you can buy from here)  
  3. Breadboard
  4. Jumper wires
  5. Battery

What is PIR motion sensor & how it works?

Basically, a PIR stands for "Passive Infrared Sensor". The sensor works on the principle of infrared waves' detection those are being emitted by human bodies. They are undetectable to us but can be discovered by the devices designed for such special purposes. I'm going to go just a little deep, enough to make you understand the internal operation.
When a body moves in front of a PIR sensor, the temperature of that place changes where the body has moved. If the body makes a further movement, the composition of infrared waves being received by the PIR from that region changes and since the reading is not the same as last reading, it generates a signal for the microcontroller and we work on it accordingly.

Circuit Diagram
We can easily interface PIR motion sensor with Arduino-like our other sensor. But it all depends on our logic of the code, how efficiently do we want to detect motion through it.
A PIR has 3 pins, just like any other sensor, Vcc, Signal & Ground pin. A very simple circuit of interfacing PIR motion sensor with Arduino is shown below
circuit diagram of PIR Motion Sensor
PIR Motion Sensor description
                                                                                          PIR Motion Sensor                                          
The 2 knobs are there too. One for adjusting sensitivity by increasing or decreasing the range of motion detection and another one for response delay. If you're using PIR in your home security, I strongly suggest you set the range at maximum (towards right). However, the detection range offered by a PIR sensor is good enough, like about 6 metres as I've tested it successfully.

Source Code
Here is a very simple code for this tutorial which only detects if there is ANY motion and triggers an LED for confirmation.Write below code into Arduino IDE and compile it.

int pirSensor=5;                                                     // connect sensor at pin 5
int led=13;                                                             // connect led at pin 13
void setup() 
   Serial.begin(9600);                                             // initialize serial
   pinMode(led, OUTPUT);                                  //  initialize led as output
   pinMode(pirSensor, INPUT);                            //  initialize sensor as input  

void loop() 
  int sensorValue = digitalRead(sensor);                // read sensor value
  Serial.println(sensorValue);                                 // print sensor value  
  delay(100);                                                          //  delay 100 miliseconds
  if(sensorValue > 600)
  { digitalWrite(led,HIGH); }

Now you can connect the signal pin to any analog pin also but for that, you'll have to check what values do you get on the serial monitor and which value do you wish to use as a threshold for triggering any LED, buzzer, etc.
Note that the sensor first takes some time for its calibration and after that it starts detecting motion. If any motion is detected, it triggers the LED on Arduino board and keeps searching for the motion for a certain amount of time. It only settles low if there is no further motion detected for that given search period (which can be changed in code). Giving a search window to your sensor, makes it's working more efficient and there are better chances for you to get non-erroneous functioning.
I too did both codes and both worked fine for me. Here's a snap!
PIR motion sensor circuit
So that's an end to our tutorial  for this time. Hope you enjoyed reading. If you liked this tutorial then don't forget it to share with your friends. I'll be back with more..... till then #happyDIYing

If you have any question or query or feedback regarding this tutorial then leave a comment below and we will solve those as soon as possible.

Be sure to buy the stuff mentioned in this blog by clicking on the link below-

The vendor's offering interesting and working hardware at quite handy rates. Go give it a try! :)

Learn How To Make A Digital Voltmeter Using Arduino

By // 8 comments:
Arduino is very popular and easy to use. With Arduino, we can do lot's of projects and experiment. So today we add one more projects in our Arduino project list. In this article, we are going to make a digital voltmeter.using an Arduino board. In this project, we measure the input voltage range between 0 to 50V by using the voltage divider. It is very simple to use Arduino as a voltmeter. Arduino UNO has  5 analog pin to read the input analog value. If we have an idea about reference voltage then we can easily measure the input voltage. Here we will use 5V as a reference voltage.
Block Diagram
arduino based dc voltmeter circuit diagram
Block Diagram of DC Voltmeter
Component Required 
  1. 1 * Arduino Board(In this article we use Arduino UNO)
  2. 1 * LCD Module(Here we will use 16 * 2 LCD Module)
  3. 1 * 100K Resistor 
  4. 1* 10K Resistor
  5. 1 * 5K Potentiometer
  6. Some jumper wires
  7. Breadboard 
Circuit Diagram
Circuit diagram of this projects is very simple and easy to understand. Here we use a 16 * 2 LCD module to display the voltage. Read this article to learn How To Interface LCD With Arduino UNO.
arduino based DC Voltmeter circuit
Circuit Diagram
A voltage divider circuit is used here to divide the input voltage by the range  of Arduino board. As we all know that Arduino is compatible with till 5v only. Above this voltage, our Arduino may be damaged.
Analog input pin on the Arduino board measure the input voltage and convert it into digital format by using inbuilt ADC(analog to digital converter) that can be processed  by Arduino and then display it on LCD. In this project, we fed input voltage to analog pin A0 of Arduino by using the voltage divider circuit. A simple voltage divider circuit is made by using one 100kohm and one 10kohm resistor to make the 1:11 divider. Thus, by using this voltage divider circuit we can measure the voltage up to 55V.                      
         Voltage divider output  Vout  = Vin * ( R2/(R1+R2) )
It is good if you use this voltmeter project to measure the voltage within range 0v to 35v. Because large voltage may be damaged your Arduino board. 

In this project, we use inbuilt liquid crystal library for the display of voltage value and analogRead() function to read the input voltage at the analog pin A0. Here our reference voltage is 5V, hence we multiply read value with 5 and then divide it with 1024 to obtain the actual voltage. Then by using the voltage divider formula we can decrease this value within the range of Arduino board voltage.

Video Demonstration 

A Guide For Interfacing Analog Sensors With Arduino

By // 3 comments:
With Arduino, almost everything seems to be too friendly when it comes to interfacing various sensors, shields, add-ons or any other utility devices. Just because the Arduino coding environment is so user-friendly, anyone can do it. So in this post, I will just show you how to hook up your sensors to Arduino and get them running. Let's start with the very basics....

sensor interfacing with arduino
What is Sensor
Sensors are those electronic components which convert physical data into electronic data. This data is in analog format and is fed to the microcontroller on the Arduino board. The microcontroller has inbuilt ADCs (Analog-2-Digital Converter) which processes this data and converts it into digital format.

And once you have received the (electronically converted) physical data, you can make your Arduino perform as you want.

On your Arduino board, there are analog pins named as A0, A1, A2, A3, A4, A5. The number of these pins may vary depending on your Arduino board. For UNO, there are only 6 analog pins while for MEGA there are 16. And remember this thing, any sensor (or other components) that gives analog data and you wish to process it, you'll have to connect it to your analog pins only. For now, I would say SENSORS would always be connected to analog pins.

Connection of Analog Sensor with Arduino
All sensors have their own method to connect with Arduino. Some of them need pull-up resistors, some need a certain power supply to use them.  But any sensor has generally 3 pins to connect to Arduino or other development board. These pins are. 
1. +Vcc
2. Signal
3. Gnd
Hook up the +Vcc to 5v (or 3.3v if sensor demands it) on your Arduino board.
Connect the Gnd pin to Ground pin on your Arduino.
Connect the Signal pin to any of your Arduino's analog pins. In our case, say A1.

Code for Interfacing Analog Sensor with Arduino
Below code is general code for interfacing analog sensors with Arduino. Write this code in your Arduino IDE to start playing with analog sensors.
void setup()
  Serial.begin(9600);                            // initialize serial communication at 9600 bits per second:

void loop() 
  int sensorValue = analogRead(A1);            // read the input on analog pin 1:
  Serial.println(sensorValue);                       // print out the value you read:
  delay(1);                                                      //this  delay in between reads for stability 

After burning this code to your Arduino, open the serial monitor and see the analog-2-digital converted data on your serial terminal. Basically, it is 10-bit data since the inbuilt ADC of your Arduino is a 10bit ADC.You will get the reading on your serial monitor.

That's all for now. Hope you got everything out of that blog.I'll try to bring something new next time. Till then........ keep learning and keep prototyping.

If You have got any problem or feedback then comment below. I will be right back to you soon.

Be sure to buy the stuff mentioned in this blog by clicking on the link below-

The vendor's offering interesting and working hardware at quite handy rates. Go give it a try! :)

Arduino Distance Measurement Using Ultrasonic Sensor

By // 5 comments:
We all know about the ultrasonic sensor and also wanted to play with it, but don't know how ultrasonic sensor works. So In this article, we will see  how to use an ultrasonic sensor with your projects. The ultrasonic sensor is very popular among arduino hobbyist and there are so many projects which you will be able to do at the end of this article.

Description of HC-SR04 Ultrasonic Sensor
ultrasonic sensor
Ultrasonic Sensor can measure the distance from 1" to 13 feet( 1 cm to up to 4metre) with accuracy up to 3mm. A hc-sr04 ultrasonic sensor has 4 pin GND, VCC, Echo and Trigger Pin. Trig pin generate an ultrasound by setting trig pin on the high state of 10 microseconds. Echo pin produce an output in a microsecond when ultrasound returns back from the object to echo pin.

We can calculate the distance by using simple formula Speed=(Distance/Time). The speed of the sound is 340m/s and thus by calculating ultrasound travel time we can calculate the object distance from the ultrasonic sensor.

Required Components
  1. 1 Arduino UNO board( Buy from here Arduino )
  2. 1 HC-SR04 ultrasonic sensor ( Buy from here sensor )
  3. Jumper wire
  4. Breadboard

Circuit Diagram
Ultrasonic sensor pin connected to arduino pin in a very simple manner as shown in the image below. Here we use a voltmeter as a reference because we can't place a real object before the LDR. So when we increase or decrease the voltage level of voltmeter then its corresponding value also changed.
Arduino           Ultrasonic sensor
Vcc                      Vcc
Pin 5                   Trig
Pin 4                   Echo
Gnd                     GND 
ultrasonic_sensor circuit
Source code
Here first we define the trig pin and echo pin of the ultrasonic sensor and they are pin no 5 and pin no 4 respectively. Here we define Trig pin as output and Echo pin as an input. After that, we defined three long variable name duration, cm and inches. In the loop first we set the Trig pin Low for few microsecond and after that, we set it in the high state for 10 microseconds. We read the travel time by ultrasound by using the pulseIn() function.
ultrasonic sensor source code
Source Code
For getting the exact distance we multiply .034 in duration and then divide it by 2 because ultrasound travels forward and backward. At the end we use Serial.print() function to print the value in the virtual terminal.You can download the source code by clicking on the link.

Video Demonstration 

Hope you like this tutorial on the ultrasonic sensor. If you have got any problem using the ultrasonic sensor or its proteus simulation then feel free to comment below or if you have any suggestion about this tutorials and let me know by your valuable comments. 

How to Interface 4*3 Keypad With Arduino

By // No comments:
In this article, we will find out how to interface a matrix keypad with arduino in very easy technique. During this article, we are using a 4*3 matrix keypad. Keypads are a very important component in the embedded system which are used in various mini or major comes and the commercial product like telephone, electronic locker, and alternative automation product. At the end of the article you may be ready to interface a matrix keypad together with your arduino and after you press a key, its shows up into the serial monitor.

What is 4*3 Matrix Keypad
One of the most frequently asked question among the students or hobbyist are when we use 4*3 or 4*4 matrix keypad and what is the difference between them. Therefore, we have only one answer what's your requirement within the project. The logic behind operating of each keypad are same. The 4*3 keypad is simple keypad having 4 rows and 3 column, therefore, total 12 keys as shown in the image. There are so many distributors wherever you will purchase a keypad otherwise you can purchase from here
type of keypad matrix 4*3 Keypad matrix 

Circuit Diagram
The circuit of interfacing of a keypad with arduino is very simple. You only need to connect rows 1, 2, 3, 4 to digital pin 6, 7, 8, 9 respectively and column 1, 2, 3 are connected to digital pin 10, 11, 12 respectively of the arduino. The circuit is extremely easy to grasp as shown in the below image.
simple circuit diagram of keypad interfacing with arduino
Circuit Diagram

Program of interfacing a keypad with arduino is extremely easy. Here we simply use an if-else statement to check every condition one by one. First we kept row 1 low and check all condition for it and equally with others rows one by one. You can download the source code from here.
From here you will display the key on an LCD and build a lot of other cool projects like door lock, calculator, security system enabled projects. Hope you like this article. If you have got any doubt then comment below or have any suggestion then you may be forever welcome to ProjectsDunia.


How To Interface Relay With Arduino

By // 1 comment:
A Relay is an electromagnetically operated switch. Relays are used to control a circuit. Many relays consist a coil, a yoke, and an armature. When a current is passed through the coil, a magnetic field is induced in the coil which moves the armature and relay start its switching function. A normal relay has NO(normally open), NC(normally connected), COM and coil pin within it. A Simple one channel relay is shown in below image
relay driver interfacing
Required Components
For designing a relay driver circuit you will need following components 
  • Relay
  • 1N4007 Diode
  • BC547 Silicon NPN transistor
  • 10K Resistor 
Circuit Diagram
A simple relay driver circuit is shown in below image. Here we use an NPN BC547 transistor to drive the relay.Base current ought to be a lot of enough to turn on a transistor. A diode 1N4007 use among the circuit to protect the transistor from damage due to back emf. When relay is in off state, COM pin of 

circuit diagram of relay driver
Relay Driver Circuit 
a relay is connected to NC(normally connected) pin and when a small current start flows through relay coil then COM pin is connected to NO(normally open) pin.

NOTE: Change +5V  to +12V in the circuit 

Code for relay testing is same as for blink an LED so learn  how to blink an LED and test your relay driver circuit. Now using relay make some more cool projects using arduino like control your AC home appliances, turn ON/OFF a bulb and many more.

Hope you like this article and give your valuable feedback by commenting below or if you have got any problem then also comment below. 

How To Interface LDR With Arduino

By // No comments:
Hello, Friends hope all of you playing with your arduino and currently need to try to do another cool projects on arduino. Therefore, this tutorial is for you. During this tutorial, we interface LDR(Light dependent Resister) with the arduino board. It is very simple tutorials for arduino students, hobbyist, and beginners. Before going more we must find out how LDR is dependent on Light.

What is LDR 
interfacing ldr with arduino
LDR(Light dependent Resister) or a photoresistor is a light dependent variable resistor that resistance decreases with the increase in the intensity of light. This gives an analog value so that it is connected to an analog pin of arduino board. A simple LDR is shown within the image and to buy an LDR click on the below image

Circuit Diagram
A simple circuit diagram is shown in the image. We won't use LDR directly within the circuit in order that a potential divider circuit is used with a 10K resistor. In this circuit one pin of LDR is connected to Analog pin A0 of arduino UNO and one pin is connected to ground(GND).

circuit diagram of LDR interfacing with arduino
LDR Circuit
Source code
Now connect your arduino board together with your PC and upload the given source code into the board. After uploading the code run your program and see the different value in your serial monitor.

LDR interfacing source code with arduino
LDR Code

Watch This Video:

How To Display Custom Characters On LCD Using Arduino

By // No comments:
We all are aware of custom characters used in the various display module.Heart, various style of smileys, arrow are the foremost usually used custom characters. Thus, during this tutorial, we are going to learn how to display custom characters in LCD using arduino UNO board. This project is done by using of arduino UNO board and 16*2 LCD module.

how to display custom character in lcd using arduino
Custom Character Display
It is assumed that reader knows how to interface LCD with arduino and how to install arduino software.We can generate a completely different style of the custom character using the below pixel array shown in the image. 
use of pixel array of lcd
Pixel array
the custom character shown below that is used in our program to generate the smile type character:

Circuit diagram:
circuit diagram of display custom character in lcd
Circuit Diagram
Source Code:



Interfacing Push Button Switch to Arduino

By // No comments:
There are many electronic circuits can be used to interface with the device in the real world using switches as inputs. The simplest type of interfacing device is push button switches due to its low price and simple interfacing with any kind of electronic circuit. Push button switches are widely used in many electronic projects so knowledge of their interfacing is extremely essential in designing projects. So during this article, we learn how to interface push button switches with arduino. I hope you have knowledge about Arduino Board and led interfacing. Push button has four terminal and its allow current to pass through it when you press it down. 
push button interfacing
Push Button
Here we use PULL-UP or PULL DOWN resistor while using switches. PULL-UP register is a register connected between power supply and connector to give an electricity on certain condition.To understand the working of Pull-UP resistor look the image how its work.
working of pullup resistor
Pull-Up Resister
REED THIS ARTICLE  Interfacing LCD With Arduino UNO

Circuit Diagram
circuit of push button interfacing
Circuit Diagram
Source Code
code of push button interfacing
Source Code

Download source code and circuit diagram file from here



Arduino-based Automatic Temperature Fan Speed Controller

By // 21 comments:
In many small or large industry, you may have seen such a lot of fan that speed is control according to the temperature of the place. Thus, during this article, we have presented a demo of that application. It's assumed that you have an idea of how to read reading from the temperature sensor IC. In industry
temperature range will be more than 100 oC  but here we will work on the very low range.
Block diagram of Temperature control FAN

block diagram of temperature control fan using arduino board
Block Diagram
Required Components 
  1. Arduino UNO board (buy from here arduino )
  2. Temperature sensor IC LM35( buy from here LM35 sensor )
  3. DC Fan
  4. resistor 1* 1K
  5. 16*2 LCD Display
  6. Power supply  
  7. Diode(1N4007) 
Circuit Diagram 
In this application, we use an arduino board to control the speed of the fan and a 16*2 LCD display to display the status of the fan. Here we use a diode in parallel with FAN to prevent it from the damage and a 9V battery to provide power to the fan.

circuit diagram of arduino based temperature control fan
Circuit Diagram
Again like our previous projects, code for this projects is also very simple. Here we use an analogRead() function to get the value of temperature sensor and store that value in the variable.When this value will exceed the min_temp value then the fan will start otherwise its always off. Download the file to get the source code of this projects along with its circuit diagram.
source code of arduino based temperature control fan
Source Code
In the below link you will get all the file required for this projects.

Video Demonstration

How To Make a PC Control Robot

By // 7 comments:
Do you ever tried to control your robot using your PC or laptop? Controlling a robot using PC or laptop is often being a fun for the student or hobbyist. Thus during this article you will be tend to learn how to control your robot using your PC or laptop. Here it is assumed that you know How To Send Serial Data From Arduino To Laptop or PC and How To Receive and Send Serial Data Using Arduino Board. Thus lets begin to making this awesome DIY hack today with us.
controling a robot via PC using arduino board
Replica of robot

Component Required:

  1. Arduino UNO Board
  2. PC/Laptop
  3. L293D Motor Driver IC
  4. 2 Motor
  5. Serial Bluetooth Module
  6. 2 wheels
  7. Chassis
  8. Castor wheel
  9. Software (serial port software on your PC/laptop) 
Click here to see more projects on Arduino

Block Diagram:
Block diagram PC control robot using arduino
Block Diagram
Setup Connection For Robot:
circuit diagram of Pc control robot
Circuit Diagram
Here we use a L293D motor driver IC which is used for the controlling the rotation of the two motor connected to robot. Pin no 2,7,10,15 of L293D motor driver IC is connected to the pin no 9,8,7,6 of arduino board. Output pin 3,6,11,14  of the L293D motor driver IC is connected with the motor as shown within the Circuit Diagram Image.
L293D motor driver IC
L293D Motor Driver IC
For the connection of RX and TX read this article How To Receive and Send Serial Data Using Arduino Board 
NOTE:- Bluetooth Module should be removed while uploading the code from PC to Arduino board.

Code for PC Controlled Robot:

If you are beginner to arduino then download Arduino IDE from here How To Install Arduino Software On Windows. We use 9600 baud rate for the transmission of the data from PC/Laptop to Robot.Click here to Download the source code for PC controlled robot. 
code for the pc controlled robot
Arduino Code
We can control the robot using the following instruction 
'8' = Forward
'2' = Backward
'4' = Move Left
'6' = Move Right
'5' = Stop




If You have got any problem then be happy to comment in comment box or you can contact us at Facebook or Google+

Controlling LEDs With PC Using Arduino

By // No comments:
Wireless communication plays a very important role within the communication system. We may be able to send data from one point to another point simply through wireless communication. There is such a large option available for the wireless communication like Bluetooth, Wi-Fi etc. In this article, we concern only in Bluetooth. Bluetooth is a standard wireless technology which transfers the information over very short distances. It is assumed that you just ought to knowledge to How To Send Serial Data From Arduino To Laptop or PC and How To Receive and Send Serial Data Using Arduino Board

Controlling led via PC/Laptop

After Reading this article you will be able to control LED via your PC/Laptop. For controlling the led we use arduino board Introduction to Arduino Board

Circuit diagram:

Here we use three led blue, green and red that are connected to pin no. 10,9 and 8 of arduino board respectively. We also connect an LCD display module to arduino board. read this post for Interfacing LCD With Arduino UNO. All other connection for controlling led via PC is shown below image

circuit diagram for led control
Circuit Diagram

// ProjectsDunia
// Our Facebook Page

//  control LED with your PC

#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
int blue_led=10;
int green_led=9;
int red_led=8;
int store=0;
void setup()
    // set up the LCD's number of columns and rows: 
  lcd.begin(16, 2);
  // initialize the serial communications:
  pinMode(blue_led, OUTPUT);
  pinMode(green_led, OUTPUT);
  pinMode(red_led, OUTPUT);
void loop()
  // when characters arrive over the serial port...
  if (Serial.available()) 
    // save the data;
      case '1':
      lcd.write(" Blue_LED ON ");
      case '2':
      lcd.write(" Blue_LED OFF ");
      case  '3':
      lcd.write(" Green_LED ON ");
      case '4':
      lcd.write(" Green_LED OFF ");
      case '5':
      lcd.write(" Red_LED ON ");
      case '6':
      lcd.write(" Red_LED OFF ");

LED control file


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