Saturday, April 4, 2020
Monday, March 30, 2020
Arduino Controller using smart phone
Circuit Diagram:
Arduino Source Code
const int redLed=12;
const int greenLed=11;
int state = 0;
//String s;
void setup() {
pinMode(redLed, OUTPUT);
pinMode(greenLed, OUTPUT);
digitalWrite(redLed, LOW);
digitalWrite(greenLed, LOW);
Serial.begin(9600); // Default communication rate of the Bluetooth module
}
void loop() {
if(Serial.available() > 0){ // Checks whether data is comming from the serial port
state = Serial.read(); // Reads the data from the serial port
if (state==0)
digitalWrite(redLed, LOW);
else if (state==1)
digitalWrite(redLed, HIGH);
if (state==2)
digitalWrite(greenLed, LOW);
else if (state==3)
digitalWrite(greenLed, HIGH);
Serial.println(state); // Send back, to the phone, the String "LED: ON"
}
}
Download Smartphone App
Wednesday, March 25, 2020
Octal encoder using Arduino and 7 segment display
Octal Encoder using Arduino and 7 segment display
Circuit diagram for Octal Encoder
Source Code for Octal Encoder
const int ledPin=13;
const int ledPin2=12;
const int ledPin3=8;
const int buttonPin=2;
const int buttonPin2=3;
const int buttonPin3=7;
boolean lastButton=LOW;
boolean currentButton=LOW;
boolean ledOn=false;
boolean lastButton2=LOW;
boolean currentButton2=LOW;
boolean ledOn2=false;
boolean lastButton3=LOW;
boolean currentButton3=LOW;
boolean ledOn3=false;
int b3=0,b2=0,b1=0;
void setup()
{
pinMode(ledPin, OUTPUT);
pinMode(4, OUTPUT);
pinMode(buttonPin, INPUT);
pinMode(ledPin2, OUTPUT);
pinMode(buttonPin2, INPUT);
pinMode(ledPin3, OUTPUT);
pinMode(buttonPin3, INPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
pinMode(9, OUTPUT);
pinMode(10, OUTPUT);
pinMode(11, OUTPUT);
pinMode(14, OUTPUT);
//digitalWrite(14 , HIGH);
Serial.begin(9600);
}
boolean debounce(boolean last,int bp)
{
boolean current=digitalRead(bp);
if (last!=current)
{
current=digitalRead(bp);
}
return current;
}
void switchOffLED()
{
digitalWrite(5 , false);//a
digitalWrite(4 , false);//b
digitalWrite(14 , false);//c
digitalWrite(6 , false); //d
digitalWrite(9 , false); //e
digitalWrite(10 , false); //f
digitalWrite(11 , false);//g
}
void loop()
{
//Code for the first button from right to left
/*int bs=digitalRead(buttonPin);
Serial.println(bs);*/
//b1=b2=b3=0;
//b1=1;
currentButton=debounce(lastButton,buttonPin);
if (lastButton==LOW && currentButton==HIGH)
{
ledOn=!ledOn;
// Serial.println(ledOn);
//digitalWrite(ledPin, ledOn);
//digitalWrite(4 , ledOn);
// digitalWrite(2 , ledOn);
if (b1==0)
b1=1;
else
b1=0;
}
lastButton=currentButton;
digitalWrite(ledPin, ledOn);
//Code for the second button from right to left
currentButton2=debounce(lastButton2,buttonPin2);
if (lastButton2==LOW && currentButton2==HIGH)
{
ledOn2=!ledOn2;
if (b2==0)
b2=1;
else
b2=0;
}
lastButton2=currentButton2;
digitalWrite(ledPin2, ledOn2);
//Code for the third button from right to left
currentButton3=debounce(lastButton3,buttonPin3);
if (lastButton3==LOW && currentButton3==HIGH)
{
ledOn3=!ledOn3;
if(b3==0)
b3=1;
else
b3=0;
}
lastButton3=currentButton3;
digitalWrite(ledPin3, ledOn3);
if(b3==0 && b2==0 && b1==0) //0 Output
{
switchOffLED();
digitalWrite(5 , true);
digitalWrite(4 , true);
digitalWrite(14 , true);
digitalWrite(6 , true);
digitalWrite(9 , true);
digitalWrite(10 , true);
}
else if(b3==0 && b2==0 && b1==1) //1 Output
{
switchOffLED();
digitalWrite(4 , true);
digitalWrite(14 , true);
}
if(b3==0 && b2==1 && b1==0) //2 Output
{
switchOffLED();
digitalWrite(5, true);
digitalWrite(4 , true);
digitalWrite(11 , true);
digitalWrite(9 , true);
digitalWrite(6 , true);
}
if (b3==0 && b2==1 && b1==1)
{
switchOffLED();
digitalWrite(5, true);
digitalWrite(4, true);
digitalWrite(14, true);
digitalWrite(6, true);
digitalWrite(11, true);
}
if (b3==1 && b2==0 && b1==0)
{
switchOffLED();
digitalWrite(4, true);
digitalWrite(14, true);
digitalWrite(10, true);
digitalWrite(11, true);
}
if (b3==1 && b2==0 && b1==1)
{
switchOffLED();
digitalWrite(5, true);
digitalWrite(14, true);
digitalWrite(6, true);
digitalWrite(10, true);
digitalWrite(11, true);
}
if (b3==1 && b2==1 && b1==0)
{
switchOffLED();
digitalWrite(14, true);
digitalWrite(6, true);
digitalWrite(9, true);
digitalWrite(10, true);
digitalWrite(11, true);
}
if (b3==1 && b2==1 && b1==1)
{
switchOffLED();
digitalWrite(5, true);
digitalWrite(4, true);
digitalWrite(14, true);
}
}
3 Push Button(Toggle) Control using Arduino
Circuit for using 3 Push buttons controls
Source Code for controlling the push Buttons
const int ledPin=13;
const int ledPin2=12;
const int ledPin3=8;
const int buttonPin=2;
const int buttonPin2=3;
const int buttonPin3=7;
boolean lastButton=LOW;
boolean currentButton=LOW;
boolean ledOn=false;
boolean lastButton2=LOW;
boolean currentButton2=LOW;
boolean ledOn2=false;
boolean lastButton3=LOW;
boolean currentButton3=LOW;
boolean ledOn3=false;
void setup()
{
pinMode(ledPin, OUTPUT);
pinMode(buttonPin, INPUT);
pinMode(ledPin2, OUTPUT);
pinMode(buttonPin2, INPUT);
pinMode(ledPin3, OUTPUT);
pinMode(buttonPin3, INPUT);
Serial.begin(9600);
}
boolean debounce(boolean last,int bp)
{
boolean current=digitalRead(bp);
if (last!=current)
{
current=digitalRead(bp);
}
return current;
}
void loop()
{
currentButton=debounce(lastButton,buttonPin);
if (lastButton==LOW && currentButton==HIGH)
{
ledOn=!ledOn;
}
lastButton=currentButton;
digitalWrite(ledPin, ledOn);
currentButton2=debounce(lastButton2,buttonPin2);
if (lastButton2==LOW && currentButton2==HIGH)
{
ledOn2=!ledOn2;
}
lastButton2=currentButton2;
digitalWrite(ledPin2, ledOn2);
currentButton3=debounce(lastButton3,buttonPin3);
if (lastButton3==LOW && currentButton3==HIGH)
{
ledOn3=!ledOn3;
}
lastButton3=currentButton3;
digitalWrite(ledPin3, ledOn3);
}
Friday, June 21, 2019
Magic Matrix in Java
Magic Matrix in Java
Magic matrix is such an odd sized matrix whose sum of each row, column and diagonal are equal. The following video is an implementation of an odd sized magic matrix.
Source code for magic matrix
import java.util.*;
class MagicSquare{
public static void main(String args[]){
Scanner sc=new Scanner(System.in);
int n,i,j,r,c;
System.out.println("Enter the size of the matrix:");
n=sc.nextInt();
if(n%2==0)
System.out.println("Only odd size matrix:");
else
{
r=0;c=n/2;
int a[][]=new int[n][n];
for(i=1;i<=n*n;i++)
{
a[r][c]=i;
if (i%n==0)
r++;
else
{
r--;
c--;
if(r<0 n="" p="" r="">
if(c<0 c="" n="" p="">
}
}
System.out.println("The magic square:");
for(i=0;i
{
for(j=0;j
{
System.out.printf("%3d",a[i][j]);//printf() for formatted output
}
System.out.println();
}
}
}
}
Tuesday, June 18, 2019
Finding the frequency of each element in a Tuple in Python
T=(1,2,3,1,1,5,5,6,1,5,5,6)
print("Tuple=",T)
for i in range(0,len(T)):
if T[i] not in T[:i]:
c=T[i:].count(T[i])
print(T[i],"frequency=",c)
An introduction to recursive functions
def sum(n,s=0):
if n==0:
return s;
else:
s=s+n;
return sum(n-1,s)
#main
n=int(input("Enter a number:"))
s=sum(n)
print(s)
Code to find the largest digit in an integer:
def largest(n,l=0):
if n==0:
return l;
else:
if n%10>l:
l=n%10
return largest(n//10,l)
#main
n=int(input("Enter an integer:"))
p=largest(n)
print("Largest Digit",p)
Code to find the HCF between 2 numbers:
def HCF(n,d):
if n%d==0:
return d
else:
r=n%d
n=d
d=r
return HCF(n,d)
#main
n=int(input("Enter a number:"))
m=int(input("Enter another number:"))
h=HCF(n,m)
print("HCF=",h)
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