HM-TRLR-D-868 WITH ARDUINO MEGA

HM-TRLR-D-868 COMMUNICATION WITH ARDUINO  MEGA 2560

SENDER SIDE CODE EXAMPLE

//char incomingByte = 0; // for incoming serial data
int cntr = 1;

void setup() {
  Serial.begin(9600);
  Serial1.begin(9600);
  Serial.print("sender\n");
}

void loop() {

  if(Serial.available()> 0)
  {
    //Serial.print("receving::");
    //Serial.println(Serial.read());
    //delay(1000);
    //Serial.print("sending:");
    Serial.println("1234");
    //Serial.write(cntr);
    // Serial.print("\n");
    cntr++;
    //delay(1000);
  }
  else
  {
      Serial.print("0\n");
  }
  delay(1000);



RECEIVER SIDE CODE EXAMPLE

//int counter = 1;

void setup()
{
  Serial.begin(9600);
   Serial1.begin(9600);
  Serial.print("receiver\n");
}

void loop()
{

  if(Serial.available() > 0)
  {
    //int incomingbytes = Serial.read();
    //Serial.print("counter");
   // Serial.write("counter::");
    ///Serial.write(counter);
    //Serial.write(1);
    delay(1000);
    Serial.print("receving::");
   
    //Serial.println(incomingbytes,DEC);
    Serial.print((char)Serial.read());
    Serial.print("\n");
   
    //counter++;
  }
  else
  {
      Serial.print("not available\n");
  }
     
  delay(1000);

}


CONNECTIONS WITH ARDUINO MEGA

ARDUINO MEGA 2560 WITH HM-TRLR-D-868:

Hm-TRLR_868	ARDUINO MEGA 2560
5V	5V
GND	GND
TX	RX
RX	TX
Gnd	Gnd
Sleep	gnd

prime number using python

# Python program to check if the input number is prime or not

num = 407

# take input from the user
# num = int(input("Enter a number: "))

# prime numbers are greater than 1
if num > 1:
   # check for factors
   for i in range(2,num):
       if (num % i) == 0:
           print(num,"is not a prime number")
           print(i,"times",num//i,"is",num)
           break
   else:
       print(num,"is a prime number")
     
# if input number is less than
# or equal to 1, it is not prime
else:
   print(num,"is not a prime number")

Arduino Default Fuse bits

Arduino Default Fuse Settings

Here are the default fuse settings for each Arduino from the boards.txt included with the Arduino development software.

To understand more about the fuse settings for your microcontroller, visit Engbedded’s AVR Fuse Calculator.

To write fuse settings, you will need a programmer with this capability. I use Mighty Ohm’s high-voltage rescue shield available here.

Arduino Uno

Low Fuse	0xFF
High Fuse	0xDE
Extended Fuse	0x05

Arduino Duemilanove or Nano w/ ATmega328

Low Fuse	0xFF
High Fuse	0xDA
Extended Fuse	0x05

Arduino Diecimila, Duemilanove, or Nano w/ ATmega168

Low Fuse	0xFF
High Fuse	0xDD
Extended Fuse	0x00

Arduino Mega 2560

Low Fuse	0xFF
High Fuse	0xD8
Extended Fuse	0xFD

Arduino Mega (ATmega1280)

Low Fuse	0xFF
High Fuse	0xDA
Extended Fuse	0xF5

Arduino Mini

Low Fuse	0xFF
High Fuse	0xDD
Extended Fuse	0x00

Arduino Fio

Low Fuse	0xFF
High Fuse	0xDA
Extended Fuse	0x05

Arduino BT w/ ATmega328

Low Fuse	0xFF
High Fuse	0xD8
Extended Fuse	0x05

Arduino BT w/ ATmega168

Low Fuse	0xFF
High Fuse	0xDD
Extended Fuse	0x00

LilyPad Arduino w/ ATmega328

Low Fuse	0xFF
High Fuse	0xDA
Extended Fuse	0x05

LilyPad Arduino w/ ATmega168

Low Fuse	0xE2
High Fuse	0xDD
Extended Fuse	0x00

Arduino Pro or Pro Mini (5V, 16 MHz) w/ ATmega328

Low Fuse	0xFF
High Fuse	0xDA
Extended Fuse	0x05

Arduino Pro or Pro Mini (5V, 16 MHz) w/ ATmega168

Low Fuse	0xFF
High Fuse	0xDD
Extended Fuse	0x00

Arduino Pro or Pro Mini (3.3V, 8 MHz) w/ ATmega328

Low Fuse	0xFF
High Fuse	0xDA
Extended Fuse	0x05

Arduino Pro or Pro Mini (3.3V, 8 MHz) w/ ATmega168

Low Fuse	0xC6
High Fuse	0xDD
Extended Fuse	0x00

Arduino NG or older w/ ATmega168

Low Fuse	0xFF
High Fuse	0xDD
Extended Fuse	0x00

Arduino NG or older w/ ATmega8

Low Fuse	0xDF
High Fuse	0xCA

vi editor commands

vi filename.ext create the new file in the pwd.

"i"-------insert the cursor

"a"----write after cursor

"A"----write at the end of the line

:w----quit from the current file

:wq---save and quit from the current file

ESc----terminate from insert mode
:g/^$/d--------remove all empty line from the current file
shift+zz-----exit from the current file

Replace, Join, Split, Reverse, Uppercase & Lowercase in python

del keyword usage in python

"""
Created on Thu Aug 29 16:29:56 2019
@author: anil durgam
date:29-08-2019
"""
f = 11;
print(f)
  del f
print(f)

output:
    del f
    ^
IndentationError: unexpected indent

global key word usage in python

"""
Created on Thu Aug 29 16:29:56 2019
@author: anil durgam
date:29-08-2019
"""
f = 101;
print(f)
# Global vs.local variables in functions
def someFunction():
  global f
  print(f)
  f = "changing global variable"
someFunction()
print(f)


output:
101
101

changing global variable

declaration and re-declaration of the variable

"""
Created on Thu Aug 29 16:29:56 2019
@author: anil durgam
date:29-08-2019
"""
# Declare a variable and initialize it
f = 0
print(f)
# re-declaring the variable works
f = 'guru99'
print(f)

output:
0
guru99





example 3:


"""
Created on Thu Aug 29 16:29:56 2019
@author: anil durgam
date:29-08-2019
"""
# Declare a variable and initialize it
f = 101
print(f)
# Global vs. local variables in functions
def someFunction():
# global f
    f = 'I am learning Python'
    print(f)
someFunction()
print(f)

output:
101
I am learning Python

101

defination in python

"""
Created on Thu Aug 29 16:29:56 2019
@author: anil durgam
date:29-08-2019
"""
def main():
    print("hello world\n");
   
if __name__ =="__main__":
    main()
   
print("testing")

NUMBER SERIES BASIC TESTING

/**************************************************
** written by :ANIL DURGAM
** NUMBER SERIES TESTING VER 1.0
**DATE:29-08-2019
**************************************************/



#include <stdio.h>
#include <stdlib.h>

int main()
{
    int first_num,sec_num,third_num,fourth_num,next_number;
    int first_diff,second_diff,third_diff,fourth_diff;
    printf("please enter the FOUR number after every number hit ENTER\n");
    scanf("%d%d%d%d",&first_num,&sec_num,&third_num,&fourth_num);
    printf("first number=%d,\nsecond number=%d,\nthird number=%d,\nfourth number=%d\n",first_num,sec_num,third_num,fourth_num);
    first_diff=sec_num-first_num;
    second_diff=third_num-sec_num;
    third_diff=fourth_num-third_num;
    if(first_diff==second_diff)
    {
        if(third_diff==second_diff)
        {
            next_number=first_diff+fourth_num;
            printf("next number is ==%d\n",next_number);
        }
        else
        {
            printf("third and fourth number is not matching\n");
        }
    }
    else{

        printf("number not matching\n");
    }

    return 0;
}

OUTPUT:

please enter the FOUR number after every number hit ENTER

12

24

36

48

first number=12,

second number=24,

third number=36,

fourth number=48

next number is ==60

format type in c language

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int a=789,b=1234;
    printf("a=%3d, b=%4d", a, b);
    return 0;
}

output:
a=789,b=1234

input is
a=9,b=4;
a=  9, b=   4