Just like a a decimal to BCD priority encoder IC 74147
I want to know about a 16 bit to BCD encoder IC
Is it available or need to design with 2 Units of 74147
If yes then what's the IC number ??
Please Guide . . . Thanks !!!!!!!!!!!!!
Yes you do.
Oh so its unavailable 
Doesn't exist as far as I know.
Hmm I see . . Have to design then !!
Yes
Suppose we want to enhance digital input with help of shift registers
Then are all they work as faster as like direct digital inputs ??
NO.
There is a delay that is determined by the rate toy clock the data out of the Arduino into the shift register.
I see
Is there any other development board with same IDE and Language applications with more number of pins than MEGA ??
No.
Hmmmm
Is there any option to tranfer audio files to SD Card via bluetooth or any thing to the SD Card module directly connected to Arduino ??
You can plug in an SD card into your laptop and transfer audio files through that.
Ya that is a traditional method I am applying since 9 months
But I need to add this feature to get things fast and easy a bit !!!
Good luck with that.
Ya thanks 
Do you have any idea about the key is pressed condition in keypad so as to enter digits automatically after press and hold key for a second for a single digit ?
No.
Hmmmmm
Hi,
I didn't quite understand your difficulty.
When transforming decimal to BCD using CI 74147, you get
4 bits.
Now having 16 bits, do you want to turn them into 4 bits?
Ya it will reduce number of input pins for the master Arduino board
Thanks !! that's great !!