you could try reading:
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This is just a block image downloader. If it is more of that show me demo.
These blocks can be dragged directly into your Blocks Editor workspace.
...
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Okay Great! I am going to test it.
The first, smallest thing you should change is to standardize the number of digits replacing a letter.
For you A = 1, D = 4, L = 12 etc... it is not correct because you will never recognize if 11 is AA or K. It should be: A = 01, D = 04, L = 12. Always two digits.
Besides, someone has already thought of encoding characters into digital form and it is called ascii. You can apply a similar principle to ascii, or simply use ascii. So the solution is to encode not only letters, but also numbers, and then decode everything in turn.
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This is the really great idea for me to convert all codes to ASCII as they can convert 
such a amazing and very easy and useful idea ever tried. I cannot express my feelings i am feeling right now. 
Let me know how to convert Text to ASCII and ASCII to Text in the application (provide any component or extension).
You have a choice of Decimal or Hex, which do you prefer ?
CHAR
0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z
DEC
30,31,32,33,34,35,36,37,38,39,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90
HEX
48,49,50,51,52,53,54,55,56,57,41,42,43,44,45,46,47,48,49,4A,4B,4C,4D,4E,4F,50,51,52,53,54,55,56,57,58,59,5A
You said no letters in the barcode, so I guess Decimal ?
KJD24034M
757468323430333477
Yes, I preferred decimals.
Can barcodes can be ready with letters also?
Which maker supports that and is that widely scannable?
Why not try it with what you have already ?
Yeah, I am just asking , to explore in the deep sea of it. 
Be aware that lower case letters would throw you into three digit decimal values.
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EAN and UPC only numbers, CODE39 and CODE128 letters and numbers.
I am going to use CODE128 
Also see here:
The app is not installing in the device.