problem with #include <Keypad.h> library

Hello, I am working with keypad library which works good but when you save the key or data from keypad on the eeprom of microcontroller it is stored in ascii hex form and I do not know how to work with this data.

Are there any form to convert ascii hex data in decimal data??

thanks and sorry for my english.

You can use any 8-bit binary value for your keys as long as that value is not 0 which represents NO_KEY.

For digits it is easy to convert from ASCII to binary; just subtract ‘0’ (the ASCII value for the zero character).