On the Subject of Braille
This doesn’t feel right.
See Appendix BLANK in Blind Alley for blank modules identification.
Braille consists of raised dots arranged in a regular grid. Each letter has 2×3 locations, each of which can have a raised dot or not. The following table shows the encoding for Unified English Braille.
- Move your finger over the module to feel the Braille message. The message consists of 4 Braille letters with 6 locations. However, some of the raised dots may be extraneous and some may be missing.
- The locations are numbered in columns from top to bottom, then left to right.
- To find out which locations are wrong, first convert the letters in the serial number to their alphabetic positions (where A=1, …, Z=26).
- Start with the location numbered according to the first character of the serial number plus one.