Am using pic16f877a which my pi are 44 and I wan to display message on my dot led up to 70 leds. Plz what can I do because I need more port so that it can display
I ask dor additional port to run my led and I was told to use 74ch595 but I try it it not working plz can you explain how to use it and how to call the port d because am using my port b for the 595
I would personally prefer to use a parallel port expansion, such as the 74HCT373/4 or something like that. This is because the expansion of pins with shift register in series, in case of some error (although unlikely if all components are on the same board) will only propagate the error forward. In other hand, with I/O expansion in parallel, at each new refresh the value will be updated, superposing any error.