Summary
Chapter 7 introduced you to some pretty complex subjects, including the use of external ICs. You are not even half way through the projects yet and you already know how to control a dot matrix display using both shift registers and a dedicated LED driver IC. Also, you learned how to coding things the hard way and then how to code the easy way by incorporating a ready-made library designed for your LED Driver IC.
You have also learned the sometimes-baffling concept of multiplexing, a skill that will come in very handy for many other things as well as dot matrix displays.
Subjects and concepts covered in Chapter 7:
- How a dot matrix display is wired up
- How to install an external library
- The concept of multiplexing (or muxing)
- How to use multiplexing to turn on 64 LEDs individually using just 16 output pins
- The basic concept of timers
- How to use the TimerOne library to activate code no matter what else is going on
- How to include external libraries in your code using the #include directive
- How to use binary numbers to store LED images
- How to invert a binary number using a bitwise NOT ~
- How to take advantage of persistence of vision to trick the eye
- How to store animation frames in multidimensional arrays
- How to declare and initialize a multidimensional array
- Accessing data in a specific element in a two dimensional array
- How to do a bitwise rotation (aka circular shift)
- How to control LED dot matrix displays using shift registers
- How to control LED dot matrix displays using MAX7219 ICs
- How to time pulses correctly to load data in and out of external ICs
- How to store a character font in a two dimensional array
- How to read timing diagrams from datasheets
- How to use the registers in the MAX7219
- How to bypass the SRAM limits and store data in program space
- How to reverse the order of bits
- How to make text and other symbols scroll across a dot matrix display
- The concept of the ASCII character table
- Choosing a character from its ASCII code
- How to find out the length of a text string
- How to write to and read from program space
- How to obtain the address in memory of a variable using the & symbol
- How to use the LedControl.h library to control individual LEDs and rows of LEDs
- How to use the logical operators
- How to make life easier and code development faster using code libraries
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