That gives us an easy way to control LEDs a row at a time, and that’s how the controller will work.įIGURE 1. To turn on LEDs in a row, we apply current to that row’s anode pin and sink current through the cathode pins for the corresponding LEDs we want to turn on. The LEDs for our project require common-anode connection for the rows and common-cathode connections for the columns. To start, look at a 5x7 LED module that provides a matrix of LEDs ( Figure 1). A programmable system on a chip simplifies controller hardware and software.C code addresses the proper rows of bits in an EEPROM to get and display characters.An MCU (microcontroller) stores and uses bit patterns to represent letters, numbers, and punctuation marks.
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