3 Digit Dot Matrix Display with SPI interface is an advanced version of recently published 7×5 Dot Matrix Character Generator project. This design is more complex as it contains 4 microcontrollers. Three PIC16F88 were used to control 7×5 Dot Matrix Displays
Currently only numbers 0-9 and a few selected letters are supported like A,B,C,I,P. For additional characters you’ll need to modify Slave source code to generate a correct display sequence. More information can be found in the assembly code available at the bottom of the page. Here is the design schematic. Master PIC operates with 20MHz clock source.
Click to download design assembly source code,2 files (Mater/Slave). You may also be interested in similar post about SPI communication like 7-Segment Display with SPI PIC16F876A.