This is in continuation with our tutorials for Interfacing 4-Digit 7-Segment Display with Microcontroller AT89S52. In last tutorial we have interfaced Single Seven Segment Display with Microcontroller AT89S52 to count digits from 0 to F. And we interfaced 2 Digit Seven Segment display to count 00 -99. This project we will Interface 4-Digit 7-Segment display to count 00000-9999 with microcontroller AT89S52. 4-Digit