V7 – 74LS90 Completed Cruise System with 4-bit Comparator
Started as a two-display 74LS90 and 7447 counter circuit and was completed with green/yellow logic, XOR/inhibit correction, 74LS85 4-bit comparator, DIP switch set-speed input, NE555 flashing red stage, and reset/limit logic.
C:\Users\henoc\OneDrive\Documents\control new\final\V7
Circuit Explanation
The completed system uses cascaded 74LS90 decade counters with 7447 display drivers for a two-digit speed display. A DIP switch sets the desired cruise speed as a 4-bit value, which the 74LS85 comparator compares with the live count. Green (0–5) and yellow (6–9) range logic, XOR/inhibit correction, reset/limit logic for invalid states, and the NE555 flashing red warning complete the full GA1 requirement set.
Components Used
Schematic Preview
Proteus Project Files
V7 74LS90 Completed Cruise System with 4-bit Comparator Proteus Project
V7/7 Segment Counter.pdsprj
Proteus simulation
7 Segment Counter.pdsprj
Proteus 8 Professional simulation project for V7 - 74LS90 Completed Cruise System with 4-bit Comparator.
Open using Proteus 8 Professional.
Circuit Schematic PDF
V7 74LS90 Completed Cruise System with 4-bit Comparator Circuit Schematic
V7/7 Segment Counter.PDF
Circuit schematic
7 Segment Counter.PDF
Exported circuit schematic PDF for V7 - 74LS90 Completed Cruise System with 4-bit Comparator.
Truth Tables
V7 74LS90 Completed Cruise System with 4-bit Comparator Truth Tables
V7/project_v07_preliminary_truth_tables.pdf
Truth table
project_v07_preliminary_truth_tables.pdf
Truth-table PDF documenting the logic used in V7 - 74LS90 Completed Cruise System with 4-bit Comparator.
V7 74LS90 Completed Cruise System with 4-bit Comparator Truth Tables
V7/project_v07_truth_tables_with_4bit_comparator.pdf
Truth table
project_v07_truth_tables_with_4bit_comparator.pdf
Truth-table PDF documenting the logic used in V7 - 74LS90 Completed Cruise System with 4-bit Comparator.
Word Report
V7 74LS90 Completed Cruise System with 4-bit Comparator Word Report
V7/project_v07_ga1_report_with_4bit_comparator.docx
Word report
project_v07_ga1_report_with_4bit_comparator.docx
Editable Word report for V7 - 74LS90 Completed Cruise System with 4-bit Comparator.
PDF Report
V7 74LS90 Completed Cruise System with 4-bit Comparator PDF Report
V7/project_v07_ga1_report_with_4bit_comparator.pdf
PDF report
project_v07_ga1_report_with_4bit_comparator.pdf
PDF report for V7 - 74LS90 Completed Cruise System with 4-bit Comparator.
Limitations & special logic notes
Speed values 0–10 are simplified demonstration values; a real vehicle implementation would scale the ranges and use a real speed transducer.