Make A Low Cost Digital RPM Meter complete project with project report.

this is a complete RPM meter project with schematics PCB ans all mechanical parts, projects report also there, see it here >> <a href="https://sites.google.com/site/ehobbyprojects/low-cost-digital-rpm-meter-introduction" target="_blank" rel="nofollow noopener noreferrer">Making a Low Cost Digital RPM Meter (Working and Tested) - Ehobbyprojects</a>