Learn about debouncing at The Ganssle Group's website.
View the import code for Falstad Sim.
Go to the PCB BOM on Digikey.
Browse the project files.
Download the entire project as a .ZIP file. (Made with 7Zip. 27,061,477 bytes. SHA256: 241350bc02a447c28c7cff2c482f6061045c3f05c8ccf862e78eb1598f7c5aca)
Watch the youtube video I made, explaining how I designed and simulated the circuit(s), then created and assembled the complete PCB.