I've worked on a range of projects over the years, and these are a few I'm especially proud of. Some are open-source, so feel free to explore the code or contribute if you have ideas to improve them.
An interface that uses a parallel port to handle input and output signals between a computer and external hardware.
github.com
icon by Anditii Creative from Noun Project (CC BY 3.0)
An Android app that uses NFC to log student attendance, notify parents via SMS, and sync data with a web admin panel.
github.com
icon by ARIF IMRON from Noun Project (CC BY 3.0)