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I built my own lightboard to teach my online classes using some UV LEDs, a fluorescent highlighter, and a plain glass sheet.
My $5 Lightboard
Anemometer or a wind speed measuring device is a common weather station instrument. It was costly online, so I built one!
DIY Anemometer: Wind Speed Sensor Device
Extending Morse Code Transceiver to work with digital data. This project achieves a throughput of 20bps, 2x over Morse code.
20bps Digital Data Wireless Transceiver (Laser)
I taught a class on Communication Systems using programming, machines and Morse code.
Morse Code Transceiver
Xamarin saves a lot of programming, testing and maintenance effort by using a shared codebase. You write code, find bugs and fix them!
Xamarin, Sharing is Good
Xamarin enables you to build native apps with a shared C# codebase for multiple desktop and mobile platforms.
Cross Platform Mobile App Development with Xamarin
Many of us would have used a VR headset and seen AR HoloLens ($3000). I made one AR headset from scrap.
Augmented Reality Headset (AR, not VR)
A quick Android app development with Xamarin in C# on Mac.
Android App with Xamarin on Mac