Tools for program an Arduino with a Raspberry Pi via SSH. Using PlatformIO Core on Raspberry to use an Arduino from the command line.

A comprehensive beginner's guide to setting up Arduino programming from vim and the commandline.

Starts with sample blink program, with classic Arduino board,
but quickly moves on to usage with an ESP8266 (so, easily adaptable to ESP32 boards) and with an included library (in this case Adafruit Neopixels).

A display constructed out of common materials, giving you HMD overview of a connected sensor (through bluetooth).
Idea can probably be converted slightly for a more thorough / programmable HUD on the glasses.

Prototype presented here was roughly 70€

Creating a weather station for air pressure, temperature, rain, humidity (soil and air).

An extensive introduction to all things Arduino and circuitry - goes through setting up and using Arduino, various electrical components, foundations of electrical engineering, analog parts, communication with computers, and more.