Open-source smartwatch that is fully arduino programmable (run by an ESP32), usually lasts 5-7 days and costs around $50.
Quite a few watchface examples exist online. From what I understand, the watchface is the firmware for this clock,
so no too easy changes there.
There are assembly kits with a case that can be bought for some $ more that will keep the watch a bit more safe (though not e.g. swimmingpool ready). The watch/display so far only exists in square shape.
A huge array of tutorials focusing especially on ESP32 - explanations of working with different sensors (magnetic, light, touch, temperature and humidity, ...), different protocols (http, mqtt, ...), and larger guides like a cloud weather station.
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).
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.
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