Watchy is an open source E-Ink Smartwatch with a MIT license. Development resources and documentation can be found on the official website watchy.sqfmi.com. There are also several retailers selling the watch hardware. See the documentation for instructions on how to get started with developing for Watchy.
An easy to use Arduino library to send and receive messages between IoT devices (such as the ESP32's or Arduino devices) when using the Texas Instruments CC1101 Low-Power Sub-1GHz RF Transceiver
