The early Datalink watches receives data over light, and the original intent was to take advantage of a flashing electron beam on a CRT. Timex also offered a Notebook Adapter accessory intended for mobile users at the time, which replicates the data sent from a CRT using a single LED.
The Notebook Adapter is a serial device with a proprietary protocol that was reverse-engineered for this project. With the Arduino device present, the original Timex Datalink software can be configured to use the Notebook Adapter and send data to your watch.
The software is in Arduino and testes on a Teensy LC but the author notes other Arduino compatibles may be suitable also.
Also, this project is very similar to an Adafruit project to revive the Nintendo R.O.B. robot that used analog TVs. An Adafruit Circuit Playground Express was used for that project.
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