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# Timex Datalink Notebook Adapter emulator for Arduino
This is an Arduino project that emulates the [Timex Datalink Notebook Adapter](https://user-images.githubusercontent.com/820984/187855124-5e84451c-f65b-4903-a9eb-f44ddde78eb1.png) using Arduino. This allows the original [Timex Datalink software](https://assets.timex.com/html/data_link_software.html) to send data to [Timex Datalink watches](https://en.wikipedia.org/wiki/Timex_Datalink).
This project emulates the [Timex Datalink Notebook Adapter](https://user-images.githubusercontent.com/820984/187855124-5e84451c-f65b-4903-a9eb-f44ddde78eb1.png) for early [Timex Datalink watches](https://en.wikipedia.org/wiki/Timex_Datalink) in Arduino! It is 100% compatible with the original Notebook Adapter, and works with vintage and modern computer hardware.
![image](https://user-images.githubusercontent.com/820984/187858116-41eeaa2b-e134-4b31-98ab-60f1f2b0d362.png)
This project uses no external libraries and is not dependent on any specific hardware, although it is designed with the [Teensy LC](https://www.pjrc.com/teensy/teensyLC.html) in mind. The Teensy LC has USB serial and an onboard LED, so the board can be used as-is without any external components:
This project is not dependent on any specific Arduino board, although it is designed with the [Teensy LC](https://www.pjrc.com/teensy/teensyLC.html) in mind. The Teensy LC has USB serial and an onboard LED, so the board can be used as-is without any external components:
![image](https://user-images.githubusercontent.com/820984/187859185-94f02df7-64f5-4bb3-bf00-12621f5f3b38.png)
## How does it work?
The early Datalink watches receives data over light, and the original intent was to take advantage of [a flashing electron beam on a CRT](https://www.youtube.com/watch?v=GCHHzw4s5W4&t=1168s). 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:
![image](https://user-images.githubusercontent.com/820984/187865523-3627066b-3a8b-4101-8ddf-83fc5c8493d9.png)
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](https://assets.timex.com/html/data_link_software.html) can be configured to use the Notebook Adapter and send data to your watch:
![image](https://user-images.githubusercontent.com/820984/187858116-41eeaa2b-e134-4b31-98ab-60f1f2b0d362.png)