While the onboard red LED works, the performance becomes excellent with an external LED. With a bright white LED, I am able to sync a Datalink 150 watch from about 3 feet away without errors (compared to about four inches with the onboard LED).

Add documentation for adding an optional external LED to the Teensy LC for better performance.

This project has come this far without the .cpp files including their own headers. Whoops!

Let's add them to the .cpp files! 🐛

Hi,

Thank you for the awesome software!

I've adapted the project to work on the Digispark board, and the code is available in my fork.

I had to use a software implementation of the serial port because the Digispark board lacks hardware for this, but it turned out to work great. The modifications are minimal. I also added an external white LED, and I can sync the device from two feet away from the computer without any problems.

My goal now is to 3D model a case in the shape of the original Notebook Adapter but with the tiny footprint of the Digispark 😀

Are you interested in a pull request, or would you prefer to keep it as a separate fork?

Add Release Drafter to this repo so we can have clean, automatic release notes with releases:

https://github.com/release-drafter/release-drafter

Hello

I would like to use your Project for my Timex Watch but I can't get it to work and hope you could help me a find the error.

My configuration now:

• Arduino Nano flashed with the Project files without errors.

• VM with Win98 and successful installed USB to Serial Driver

If I try to configur the Notebook Adapter I get an error :-(

Do you know what is wrong?

Thanks a lot, Pegi

To make using the pico easier you can release a uf2 file similar to this repo.

https://github.com/famiclone6502/DIY_Datalink_Adapter/tree/main/pico

which can be dragged to the device without compiling anything.

Add a list of software that has been tested compatible with this adapter 👍

Hi,
I have been using the Linux Datalink library by David Fries (https://github.com/dfries/datalink_ironman) to sync my watches in the past.
It supplies an application to send data provided by a datafile to a serial device and some code for a teensy board to control the led. Since the Teensy 3.+ boards won't be available anymore, I intended to switch to the 4.+ generation. The code supplied in the library unfortunately only works with the 3.+ generation and I wasn't able to update the code due to a lack of knowledge. So I tried using the timex arduino code in combination with the Teensy 4.+ and the Linux Datalink library datafile application. The code seems to run on the teensy 4.0, the internal LED lights up when serial data is received, but the timing seems to be an issue. I can not tell whether the timing is supplied by the sender or the receiver, as I do not fully understand the code and the concept behind it. (I understand the very basics with the data having to be transmitted at 60hz, sync bits, databits and so on, but do not understand how this is related to the baudrate of the transmission or the internal clock of the teensy or arduino board connected.)
Maybe it would be worth having a look at supporting the Linux Datalink library. I'll gladly offer any assistance and any help I can be of, although it might not be much.

Best regards

Benny

In timex-datalink-arduino.ino's loop function, LedBlaster::emit_byte is called before NotebookAdapter::emulate:

NotebookAdapter::emulate occasionally reaches back to LedBlaster functions to switch modes:

So it'd make sense to call NotebookAdapter::emulate before calling LedBlaster::emit_byte, even if the adapter functionally works right now

Small nit: the screenshots in README.md include a background color. Crop these screeenshots to only include the Timex Datalink software windows.

This adapter is currently written for the Teensy LC, but there really isn't anything fancy about the LC that is being used in this project. We're just talking serial while making a pin go high and low with sleep statements in-between.

Pretty much every Arduino board that has UART buit-in can run this project. Even ATTINY85 micro controllers could probably run this thing with software serial:

Let's add support for multiple Arduino boards! For starters, we can support the RPi Pico by wrapping this macro with "if" blocks to check if RPi-specific macros are defined. If so, use a pin for its onboard LED:

This adapter works with the original Timex Datalink software, but the Ironman Triathlon with Data Link software shows this message when attempting to use this project as the Notebook Adapter:

The BeepwearPRO 1.03 software shows this message when performing the Notebook Adapter calibration or attempting to transfer data with the software:

The Timex Notebook Adapter is not compatible with your watch or your operating system.

Here's the error during calibration:

Here's the error during data transfer:

Here is the About information from the software:

The original Notebook Adapter works fine with Windows 98 SE and a physical RS232C port, so I suspect that the BeepwearPRO software is attempting to use hardware flow control. This Arduino project does not utilize flow control, and assumes the command mode or data mode states form the traffic. It will likely be necessary to emulate the flow control on the Arduino project to give the software what it's looking for.