Is it possible to sync Bangle.js 2 time to smartphone time?

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malaire in reply to @Poolitzer
ok, here are quick instructions:

Get ble-current-time-broadcast.bz2 and ble-current-time-broadcast.service
from release 2022-02-04.

You can just run extracted ble-current-time-broadcast directly in terminal, or if you want you can install it as service:
```
; much better time-syncing than default systemd-timesyncd
sudo apt-get install chrony

bunzip2 ble-current-time-broadcast.bz2
sudo cp ble-current-time-broadcast /usr/local/bin
sudo chmod +x /usr/local/bin/ble-current-time-broadcast
sudo cp ble-current-time-broadcast.service /lib/systemd/system
sudo systemctl daemon-reload
sudo systemctl enable ble-current-time-broadcast
sudo systemctl start  ble-current-time-broadcast
```
If you didn't have chrony installed, then you should probably wait some time for it to stabilise.

Then upload ppm_logger.js to Bangle.js 2, it will show one line per 10 minute interval (by default) with average/min/max temperatures, interval length in seconds and measured clock drift in PPM.

Some variance in PPM is expected especially if using default 10 minute interval, so I usually let it run for some time.

Here's what it looks like for me currently (I should probably add logging to file also):

•

Poolitzer in reply to @malaire
I followed your steps, they worked perfectly. Here are my numbers.

1 Attachment

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malaire in reply to @Poolitzer

Yep, that's clearly different. My Bangle.js 2 has about 63 PPM at 19 C and yours is around 71 PPM.

btw, the graph I showed earlier was made with LibreOffice Calc: I measured some temperature/PPM pairs, made a chart of them in LibreOffice Calc and added trend line (polynomial, degree 2).

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