New version of the app

[traspami]

Hi!
Good and bad news.
Let’s start with the good one:
the new app works :)) (at least on Windows) (we’re still waiting for the Linux version here)
Now the bad one. This is how it looks for us:

Could it be that we're placing the strap incorrectly? Where should the chest strap go? We place the red part right against the waist.

[MarAltadill]

Hi!
We’ve also tried the app and it works for us :) But we’re seeing the same thing — the signal comes out just as distorted :(

[TheAlbertDev]

Important

Remember to write in the forum in English so that future students, whether they are exchange students or not, can understand the conversations.

I’m glad the app works with your device — that’s a big step! It’s not so important whether the ECG looks good or not (that depends more on the electronics, which is outside the scope of the course). However, it’s important to make sure the signal isn't looking bad due to noise/distortion caused by the electronics or the project code.

The signal seems to be centered around a value of 3800, and no ECG waveform is visible. The connection is as you mentioned: black and blue go to the strap, and red goes on the right side of the waist, ensuring the metal part is in contact with the skin. On another note, if you moisten the strap electrodes (the ones on the strap that make contact with your skin, not the black/blue cables directly) with water, the signal quality improves significantly.

Update your repositories, as I’ll download them and take a look.

Do the other commands work correctly (Get LOD state and Stop measurement)?

On another note, I could swear I configured that starting a measurement should request 10 seconds of signal, but I see in the screenshot there are up to 20 seconds. It could be a bug in the app, but it’s also something to double-check in the microcontroller code just in case.

Keep posting updates in this thread so we can track the issue until it’s resolved.

[MarAltadill]

Hello Albert.
In our case commands work properly :)
And aslo we moistened the electrodes and signal seems to be much better! Also, the 10 sec. recording works, but still once is finished it starts from the point it ended on the last measure (at least in our case) so seconds accumulate.
Eventually our singal looks like in the image, is this the shape we aim?

[TheAlbertDev]

Obviously, it’s not a typical ECG, but you can sense that it’s there. I’ll try your code this afternoon/evening to see if I get the same results or if it improves (which would mean it’s something related to the electronics or how the strap/electrodes are connected, which is not important for the project evaluation). It looks promising 😉

On my side, I’ll check in the app about the seconds accumulating. That’s something I hadn’t noticed until now.

[MarAltadill]

We have not commited it yet because the code is not completely commented, shall we put it in the develop branch in case is not the last submit?

[TheAlbertDev]

Yes, please. Merge the developments into develop branch.