(Improvement) Replace Step Down AC-DC Converter (220V to 5V) by Hi-Link-ac-dc about senseowifi HOT 6 CLOSED

Works flawlessly. I took the same on my setup.
http://www.hlktech.net/product_detail.php?ProId=54

In the 7820 it fits perfectly inside this trapezium shaped spot:

(placed on it's own dedicated PCB)

from senseowifi.

Looks good indeed. Why would you recommend this one over the one I've linked?

from senseowifi.

Perhaps because it comes in a enclosure?

(inside it's pretty much the same, I guess)

Actually that might be preferable of sorts, as there is water around and you might would like the idea of some extra "shielding"... Besides that it's like a question of personal taste. I just took this one, as your suggested one was not available at my be trusted retailer.

from senseowifi.

Fine by me. Please create a PR against the README.md as an alternative product in the components table.

from senseowifi.

Hi, i have another question regarding the supply voltage.

The senseo µC is powered the whole time with 5V via a capacitive divider and zener diode. Have you tried using its supply voltage to power the WeMos module instead of installing a separat step-down converter?

Thank you for your project....i hope to make my coffee maker smart, soon :D

from senseowifi.

Yes. I tried and I did a few thought experiments on the topic with colleagues. The problem is (please correct me if you disagree) that such a circuit has a narrow operating point and experiments showed that voltage drops as soon as more than a few milliamps are consumed.

Another problem is the missing divide of electrical potentials between the Senseo supply and the USB connection (think optocouplers).

I very much prefer the decoupled solution for its simplicity and the flexibility in build in troubleshooting. Lastly and maybe most importantly: The solution comes as safe as it can get (I hope :) ).

I'll close the issue because the "improvement" found its way in the README. Feel free to continue with the discussion!

from senseowifi.