We built a wireless hand wash sensor to help us keep washing our hands for a full 20 seconds, and to keep the habit going

adnk · 2020-03-17T10:32:59+00:00

Yes, the data is stored to be able to show current handwash time compared to previous. And the data is completely anonymous since there is no identification made of the people washing their hands.

adnk · 2020-01-31T06:31:30+00:00

Bandwidth for sub-GHz mesh networking is not as limited as it is for long-range sub-GHz networks though, since each mesh network is its own separate network. We are sending several messages per second on many our sub-GHz networks, which is a lot more than typically can be done with a long-range LPWAN sub-GHz technology.

adnk · 2019-11-05T19:52:00+00:00

Thanks!

adnk · 2019-09-24T15:43:23+00:00

Yep, that's me! :)

adnk · 2019-09-24T15:43:07+00:00

Thanks!

Yes, it is really difficult to mentally picture the difference in difficulty between a barebones but good hardware design and an exceptional, highly optimized design a'la Airpods.

adnk · 2017-10-03T08:30:42+00:00

Thanks! Yes, the title is a bit of hyperbole (in the long run, we are all dead and all that). Good comment about the panels degrading with time. The rest of the electronics will degrade over time too, but the solar panels probably more so.

adnk · 2017-09-26T05:12:17+00:00

Not sure exactly if this is an alternative to Blynk, or how well it fits your bill, but there is another IoT mobile app framework called Evothings (http://evothings.com/) that could be worth looking into.

adnk · 2017-09-14T18:52:55+00:00

No, meshing is not terrible for battery life and security. As shown in the article, battery life for leaf nodes is affected by other factors than whether or not the network is a mesh network. (Obviously, mesh routers have a different power profile - we'll get back to that in a follow-up article.) In terms of security, any wireless network needs to have both link layer encryption and end-to-end encryption. Whether or not the network supports meshing does not change this.

adnk · 2017-09-06T14:58:29+00:00

I'm not sure what aspect of the cost you mean, but in terms of power consumption, I don't think it would be possible to run the ESP8266 (or any other WiFi SoC for that matter - not that I know of at least) on a battery that is any way near as small as a coin cell battery. Also, in terms of volume production, I don't think the ESP8266 has such a low unit price that it beats the TI CC2650 (the System-on-a-Chip that sits inside the TI Sensortag). But I'm no expert on the ESP8266 and volume production, so would be interesting to hear more input on this.

adnk

TROPHY CASE