For some IoT/Smarthome projects it makes sense to stop dependence of external power source (like batteries, or AC/DC adapters).
Hydro-generator ($5-10) provides by spec 5V 10W power. De facto, it gives a little more than 1A at full water stream. I.e. 6W in best case scenario.


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I made long way through different frameworks for microcontroller ESP8266 until I found Homie. No discussion here why it's the best and what's its pros and cons over other frameworks. Do your home work ( Read more... )

Very useless article - who else buys Windows tablet on ebay from China mainland?
I bought it with Win8 couple of years ago. Now it upgraded to Win10. The GUI became in Chinese. Google has zillion pages how to change the interface language from English to other latin-letter language... not helping.
( Baby steps... )

Никому неохота ремонтировать иммерсионный насос - ремонт непростой, отнимает много времени, запчастей днем с огнем не найдешь, фекашки опять-же... Проще поменять насос целиком.

Изучаем лажи строителей.
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Problem:
1. A charger for every device requires separated wall outlet.
2. There is charge control means per port. They impact the charge and/or need to be transferred from port to port.
3. Multiport USB chargers does not have enough ports for all devices (not for charge but for being ready). And they don't solve item #2.

Solution:Build a custom ( Read more... )

Problem:1. In winter direct wind freezes hands when riding. Even the best and warmest gloves don't protect from cold well enough ( Read more... )