ESP8266 Community Forum

There's a new Kickstarter up for a water flow measuring meter - but.. it is $299. I think that is a ridiculous price for this. I suspect an enterprising hacker can clone this for $10.
https://www.kickstarter.com/projects/82 ... ater-meter

Can this ultrasonic range finder for the Arduino do the trick? $1.80
http://www.aliexpress.com/item/HC-SR04- ... 4,201409_1

Plus a $2 ESP-12. And a $1 wall wart. Still $5 left over.

Theory on how they work.
http://www.engineeringtoolbox.com/ultra ... d_495.html

So when can I read about this amazing ESP hack on hack-a-day?

+1! Really interesting, would make a great project, definitely looks doable.

+1 always up for a challenge!

Richard.

Here's their prototype: http://www.ebay.com/itm/TUF-2000M-TS-2- ... 2326ece9de

And here's a reference design: https://www.maximintegrated.com/en/desi ... ml/tb_tab0

Another app note: http://www.ti.com/lit/pdf/snia020

Maybe they are using these in production: http://www.aliexpress.com/item/1MHZ-20m ... 17010.html

These look interesting: http://www.alibaba.com/product-detail/1 ... 03283.html