Update README.md

README.md

@@ -20,3 +20,17 @@ and web part which uses phoenix to display live and historical data.
 
 Sensors_hub - which aggregates historical data and displays live changes on web.
 It is hosted on heroku and can be viewed at [`sensors hub`](https://sensors-hub.herokuapp.com).
+
+## Short demo
+
+[video](https://twitter.com/Dreat_/status/939890791115296768)
+
+### What is happening?
+
+There's Elixir app with Phoenix fronend opened, showing sensor output.
+Sensors are connected to raspberry pi. When sensors are dry it will show cactus, when wet it will show water drop.
+First there's humidity sensor - if we spray it, the second image will change. As it was not dried properly you can see some changes later, as water drops flows down the sensor.
+Next there's hydration sensor put in the glass of water - first image will change.
+Below the images are charts with sensors data grouped by hour.
+
+Finally "warning" button is pressed, and buzzer turns on. "Warning" button is a switch, so pressing it again turns the buzzer off.