Blot.re is what? Something about colors and a social network for the internet of things?

His tree's site is empty, but it looks sort of like a Twitter for toasters.

Blot.re's landing page pretty much sums up...nothing. As far as I can tell, it's a way to have a status page much like twitter, but instead of posting a message, you post a color.

From reading the article it seems to me that it's not you, but your sensors that post the colour. So you specify the min/max range of your sensor values, a colour which is mapped to middle of that range and then the colour changes depending on the sensors current value.

Seems like the author of the post is the author of Blot're which might explain why he didn't go into what Blot're is.

If it was made with an ESP8266 instead, the hardware cost would be $10 rather than $60, and it would be simpler to build.