Building an Open Source Nest

An anonymous reader writes "Google's recent acquisition of Nest, the maker of smart thermostats and smoke detectors, has sparked concerns of future plans for the devices, and how Google's omnipresent thirst for information will affect them. Thus, a team of engineers at Spark sat down and roughed out a prototype for an open source version of Nest. It looks surprisingly good for such a short development cycle, and they've posted their code on Github. The article has a number of short videos illustrating the technology they used, and how they used it. Quoting: 'All in, we spent about $70 on components to put this together (including $39 for the Spark Core); the wood and acrylic were free. We started working at 10am and finished at 3am, with 3.5 engineers involved (one went to bed early), and the only work we did in advance was order the electronic components. We're not saying that you can build a $3.2 billion company in a day. But we are saying that you can build a $3.2 billion company, and it's easier now than it's ever been before.'"

Comments

What?

[r.freeman]

What is the Nest. Do they mean like a natural nest build by bees or what - it is not clear form the summary, is it just me who doesn't find Nest an obvious thing like Apache or Linux that doesn't need introduction?

The hard part

[TheloniousToady]

The hard part isn't building a smart thermostat. The hard part is finding somebody simultaneously dumb enough and rich enough to pay $3.2 billion for a thermostat company.

Re:The hard part

[AthanasiusKircher]

The hard part isn't building a smart thermostat.

Meh. The hard part is realizing that you should NOT be trying to build a thermostat, period. Static temperature is relatively useless for comfort, which is why people end up moving the thing up and down all the time.

Our bodies don't sense temperature directly. They sense heat transfer, which involves evaporation rate of perspiration in addition to convection. This is the basis of "wind chill" (increased convection increases heat loss) and "heat index" (humidity reduces evaporation).

If there were actually a smart tech company out there designing such a thing, it would do something like keep a relatively constant dew point in the summer. The temperature is irrelevant. It can be 82 degrees and perfectly comfortable in my house, but on other days it can be 70 and unbearably stuffy. Cooling the house on hot non-humid days is stupid; having to adjust the thermostat down on cooler humid days just adds cost. (This is relevant in the winter as well. When it's really dry in the house, you often need a different temperature to maintain comfort than when humidity is at normal levels.)

It would be much more efficient to just stop the whole "thermostat" idea altogether... if we're really after "comfort" with least energy expenditure, why not program our houses to respond to what actually makes us comfortable (which is a more complicated formula taking humidity and temperature into account), rather than a scientific abstraction like temperature that has little human relevance?

Been there done that

[WaffleMonster]

Throughout the years I have seen instances of precisely this kind of arrogance in various forms.

Everything always "seems easy" at first glance on the surface. This is more often than not a reflection of gaps in ones understanding or failure to consider the problem space with sufficient detail.

The other major issue is failure to understand the sometimes monumental difference between building something that "works for me" vs "works for everyone".

Anyone can hack together an arduino that flips a relay when temperature sensor reads outside of a certain threshold and package it up to look like a cheap version of the nest. This proves precisely NOTHING in my estimation.

Cold zones

[unixcorn]

I just bought a new thermostat. I really wanted a Nest because of it's cool factor however, I ended up buying a Honeywell. First, the Nest isn't as advanced; for example, the Honeywell has some features that allow me to run the fan periodically throughout the cycles. It also allows me to add an additional "slave" thermostat and average the temperature between my upper and lower levels. While the Nest allows you to view multiple thermostats in a single interface each stat required separate HVAC systems. The Honeywell also comes with a remote control that sense the temperature where you are sitting and will adjust the set point to make you comfortable. The bottom line is that sometimes new and cool isn't as good as tried and true when you actually do some research.

Re:Typical Open Source Fan post

[kwalker]

Or, you know, use hand tools...

They're not saying they could build Nest for $70 in parts, they're saying they built a nest-clone device in less than 24 hours for about $70 in parts. Their time was theirs to spend, and they're not "marketing" this.