A smart thermostat is nothing new. But making one built a decade or more ago takes a few tricks. If you want to upgrade your thermostat without replacing it, [geektechniquestudios] shares their solution using a Raspberry Pi Zero to smarten up that dumb controller.
The hardware is decidedly simple: just a Pi Zero and a pair of relays. The relays act as button presses to the old thermostat. The software, though, is decidedly complex. There’s a React server and a Redis database along with some other bits and pieces.
The Nest Thermostat revolutionized the way that people control the climate in their homes. It has features more features than even the best programmable thermostats. But, all of the premium features also come at a premium price. On the other hand, for only $5, a little coding, and the realization that thermostats are glorified switches, you can easily have your own thermostat that can do everything a Nest can do.
[Mat’s] solution uses a Sonoff WiFi switch that he ties directly into the thermostat’s control wiring. That’s really the easy part, since most thermostats have a ground or common wire, a signal wire, and a power wire. The real interesting work for this build is in setting up the WiFi interface and doing the backend programming. [Mat’s] thermostat is controlled by software written in Node-RED. It can even interface with Alexa. Thanks to the open source software, it’s easy to add any features you might want.
[Mat] goes through a lot of detail on the project site on how his implementation works, as far as interfacing all of the devices and the timing and some of the coding problems he solved. If you’ve been thinking about a Nest but are turned off by the price, this is a great way to get something similar — provided you’re willing to put in a little extra work. This might also be the perfect point to fall down the home automation rabbit hole, so be careful!
Revolv, the bright red smart home hub famous for its abundance of radio modules, has finally been declared dead by its founders. After a series of acquisitions, Google’s parent company Alphabet has gained control over Revolv’s cloud service – and they are shutting it down.
Although the Internet of Things (IoT) is a reasonably new term, the idea isn’t really all that new. Many engineers and hackers have created networked embedded systems for many years. So what’s different? Two things: the Internet is everywhere and the use of connected embedded systems in a consumer setting.
Like anything else, there’s a spectrum of usefulness to IoT. Watching The Expanse, the other day (which is not a bad show, by the way), I noticed that if you had the right IoT lights, you could run an app that would change your lighting to suit the show in real-time. I don’t have those lights, but I suppose when the action moves to a dark sub-basement, your lights dim and when you are in a space ship’s reactor room, they turn red, and so on. Fun, but hardly useful or life-changing.
On the other hand, there are some very practical IoT items like the Nest thermostat. It might seem lazy to want to monitor and control your thermostat from your tablet, but if you are frequently away from home, or you have multiple houses, it can be a real positive to be able to control things remotely. With the recent blizzard on the U.S. east coast, for example, it would be great to turn on the heat in your weekend cottage 150 miles away while you were still at work or home. However, the Nest recently had a hiccup during an upgrade and it has made many of their customers mad (and cold). I’ll get back to that, in a minute. First, I want to talk about the problems with deploying something that will be in many varied environments (like people’s homes) that controls something real.
[ZPriddy] was looking for a way to control his Nest thermostats with Amazon Echo. He didn’t want to settle for using AWS or some other hosted service. [ZPriddy] wanted something that he could host and manage completely on his own. The end result is what he calls EchoNestPy.
[ZPriddy] started by learning how to use the Alexa Skills Kit (ASK). ASK is the official SDK that allows enthusiasts to add functionality to their Amazon Echo. Unfortunately for [ZPriddy], most of the example code he found was designed to be used on Amazon Lambda, but that didn’t stop him. After finding a few examples of Amazon Echo requests and responses, he was on his way.
[ZPriddy] chose to implement a simple web server using Flask. The web server listens for the Amazon requests and responds appropriately. It also Oauth2 authentication to ensure some level of security. The server is capable of synchronizing the temperature of multiple Nest devices in the same home, but it can also increment or increment the temperature across the board. This is accomplished with some simple voice commands such as “Tell Nest that I’m a little bit chilly”. If you like Amazon Echo hacks, be sure to check out this other one for controlling WeMo devices. Continue reading “Control Nest Devices With Amazon Echo”→
If you’ve ever lived in a building with manually controlled central heating, you’ll probably understand [Martin]’s motivation for this hack. These heating systems often have old fashioned valves to control the radiator. No Nest support, no thermostat, just a knob you turn.
To solve this problem, [Martin] built a Wi-Fi enabled thermostat. This impressive build brings together a custom PCB based on the ESP8266 Wi-Fi microcontroller and a mobile-friendly web UI based on the Open Thermostat Scheduler. The project’s web server is fully self-contained on the ESP8266.
To replace that manual value, [Martin] used a thermoelectric actuator from a Swiss company called HERZ. This is driven by a relay, which is controlled by the ESP8266 microcontroller. Based on the schedule and the measured temperature, the actuator lets fluid flow through the radiator and heat the room.
As a bonus, the device supports NTP for getting the time, MQTT for publishing real-time data, and ThingSpeak for logging and graphing historic data. The source code and design files are available under a Creative Commons license.
There’s a bright future ahead of us, filled with intelligent computerized assistants that will listen to everything we say and do our bidding. It’ll be like HAL from 2001: A Space Odyssey, but without unverified mission-critical software and a bunch of killing. Until then, we have a few Amazon Echo hacks that tease out a reasonably capable home automation system without a proper API.
This build was inspired by an earlier project that polled the to do list looking for key phrases. Saying, “Alexa, to do, lights on” would turn on an Internet-connected light bulb. Saying, “Alexa, to do, call home” would call a phone number set up with the ‘home’ keyword.
[Glen] has improved that earlier setup somewhat, mostly by getting rid of the requirement to say, ‘to do.’ The Git for the project still shows it’s exploiting the Amazon to do list, but this is a much cleaner build that should end up having a lot more possibilities.
So far, [Glen], or rather, Alexa, can control the temperature of the house through a Nest thermostat, the lighting of a room with a Phillips Hue light bulb, and other random tasks like playing an audio file through the speakers. Not bad, and something that really demonstrates the potential of a smart, connected home.