If you do not have a neutral wire, it would be smart to choose “no neutral switch” for the project. This is especially important if you are renovating an older house or apartment. So before you are going to buy a big amount of smart light switches, make sure if your walls have the neutral wire installed. The short answer is - Yes, you should! Common smart switches require a neutral wire. what is a neutral wire? Should you care about neutral wire when choosing a switch? Now that you are considering using smart switch for your home, you will notice there are many different options available such as HomeKit smart switch no neutral wire. or Zigbee/Z-Wave no neutral smart switches. You can also help me by clicking on the affiliate links on the posts, they are all properly labeled.This article explains what is a neutral wire, how to make sure if you have a neutral wire, and what to do if you do not have it to choose a smart switch no neutral. If I have helped you somehow or you find this blog useful or even interesting and you want to help me keep writing about all this stuff, here you have the old "buy me a beer" button. I've spent half my life working with computers creating virtual products, now I've moved to the physical part of it, much more fun! Please enable JavaScript to view the comments powered by Disqus. The ESPurna firmware is released as **free open software **and can be checked out at my Espurna repository on GitHub. It's still under development but you can give it a try. Today I've been updating my ESPurna firmware with the HLW8012 library to support the Sonoff POW. Check my post about the HLW8012 a few days ago for a deeper look into it and a library for ESP8266 and Arduino to use it. For the last days I've been mostly playing with the HLW8012. Instead I soldered a 4 pin header and flashed my own firmware to the device. But if you have read me before you might already know I'm not going that way. You can use the POW with the official eWeLink app. It almost looks like part of the enclosure. I still love how the button peeks out of the box. The enclosure is the same as in the TH10 and 16. The device looks solid, albeit a bit to big. Quality of the new Sonoff line (TH10, TH16, POW and DUAL) is pretty good and that's why they recently got the CE mark from the EU. If they can sell that for under 15€ it's a winner. I will even add a third option to the list and it will make my perfect device, and hopefully next Itead release: It's like if Itead was teasing us with different options but forcing us to choose between a nice interface for external sensors or the power monitor feature. The button is, of course, tied to GPIO0 so you can use it to enter flash mode on boot.īut the most important difference from my point of view is that the Sonoff POW lacks the sensor interface I talked about in my post about the Sonoff TH10 and TH16. Like the TH16 it has two LEDs, a red attached to GPIO12 like the relay (so it will be on whenever the realy is closed) and a green one on GPIO15. The relay is rated Detail of the AC/DC components The relay is almost exactly the same as in the TH16, a Honfa HF152F-005-1HST, also rated or And the programming header sits in the same place. The diode bridge has been moved closer to the edge of the board and the creepage slots run deeper into the DC side of the board. The HLW8012 sits exactly where the header for the RF module is in the TH16. Detail of the HLW8012Ī lot of components have been moved to new positions or removed. Also, 470kOhm resistors left of the manganese one are the upstream side of the voltage divider that feeds the voltage monitor pin of the HLW8012. The IC reads the difference in voltage at the edges of the resistor to calculate the current flowing through. You can see the** 1 milliOhm manganese-copper resistor** in the center of the board. The schema of the POW around the HLW8012 is almost the same as in the datasheet. I wrote about the HLW8012 a few days ago, so I will not talk a lot about it here. The main component of this is the HLW8012 (the SOP8 packaged IC in the picture above). Obviously the POW has some circuitry for the power monitoring. Again, the Sonoff TH16 (left) and the Sonoff POW (right) The Sonoff TH16 (left) and the Sonoff POW (right), spot the differences. What's new?Īctually, the Sonoff POW layout shows some very significant differences to that of the Sonoff TH16, for instance. Do you want to remotely monitor your devices energy consumption? Buy a POW. I'm not saying they copied me, just that the Sonoff POW makes my hack utterly unnecessary. And the POW is Itead's answer to my hack. Some months ago I wrote about a hack I did to one of my Sonoff devices to be able to use a simple current sensor to monitor my washer machine process and alert me whenever my laundry was done.Ī few weeks ago Itead Studio released two new models for their Sonoff line, the POW and the DUAL.
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