Auto DST adjustment

We are close to that time of the year, when Daylight Saving Time (DST) starts.  It is intended to save on energy use, however studies have found this to be questionable, even contrary – energy use increases in some cases. The change itself causes a number of inconveniences. For me DST start/end means adjusting a number of clocks around…

Physical vs Virtual

The Raspberry Pi, a $35 credit card sized computer, is a popular choice for home automation projects. I am running few of those at home myself. But what is the true cost of these, is the advertised cost of $35 really all you spend?  Before you know it, you throw in  more bucks for a decent power…

DIY Internet connected smart humidifier

I worked on creating a Internet connected humidistat last week using my open source WiFi relay project as platform. We observe quite dry air at our house, I suspect this is due to the fact that we use fan coils for heating/cooling. Humidity levels at home are usually below the 30% mark, which poses a health risk along with uncomfortably dry…

Making IFTTT (If This Then That) talk to Node-RED

IFTTT (short for “If This Then That”) is a popular service which lets you trigger actions based on certain events that occur around the Internet. It is missing an important functionality (IMHO), namely WebHooks. A WebHook is an HTTP callback: an HTTP POST that occurs when something happens; a simple event-notification via HTTP POST. I explain…

WiFi Thermostat with weekly scheduler

Edit: The project is now available for sale in my shop, you can grab one here: [product id=”3785″]   The WiFi SSR board project changed a bit and I use classical relays instead of SSRs now. The reason is that SSRs tend to get quite hot when switching larger loads, and the 8A relays I last…

IoT tech talk recording

Thanks to all that participated in the IoT tech talk session that was held late yesterday, as promised I am adding a recording of the session It was suggested that the topic of the next hangout will be the ESP8266, I’ll set up some time and make an announcement post.   Page views: 3238

MQTT topic tree structure improvements

I’ve been unhappy with my old MQTT topic tree structure for quite some time now and did some thinking/research on how to improve it. Google pointed me to Tinkerman’s article on similar subject, and I started planning on improvements. I will repeat a quote I used in my last post “If you can’t measure it, you can’t improve…

Duck DNS updater in Node-RED

Dyn and No-IP have been for long time my choice for dynamic DNS, but both have recently made steps towards commercializing their services and implementing monthly confirmation process. I think it is time for me to move away and look for alternative. DuckDNS seems to be exactly what I was looking for, easy to use, reliable…