Using RFM69CW instead of RFM12B

The rumors for RFM12B’s end-of-life two years ago seem to have been highly exaggerated now and the popular RF module is still available in abundance. HopeRF has introduced a pin-compatible upgrade, the RFM69CW. The module itself offers improved sensitivity and range compared to the RFM12B (+30%) at the cost of increased power consumption, making it probably a…

Speech generation with Node-RED

I am flooded with all sorts of notifications on my phone and that gets a bit annoying after time. Email, calendar, SMS, social apps, instant messengers, all sorts of push notification alerts and so forth mean I physically pick my phone to check what’s beeping probably 50+ times a day. One comes to the point to ignore…

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: 3244

Google video tech-talk hangout anyone?

I’ve been meaning to hold a video Google hangout session on IoT topics for some time now, how about giving it a try? I imagine it as informal 1 hr tech-talk with the following structure 35 min presentation of a certain topic by a community presenter 15 min comments, Q/A on the presented topic 10…