The coolness of RGB LEDs

Intro Ahhhh LEDs….don’t we love them? Today there is a huge variety of them. But there is one type I particularly like. These 5 mm RGB diffused LEDs, easily available from various sources and quite cheap. Here’s why I like them They are super bright. According to some datasheet which may or may not be what you are buying from less reputable sources, the green LED peaks at 5000 mcd at 20 mA. Your typical,… Continue reading

10002 Short assembly run

Brief progress It is quite clear that my smart home project is going quite slow. It is not that I spent a lot a time on it, but that I have been pretty busy with other life things. But it is moving again now. Motion sensors assembly Once I settled on the type of motion sensor and case, I designed some sensor PCBs . I made a small assembly run of eight sensors just to… Continue reading

Wine lamp

Intro My old Ikea GRÖNÖ lamp was long due for an upgrade to LED, but I wanted to use a strip not just buy a bulb. That is because I wanted the light controllable through my 1000² home automation system. Now, the cool thing about building my own dimmers is that I could dim the light down to very low duty factors, which is pretty good considering the way human eye responds to light levels. As a… Continue reading

Vorpal hexapod

I wanted to have a hexapod robot for a long while now. It just never seemed to be that much of a priority to spend the time or money to build one. Luckily this changed when I found Vorpal. They are selling complete kits or you can build one yourself from the plans that are provided. I was missing only a few servos and the 3D printed pieces, so I quickly decided to build one.… Continue reading

10002 Motion sensors?

Motion sensor madness Picking the right one is not trivial. From left to right – Osram Nightlux, Ikea Molgan, Ebay sensors with sensitivity and timing adjusment (BISS001), smaller ebay sensor with no adjustment, another ebay sensor. As you can see I have looked at 2 different options: use a ready made sensor and fit it with a radio, or build my own. Ikea Molgan I hacked one a while ago – was my biggest preference. It… Continue reading

10002 Temperature sensors?

Intro There is no doubt, that integrated temperature and humidity sensors are the way to go at the moment. I had quite a bit of look at a wide range of sensors and settled for the SI7021. Silabs has a bigger family – most likely the same chip binned on precision – so here are cheaper options to use if I ever want to go for an application that can do with less precision.  Here is a… Continue reading

Simple audio mixer

Intro I have one low cost TPA3116 amplifier which has got more usage than I initially thought. I ended up using it in the living room, it provides enough power and burns only 0.7W from the mains while ON, with no signal. So low that I don’t need to worry about shutting it down when there is no signal, so it’s on all the time. So on to the problem: I need to use it with… Continue reading

Bosch glue pen teardown

Intro My cheap plug in hot glue gun died and looking for a replacement I found this: the Bosch GluePen What does it do? it’s a hot glue gun for 7 mm glue sticks that warms up in 15 seconds. Charges via micro USB. Much better than my old one that needed ~5 minutes to warm up for probably half a minute of gluing. I am very happy because of the fast warm up, wireless operation… Continue reading

10002 Progress

This article is part of my 1000² Smart Home project. Check out the Architecture and Software and then move on to Hardware. An most importantly, check the Lessons learned and why I did what I did. There are already some first results, connecting all parts of the system. Progress Finally, enough pieces of the puzzle are starting to fit together in my Smart Home project, so that I can have some end to end functionality: press a button here… Continue reading