Moteino battery drain

I have recently seen that some standard alkaline AA batteries drain pretty quickly compared to others. Some of my Moteinos manage to run for 100+ days with two standard AA batteries, but lately I have replaced batteries on the outside sensor after 3-7 days!

ATtiny - Back to basics

After a few years using Arduino Pro Minis and now recently ATmega328P-PU chips, I have started playing with the ATtiny85/84. As as programmer this was very confusing. I just assumed I could program the ATtiny the same way as the ATmega328. Oh, was I wrong. I spent countless hours trying to get things to work. I didn't find much info online for my problems either.

Moteino battery life

Today I changed batteries on one of my Multi purpose Moteino sensors. I was surprised to see that the batteries had lasted for nearly 7 months (207 days). 17897040 seconds to be exact. The sensor was located in the bathroom, the warmest room in the house with about 25-26° C. I guess the high temperature had something to say when it came to the batteries capacity.

To compare, the sensor outside lasted 71 days, in shifting weather. Including below 0° C.

A better RFXCOM RFXtrx433E antenna

I have been using the RFXCOM RFXtrx433E USB 433.92MHz Transceiver for a while now and I have noticed that the reception range is sometimes bad. Even without moving it I have found that the weather have a lot to say about how the reception range is. After some experimentation I found that the best placement of the device is high up, of course, but also so the antenna goes parallel with the ceiling. I taped it close to the ceiling so that the antenna pointed out into the room.

Domotiga on Raspberry Pi 2

I have been running Domotiga on the new Raspberry Pi 2 for a few weeks now after the initial months using the "old" Raspberry Pi. And I have to say the performance is very noticeable. I'm controlling Domotiga with the desktop client using VNC. I also control Domotiga with the web interface, but I find it faster to use VNC. Compared to the "old" Raspberry Pi, the response is almost instant, and the CPU usage is never over 25% compared to the the "old" one that used 100% every time Domotiga had work to do. That's the beauty of quad core CPU.

NEXA LMST-606 range problem

As a part of my home automation system, I have a NEXA LMST-606 magnetic switch on the front door. The NEXA LMST-606 is capable of sending "on" and "off" signals when the door is opened and/or closed. The problem is that it has a terrible range when used with the RFXCOM RFXtrx433E USB 433.92MHz Transceiver. With only two open, or closed, doors between the LMST-606 and the RFXCOM, the signal is blocked.

Lessons learned - First year

After a year I will say I have gained some experience in the field of DIY IoT and home automation. The first lesson is that it's not easy to plan what you want and actually go for it. Things and desires change on the way to the goal. I started with a Tellstick Duo, but I feel I outgrew it.

Detect human presence with DomotiGa

After a few days using DomotiGa I found I had the need for the system to know who is home and who is not. There is already a built in bluetooth interface in DomotiGa, but I never had much luck with it, so I disabled it. At my home we are usually 2 persons present at any one time. "The names have been changed to protect the innocent" Wink