Projects

ATtiny85 mailbox sensor

The postman always rings twice. Well, in my world he doesn't ring at all. That's why I created this little device that tells me when the postman has delivered my snail mail. I would like this device to be small enough to fasten in the mailbox lid (in Norway most outside mail boxes have a top lid that swings upwards).

ATtiny85 PIR sensor

This is my second project using the ATtiny85. I have previously made, and use, these PIR sensors with "power hungry" Arduino Pro Minis. I usually have to replace the batteries in these devices every 2 months. It depends on how much we move in the rooms they are located. They use 1000mAh CR2477 coin cells. These batteries are quite "big", compared with other coin cell batteries.

Moteino freezer monitor

I bought four ER14505 LS14500 AA 3.6V 2400mAh lithium batteries and battery holders for PCB and thought I should use the rest of my Moteinos. I had three of them laying around that I don't use.

For this project I use the same code as my other sensors around the house, so the only job was to get it on a vero board, solder and box it. Since the LS14500 battery works down to -40 degrees Celsius, it will do just fine in the deep freezer.

A simple 3V testing board

I run most, if not all, of my projects on 3V because of cheap and small batteries. Both 2 x 1.5V or a small 3V coin cell. This little project was done in an hour and turned out to be quite a helper. I use mostly Arduino Pro Minis when setting up and testing circuits, but this testing board can of course be used with anything running on 3V.

X10 PIR sensor for RFXCOM transceiver

After a lot of experimentation, research and prototyping, I finally have all the parts I need to finish my PIR sensors. I plan to have one in each room, well almost.

They will have two functions. Primarily they will be used to track us and switch lights and heating (Nexa remote switches) as appropriate when we are home. The switching will follow certain rules, like time of day, who is home, weekday, weekend etc. When no one is home, they will be part of the security system and notify us, using Pushbullet, if they sense movement while we are not home. Both functions will be controlled by DomotiGa running on a Raspberry Pi, using a RFXCOM rfxtrx433e USB transceiver.

PIR sensor for Tellstick Duo

I have tried a few cheap ready made 433MHz PIR sensors bought from eBay and aliexpress, but non of them worked with my Tellstick Duo/Nexa system. I decided to make my own, and here's the result. I'm testing the prototype now, using my own API to get push notifications on my Android phone when movement is detected in my office at home. Works like a charm.

Wireless temperature sensors

This information is obsolete - New information under Multi purpose Moteino sensor

As I have several projects down the line I had to start somewhere. In this project I will build a wireless temperature sensor system. The main goal of the project is to be able to see the temperatures in several rooms at home when I'm away. I will also have a temperature node outside.

To manage this I will use Moteinos. I spent some time trying to find the best hardware for this. Before I decided I looked at XBee, JeeNode, PanStamp among others. They all have their uses, but I felt that Moteino would do the job best for this specific project. For later projects I just might try out the PanStamp as well.