RFM69

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.

Wireless Environmental Sensor

After about 100 days using the Moteino to log temperatures and humidity I have started a new project. Actually the batteries are still going after 100 days (Well, almost). The new project will again use Moteinos, but this time I will upgrade the whole thing. In addition to temperature and humidity logging, I will add a display and a barometric pressure sensor. I will write the code so it's easy to add other sensors, like rain, flood, plant humidity, light conditions etc.

Radio interference

Last night my wireless temperature sensors suddenly stopped working. Since all of them stopped at the same time, I thought it was the receiver connected to my server. Then I discovered that the Nexa remote switches didn't work either... They run on the same frequency as my temperature sensors. They worked if I held the remote very close to the receivers. That can only mean there is severe RF noise on 433MHz.

Prototypes

Wireless temperature sensors - Prototypes

Now I have a few prototypes ready and working. It took me a while. I ran into a problem when connecting a USB Moteino to my server. It works OK in Windows, but I needed it connected to the Linux running in VirtualBox. The problem is that the Moteino USB did not reveal itself as a /dev/ttyUSB0. It turned up as a /dev/ttyS0.

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This information is obsolete - New information under Multi purpose Moteino sensor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

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