zachwick / weathernode

ShopNet WeatherNode

The ShopNet WeatherNode monitors the ambient environment and sends data to an instance of shopnet-server. The WeatherNode monitors the following environmental parameters:

• air temperature
• barometric pressure
• relative humidity
• incident light

Configuring the WeatherNode

As with all ShopNet nodes, configuration is achieved by modifying the source code and re-flashing the node. There are a few places that need to changed in the source code on a per physical basis:

MAC Address

The MAC address of the weathernode is unique to the networking hardware and should be changed in the code to the MAC address printed (or on a sticker) of the networking hardware that you are using. In the file weathernode.ino the corresponding lines are lines 36 and 37.

byte mac[] = { 0x90, 0xA2, 0xDA, 0x0F, 0x4B, 0xD0 };
String mac_string = "90A2DA0F4BD0";

WeatherNode IP Address

If your network uses DHCP, then this part is easy because you get a network unique IP for free. If your network doesn't use DHCP, then line 42 needs to be uncommented and the values need to be set to something that makes sense for your network. The first two octets should probably remain as 192 and 168. The third octect will be the same as any other devices connected to the network; On my shop's network (see why the project is called "ShopNet"?) this third octet is 10. The fourth and final octect needs to be network unique and can be any value less than 256 (but cannot be already be on your network).

IPAddress ip(192, 168, 1, 103);

ShopNet-Server IP Address

Line 46 needs to be changed so that it has the value of the IP address at which your instance of shopnet-server is running. Alternatively, you can use the hostname of your shopnet-server instance, but I am using the IP because I am not sure that I set my shop's network up correctly.

IPAddress server(192,168,10,247);

Line 159, where the HTTP POST of the sensor data is sent to your shopnet-server instance, you must change the "HOST" line to whatever makes sense for your shopnet-server instance. You need to put in either the IP address of your shopnet-server instance, or the hostname if you used that in the previous change.

Sample Rate

The sample rate is set by using a delay at the end of the loop function. This is extremely crude and will hopefully be changed someday. In the meantime, feel free to adjust the sample time to whatever you see fit. You can sample as often as you wish, but if you sample too fast, you may run into issues with your shopnet-server not being able to respond fast enough and/or the weathernode not being able to send data quick enough.

Licenses

weathernode uses the following libraries each with their own licensing:

• HTU21D : (Beerware License)
• MPL3115A2 : (Creative Commons Share-alike 3.0

In addition to initially using the Sparkfun Weather Shield hardware, weathernode's code is derived from their Weather_Shield example code which is also licensed under the "Beerware license."

However, it is important to nodet that weathernode's code is licensed under the GNU GPLv3 or later. The full text of the license can be read in the COPYING.txt file in the weathernode source directory.