Step 5: Forward weather data to a dashboard

Use the sample program to collect data from a weather server and transmit the data to a dashboard server.

In this example, we will use the POU "Weather_Power_Values_EMONCMS_GET_Method". This POU contains all settings required to establish a connection with a weather server. (Depending on the HTTP server you choose, you can also use the POU "Weather_Power_Values_EMONCMS_POST_Method". Emoncms.org supports both methods.)

Prepare and compile the PLC program:

• Make sure that the POU "Weather_Power_Values_EMONCMS_GET_Method" is the only POU assigned to the program task.
• Replace the value for the parameter appid in the variable sFileOr_URL with your API key of the weather data server (registration on api.openweathermap.org required).
• Replace the value of the variable sEmoncmsAPIKey of this POU with your API key of the dashboard server (registration on emoncms.org required).

  The project is now ready to be compiled and transmitted to the PLC.

• Select Online > Online mode, then Compile all... and Download program code and PLC configuration to PLC to transmit the program to the PLC.

Start communication with the weather server and the dashboard server:

• Double-click on the variable bTrigger to turn the value of the Boolean variable to TRUE.
  First, communication with the weather server starts and weather data is received. Then the HTTP client transmits weather information to the dashboard server.
  If the communication is working properly, the weather data is displayed in your Emoncms profile and workspace. Please refer to the tutorials on the Emoncms Web site for details on how to configure your workspace.