How the kuraCloud desktop application (kCDA) interacts with other data sampling platforms

The Lt Biology and Lt Chemistry Collections were developed in partnership with Vernier, and utilize Vernier’s suite of Go Direct® Sensors. These sensors are integrated with the kuraCloud desktop application (kCDA) and are able to sample data directly into Lt.
Currently, it is not possible to sample data from the Go Direct® sensors into Graphical (GA; or Spectral Analysis, SA) if the sensor was plugged in when the kCDA was started/restarted or sampling has been attempted in Lt. This is because the kCDA is constantly scanning for Go Direct® sensors over USB and attempting to connect. The same behaviour also occurs if you try to connect Go Direct® sensors to Lt when GA already has a connection to them. Only one software application can grab ‘ahold' of a single USB connection, either GA or kCDA.
 
The kCDA does this continuous scanning and connecting so that when a student opens a lesson the sensor is already connected and ready to sample; this behavior also allows students to hotplug sensors of the same type and plug in a new sensor type without Lt (the browser) having to send down a special command to kCDA or having to refresh the webpage.
 
You may sample into GA without issue if the kCDA was started/restarted with no sensor plugged in, and Lt is closed. If you wish to sample into GA but have started/restarted the kCDA with the sensor plugged in, or have been sampling into Lt, you will need to right click on the kCDA icon in the taskbar and select 'Stop kuraCloud Desktop'. This will close any existing connections between the kCDA and the Go Direct® sensors so that you can use them with Graphical Analysis.


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Closing Graphical Analysis and selecting 'Restart kuraCloud Desktop' on the kCDA tray icon will initiate kCDA to start automatically scanning and connecting to Go Direct® sensors for Lt sampling.
Disclaimer - on “Material and set up” page
Do not open Vernier’s Graphical Analysis or Spectral Analysis when working in Lt. This will interfere with data sampling.
Disclaimer in Instructors Material
Currently, it is not possible to sample data from the Go Direct® sensors into Graphical (GA; or Spectral Analysis, SA) if the sensor was plugged in when the kCDA was started/restarted or sampling has been attempted in Lt. This is because the kCDA is constantly scanning for GoDirect sensors over USB and attempting to connect. The same behaviour also occurs if you try to connect Go Direct® sensors to Lt when GA already has a connection to them. Only one software application can grab “ahold” of a single USB connection, either GA or kCDA.
 
You may sample into GA without issue if the kCDA was started/restarted with no sensor plugged in, and Lt is closed. If you wish to sample into GA but have started/restarted the kCDA with the sensor plugged in, or have been sampling into Lt, you will need to right click on the kCDA icon in the taskbar and select 'Stop kuraCloud Desktop'. This will close any existing connections between the kCDA and the Go Direct® sensors so that you can use them with Graphical Analysis.
 
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Closing Graphical Analysis and selecting 'Restart kuraCloud Desktop' on the kCDA tray icon will initiate kCDA to start automatically scanning and connecting to Go Direct® sensors for Lt sampling.