Calendar datasource
To create a calendar datasource you need to create and authenticate your Google or Microsoft credential in the Wallboard system.
Google Calendar credentials:
1. Navigate to Settings > Cloud Integration > Google credentials
2. Click on the Add new and select the Calendar scope
Google calendar can be modified from content, if the Read only option is switched off.
- If you create a credential when the Read onlyis enabled, you will not be able to modify it from content.
- To change the Read onlystate, you have to create another credential, where theRead onlybutton is in the desired state.
Microsoft Calendar credentials:
1. Navigate to Settings > Cloud Integration > Microsoft credentials
2. Click on the Add new and select the Calendar scope where you can choose between SharePoint or Personal types.
After you created a calendar credential, you will not be able to modify the type, only the name of the credential.
If you wish to change the type of the credential you have to create a new with the type you need.
After you created your credential(s), you can create your calendar datasource.
Create datasource
Go to the Datasources > Click on the Add new inside the External datasource tab > Choose the Calendar type.
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Select the credential type for the calendar this could be Office365 (Microsoft) or Google. 
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For Credential, select the credentialyou created before then select your calendar.
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You have to decide how your datasource updates from the original source, either by selecting a Refresh Frequencyor by specifying aCron Expression- More about External Datasource Refreshing: External Datasource Refreshing
 
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You can randomize arrays if you enable the Randomize arraysfunction.
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If all this is done you can click on the savethen you are done!