To add a real-time data feed to your chart:
1. Go to the spreadsheet mode (double click on any chart) and click on "Load data"
2. Choose “Connect live data”
3. Enter the URL from a Google Spreadsheet or JSON feed.
Keep in mind that the Google Spreadsheet must be published to the web (see the File menu in Google Drive). Data in the feed should be in a JSON array format with sheets as outer dimensions (having a similar structure as in Infogr.am's spreadsheets), followed by rows and columns.
4. Choose an auto-update frequency (Pro/Business/Enterprise plan feature)