Prototype Photos
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usage with device tree (task 1). Graph is zoomed and dotted line shows predicted usage. |
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Viewing power |
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usage with device list (task 1). Graph is in default state, showing monthly usage. |
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Changing device settings (task 2). Dotted line shows predicted usage after saving new settings. |
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Viewing stored power with device tree (task 3). |
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Graph shows daily storage. |
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Selling power (task 3). |
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Graph shows grid pricing information. |
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Briefing
The purpose of the application is to use emerging Smart Grid technologies to help home users manage their electrical devices more efficiently – reduce energy consumption, lower cost, and make profit.
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| Round 1
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Device tree tab selected
Usage tab selected |
Figure 1.1: Daily view
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Figure 1.2: Yearly view |
In round 2 we added a "sell power" button to each device. |
Figure 2.1: Storage view
The image above shows the storage view in round 1, before the "sell power" button was added for each device in the table.
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Figure 2.2: Storage device table vs usage device table in round 2
The image above shows the device tables for "storage" (on the bottom) view and "usage" view (the top table), illustrating the similarity between the two tables.
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Transaction scheduling
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Figure 3.1: Transaction scheduling 1
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Figure 3.2 Transaction scheduling 2
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Monthly view
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Figure 4.1: Monthly view 1
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Figure 4.2: Monthly view 2
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Other
Round 1: setpoint and transaction scheduling
Round 2: new graph specific features added before round 2
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Figure 5.1.1: Setpoint
Figure 5.1.2: Scheduling transactions | 
Figure 5.2.1: Power usage estimate for today
The green dashed line in Figure 5.2.1 above, shows the estimated power usage for the next 6 hours (based on grid pricing and previous usage patterns).
Figure 5.2.2: Power usage estimate for this month
The dotted line in figure 5.2.2 shows the predicted usage values for a short period after the current time.
Figure 5.2.3: Graph average
Figure 5.2.3 above shows the horizontal dotted line with a label showing the average for the graph, as described in the "Between Round 1 and Round 2" section.
Figure 5.2.4: Graph average and power usage estimate
The images above show the graph changes we made for round 2.
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After Round 2
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- Prototype Pictures
The table below shows the changes we made based on the user feedbacks feedback in Round 2.
Changes | Round 2 | After Round 2 |
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Changed the caption and the icon of the Grid tab to Sell Power and a $ sign, so users without smart grid knowledge can still easily understand it.
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Figure 6.1.1 - The third tab at top is named Grid | 
Figure 6.1.2 - The third tab at top is renamed to Sell Power |
Renamed the Device List tab to Sort-able Device List. Hopefully this change makes the caption more descriptive to the tab’s function, and gives could give users a stronger hint on what the page will do. Also added a Select All and a Clear All checkboxes to make checking/unchecking the device checkboxes selecting and un-selecting all devices more efficient.
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Figure 6.2.1 - The second tab in the bottom pane is named Device List | 
Figure 6.2.2 - The second tab in the bottom pane is re-named Sort-able Device List. Also added Select All and Clear all checkboxes.
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Added a warning dialog if user leaves the Device Settings page without clicking the Save Settings button after he or she has made changes – we have seen users forgot to do so. No dialog will show up if user has already clicked the Save Settings button.
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Figure 6.3.1 - The Change Device Settings page. | 
Figure 6.3.2 - A warning dialog is added to warn user if he or she makes changes but forgets to click the Save Settings button before navigates to another page. |