Summer 2021
The problem description for the app project in the summer term 2021.
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The problem description for the app project in the summer term 2021.
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In the app project for this semester, your goal is to build and simulate a smart refrigerator (abbreviated as fridge) out of components that you learned about in the last few weeks. More precisely, your web app is going to simulate the interactive control display (ICD) of your smart fridge. In addition to the ICD, the small OLED display will be used to output the most important information to the user, in case the web app fails.
The figure below shows an example scribble of how the ICD could look as a web app. In the following, you find a list of functional requirements for the smart fridge. To complete the app project, your group must implement all requirements. You should be able to implement the requirements separately, although there are dependencies between them that require a certain order of implementation.
The smart fridge's temperature is essential to keep all food safe. Thus, the smart fridge's comes with an automatic control and warning system for the temperature:
1.1: At any time, the IDC and the OLED display should inform the user about the current temperature and the target temperature that is currently set.
1.2: On the ICD, the user should be able to set a new target temperature using an input field and a button.
1.3: On the ICD, if the current temperature differs from the target temperature by a certain threshold, the current temperature should be shown in orange (warning) and red (critical), depending on how far off the current temperature is. The regular color (e.g. black) should be used, if the value is OK. The OLED display is not affected by the thresholds.
1.4: Analogous to the previous task, the LED should blink orange and red when a threshold is exceeded. It should steadily light up in green when the temperature status is OK.
1.5: When the current temperature is critical, send a push notification to the user's smartphone and inform him/her about the current status. At the same time, the LED button should start blinking red to indicate that a user's action is necessary. When the user pushes the button, the LED button turns off again.
1.6: Make sure you send only one push notification. There should not be any further push notifications until the user pushed the LED button.
Your smart fridge keeps track of what's inside. For this, the smart fridge employs a small camera and a machine learning model trained to recognize different foods when a person holds them into the camera.
2.1: The smart fridge should be able to recognize 3 different types of foods of your choice. Train a machine learning model to recognize a food item when you hold it in front of the camera.
2.2: When the food was successfully recognized, the user can choose to press one of two buttons on the ICD. The first is labeled "Stock Item" and adds the current food item to the fridge. The second is labeled "Unstock Item" and removes the current food item from the fridge.
2.3: Make sure that both buttons are only active when the respective action can be performed. E.g. both should be inactive when no food item is recognized. The "Unstock Item" button should only be active when the current stock for the recognized food item is > 0.
2.4: A terminal should display a text message when an item was stocked or unstocked.
2.5: The smart fridge should keep stock of all food items and display the current stock in a table or some other visual format. Make sure that the smart fridge won't let the stock for a food item become negative.
2.6: When the stock level of a food item falls below 3, the smart fridge should send a push notification telling the user that is has automatically added the food item to the shopping list.
To enable or disable a button with JavaScript, you can simply set or remove the disabled attribute.
To create a column-layout as shown in the scribble above, take a look at . We are already using the Bootstrap framework in our app template, so you are ready to go.
