Lesson 7 Cloud Mood Indicator

Transcription

1 Lesson 7 Cloud Mood Indicator What you will need CloudProfessor (CPF) RGB LED Light Arduino Leonardo Arduino Shield USB cable Overview In lesson five, students learned how to upload the value measured by the temperature sensor to the cloud storage. In this lesson, students will learn how to use the temperature data uploaded to cloud in lesson five to control and change the colour of the RGB LED light component. Learning Objectives Use cloud storage to download temperature data. Understand and use variables Understand the benefits and drawbacks of cloud storage. Learning Expectations (how learning / progress will be demonstrated) All Download temperature data taken from the CloudProfessor from cloud storage. Most Use variables in their app. Some Explain the benefits and drawbacks of cloud storage. Curriculum Links (Computing PoS) Designs simple algorithms using loops, and selection i.e. if statements. (AL) Uses logical reasoning to predict outcomes. (AL) Detects and corrects errors i.e. debugging, in algorithms. (AL) Creates programs that implement algorithms to achieve given goals. (AL) Understands that programming bridges the gap between algorithmic solutions and computers. (AB) Computational Thinking Concepts: AB = Abstraction; DE = Decomposition; AL = Algorithmic Thinking; EV = Evaluation; GE = Generalisation. Lesson 7: Cloud Mood Indicator

2 Step-by-step instructions. Connect the power of CloudProfessor then press and hold the power button for two seconds; it will turn on and the power indicator will light up.. Insert the Arduino Shield into Arduino Leonardo and use the USB cable to connect the CloudProfessor with Arduino Leonardo. Attach the RGB LED light component to port D.. When the CloudProfessor detects the Arduino Leonardo, a notification will appear on your device; click the notification to launch the Arduino Leonardo APP, and then select the CPF Arduino Blockly app. Click on Lesson Press the execute button to enter the control user interface (UI). 5. Press the edit button to enter the program editing page. Edit button Execute button CPF Arduino Blockly app Control user interface (UI) Program editing page Lesson 7: Cloud Mood Indicator

3 Exploring the code (Blockly) Let s explore the code.. Title Name Panel Set (Downloading.): The Title Name Panel Set block displays a message on the screen. In this example it will display a Downloading message to notify the user that the program is retrieving data from the cloud.. Count with:. Set aop_obj to: The count with block executes the same task repeatedly for a specified number of times. The number of times the code is repeated is specified in the to block (). In this example, the code will be repeated 0 times. The Set aop_obj to block creates a variable called aop_obj and stores the JSON object containing the data uploaded in the previous lesson. 4. Set celsius to: The Set celsius to block creates a variable called celsius and stores the contents of Value from the JSON object, which in this case contains the temperature values uploaded in lesson 5 (). 5. If/else if/else; The if/else if/else block controls the colour of the RGB LED based on the temperature value taken from the downloaded JSON object. When the temperature is less than 4 degrees, the RGB LED light will light up blue; when the temperature is between 4~8 degrees, the RGB LED light will light up green; when the temperature is between 8~ degrees, the RGB LED light will light up orange; and when the temperature is over degrees, the RGB LED light will light up red. 6. RGB LED Setting colour with: The RGB LED Setting colour with block sets the colour of the RGB LED. The RGB LED colour can be set to a pre-determined colour () or by manually inputting each of the three red, green and blue values (4) Title Name Panel Set: The Title Name Panel Set block displays a message on the screen. In this example it will display a Downloading finished message to notify the user that the program has finished retrieving data from the cloud. Try creating your own colours by mixing Red, Green and Blue (There are over ten million light colours). Try also changing the interval Delay time(sec) between each colour change. Lesson 7: Cloud Mood Indicator

4 Exploring the code (JavaScript) Let s explore the code.. ui.set( title, Downloading. ); The ui.set( title ) line displays a message on the screen. In this example it will display a Downloading message to notify the user that the program is retrieving data from the cloud.. for (index=; index<=0; index++) { The for() statement executes the same task repeatedly for a specified number of times. The number of times the code is repeated is specified in the first two sections of the for loop (). In this example, the code will be repeated 0 times.. aop.getstore(storeid); aop.getstore() downloads the data from the cloud and then converts the data into JSON format using JSON.parse(). 4. celsius = obj.temperature; celsius = obj.temperature; retrieves the temperature reading downloaded from the cloud and stores the result in a variable called celsius. ui.set("temperature sensor", celsius); reads the Celsius value and displays it on the screen (). 5. If/else if/else; The if/else if/else block controls the colour of the RGB LED based on the temperature value taken from the downloaded JSON object. When the temperature is less than 4 degrees, the RGB LED light will light up blue; when the temperature is between 4~8 degrees, the RGB LED light will light up green; when the temperature is between 8~ degrees, the RGB LED light will light up orange; and when the temperature is over degrees, the RGB LED light will light up red. 6. cpf.set("rgb led"); cpf.set("rgb led"); sets the colour of the RGB LED. The RGB LED colour is set by manually inputting each of the three red, green and blue values (). 7. ui.set("title", "Download finish"); The ui.set("title", "Download finish"); line displays a message on the screen. In this example it will display a Download finished message to notify the user that the program has finished retrieving data from the cloud. Try creating your own colours by mixing Red, Green and Blue (There are over ten million light colours). Try also changing the interval cpf.sleep(000) between each colour change. 4 Lesson 7: Cloud Mood Indicator

5 4 Extension Students to take a screenshot of their code and add comments to explain how it works. 5 Differentiation To support students, provide step by step guides. To stretch students ask them to create a flowchart / pseudocode of their code first or code their solution using JavaScript. 6 Homework Students to write up a summary of what they ve learned; students to include screenshots and snippets of their code in their summary. 7 Links Sample weather data from weather stations across the UK: How cloud storage works: Benefits of data logging: Disclaimer: Use these sites at your own risk. Acer is not responsible for the content of external Internet sites. We recommend that you check the suitability of any recommended websites links before giving them to students. 5 Lesson 7: Cloud Mood Indicator