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Michal Moskal
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# love meter blocks lesson
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create a love meter with the BBC micro:bit #pin #pressed #string #if #var #pause #show #docs
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### @video td/videos/love-meter-0
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## Topic
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On Pin Pressed
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## Quick Links
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* [activity](/microbit/lessons/love-meter/activity)
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* [quiz](/microbit/lessons/love-meter/quiz)
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* [quiz answers](/microbit/lessons/love-meter/quiz-answers)
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* [challenges](/microbit/lessons/love-meter/challenges)
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## Class
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Year 7
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## Prior learning/place of lesson in scheme of work
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Learn how to use the **pin pressed**, `on pin pressed` to run code when the user holds the GND pin with one hand, and presses pin 0 with the other hand, thus completing a circuit. We will be learning how to create a love meter using input on pin pressed, a local variable, math random, If (conditional) as well as simple commands, such as show number, pause, and show string.
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## What the teacher needs to know/QuickStart Computing Glossary
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* Hardware: The physical systems and components of digital devices; see also software.
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* Input: Data provided to a computer system, such as via a keyboard, mouse, microphone, camera or physical sensors.
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* Output: The information produced by a computer system for its user, typically on a screen, through speakers or on a printer, but possibly through the control of motors in physical systems.
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* Programmable toys: Robots designed for children to use, accepting input, storing short sequences of simple instructions and moving according to this stored program.
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* Script: A computer program typically executed one line at a time through an interpreter, such as the instructions for a Scratch character.
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* Variables: A way in which computer programs can store, retrieve or change data, such as a score, the time left, or the user’s name.
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## Documentation
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* **on pin pressed** : [read more...](/microbit/reference/input/on-pin-pressed)
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* **local variable** : [read more...](/microbit/reference/variables/var)
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* **Boolean** : [read more...](/microbit/reference/types/boolean)
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* **math random** : [read more...](/microbit/js/math)
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* **show number** : [read more...](/microbit/reference/basic/show-number)
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* **pause** : [read more...](/microbit/reference/basic/pause)
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* **If** : [read more...](/microbit/reference/logic/if)
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* **show string** : [read more...](/microbit/reference/basic/show-string)
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## Resources
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* Activity: [activity](/microbit/lessons/love-meter/activity)
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* Activity: [quiz](/microbit/lessons/love-meter/quiz)
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* Extended Activity: [challenges](/microbit/lessons/love-meter/challenges)
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## Objectives
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* learn how to run code when the user holds the GND pin in one hand, and presses pin 0 with the other hand, thus completing a circuit; when you run a script with this function in a web browser, click pin 0 on the simulator
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* learn how to a create a variable for a place where you can store and retrieve data
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* learn how Boolean operators take Boolean inputs and evaluates to a Boolean output
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* learn how to return a random number
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* learn how to show a number on the LED screen
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* learn how to pause your code for the specified number of milliseconds
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* learn how to conditionally run code depending on whether a condition is true or not
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* learn how to show a string on the LED screen one character at a time (scrolling from left to right)
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## Progression Pathways / Computational Thinking Framework
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#### Algorithms
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* Designs solutions (algorithms) that use repetition and two-way selection, ie if, then and else.(AL)
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* Uses diagrams to express solutions.(AB)
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* Uses logical reasoning to predict outputs, showing an awareness of inputs (AL)
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* Designs solutions by decomposing a problem and creates a sub-solution for each of these parts. (DE) (AL) (AB)
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* Represents solutions using a structured notation (AL) (AB)
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#### Programming & Development
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* Creates programs that implement algorithms to achieve given goals (AL)
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* Declares and assigns variables(AB)
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* Understands the difference between, and appropriately uses if and if, then and else statements(AL)
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* Uses a variable and relational operators within a loop to govern termination (AL) (GE)
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* Uses a range of operators and expressions e.g. Boolean, and applies them in the context of program control. (AL)
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* Selects the appropriate data types(AL) (AB
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#### Data & Data Representation
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* Understands the difference between data and information(AB)
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* Uses filters or can perform single criteria searches for information.(AL)
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* Performs more complex searches for information e.g. using Boolean and relational operators(AL) (GE) (EV)
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* Defines data types: real numbers and Boolean (AB)
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#### Hardware & Processing
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* Knows that computers collect data from various input devices, including sensors and application software (AB)
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* Demonstrates responsible use of technologies and online services, and knows a range of ways to report concerns Understands how search engines rank search results (AL)
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#### Information Technology
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* Collects, organizes, and presents data and information in digital content (AB)
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* Makes appropriate improvements to solutions based on feedback received, and can comment on the success of the solution (EV)
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* Makes judgements about digital content when evaluating and repurposing it for a given audience (EV) (GE)
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* Recognises ethical issues surrounding the application of information technology beyond school.
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Computational Thinking Concept: AB = Abstraction; DE = Decomposition; AL = Algorithmic Thinking; EV = Evaluation; GE = Generalisation
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## Activity
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* time: 20 min.
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* [activity](/microbit/lessons/love-meter/activity)
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* [quiz](/microbit/lessons/love-meter/quiz)
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## Extended Activity
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* time: 20 min.
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* [challenges](/microbit/lessons/love-meter/challenges)
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## Homework
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* Extended Activity: [challenges](/microbit/lessons/love-meter/challenges)
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