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docs/reference/js/lessons/strobe-light/challenges.md

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+# strobe light challenges
+
+Coding challenges for the strobe light tutorial. #docs
+
+## Before we get started
+
+Complete the following guided tutorial:
+
+* [tutorial](/microbit/lessons/strobe-light/tutorial)
+
+At the end of the tutorial, click `keep editing`. Your code should look like this:
+
+```
+for (let i = 0; i < 5; i++) {
+    for (let j = 0; j < 5; j++) {
+        led.plot(i, j)
+        basic.pause(200)
+    }
+}
+```
+
+### Challenge 1
+
+### @video td/videos/strobe-light-1
+
+Make the LEDs light up faster by changing the **pause** from 200 to 100 milliseconds:
+
+```
+for (let i1 = 0; i1 < 5; i1++) {
+    for (let j1 = 0; j1 < 5; j1++) {
+        led.plot(i1, j1)
+        basic.pause(100) // ***
+    }
+}
+```
+
+* Run the code to see if it works as expected.
+
+### Challenge 2
+
+### @video td/videos/strobe-light-2
+
+Make the board light up by rows instead of by columns by swapping the `i` and `j` variables in `led->plot(i, j)`.
+
+```
+for (let i2 = 0; i2 < 5; i2++) {
+    for (let j2 = 0; j2 < 5; j2++) {
+        led.plot(j2, i2) // ***
+        basic.pause(100)
+    }
+}
+```
+
+* Run the code to see if it works as expected.
+
+### Challenge 3
+
+### @video td/videos/strobe-light-ultimate
+
+Now that all the LEDs are lit up, let's make them turn off by reversing the strobe light pattern! You can use `led->unplot` to turn off a single LED.
+
+```
+for (let i3 = 0; i3 < 5; i3++) {
+    for (let j3 = 0; j3 < 5; j3++) {
+        led.plot(j3, i3)
+        basic.pause(100)
+    }
+}
+for (let k = 0; k < 5; k++) {
+    for (let l = 0; l < 5; l++) {
+        led.unplot(4 - l, 4 - k) // ***
+        basic.pause(100) // ***
+    }
+}
+```
+

docs/reference/js/lessons/strobe-light/lesson-plan.md

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+# strobe light lesson plan
+
+Learn how to create a blinking LED script. #LED #screen  #plot #docs
+
+## Topic
+
+For loop - Blinking LED
+
+## Class
+
+Year 7
+
+## Prior learning/place of lesson in scheme of work
+
+Learn how to control a blinking LED. We will be learning how to create a blinking app using the for loop as well as simple commands, such as plot and pause.
+
+## What the teacher needs to know
+
+**Program:** A stored set of instructions encoded in a language understood by the computer that does some form of computation, processing input and/or stored data to generate output.**
+
+**Algorithm:** An unambiguous set of rules or a precise step-by-step guide to solve a problem or achieve a particular objective. The guided tutorial follows a algorithm and is a precise step-by-step guide to solve a problem**
+
+**Loop:** A block of code repeated automatically under the program’s control. ** The blink program introduces a While Loop. While Loop is a while loop that will repeat code forever while - true.
+
+**Command:** An instruction for the computer to execute, written in a particular programming language.**
+
+**QuickStart Computing Glossary
+
+## Documentation
+
+* **plot**: [read more...](/microbit/reference/led/plot)
+* **pause**: [read more...](/microbit/reference/basic/pause)
+* **for loop**: [read more...](/microbit/reference/loops/for)
+
+## Resources
+
+* Activity: [tutorial](/microbit/lessons/strobe-light/tutorial)
+* Activity: [quiz](/microbit/lessons/strobe-light/quiz)
+* Extended Activity: [challenges](/microbit/lessons/strobe-light/challenges)
+
+## Objectives
+
+* learn how to blink a light
+* create a for loop that will loop through each x-value, y-value from 0 to 4.
+* learn how to pause the light on and off
+* learn how to repeat turning on and off the light
+
+## Links to the National Curriculum Programmes of Study for Computing
+
+## Assessment
+
+**Progression Pathways:**
+
+**Computational Thinking Framework:**
+
+#### Algorithms
+
+* Uses logical reasoning to predict outputs, showing an awareness of inputs. (AL)
+* Understands that iteration is the repetition of a process such as a loop. (AL)
+* Represents solutions using a structured notation. (AL) (AB)
+
+#### Programming & Development
+
+* Creates programs that implement algorithms to achieve given goals. (AL)
+* Uses a variable and relational operators within a loop to govern termination. (AL) (GE)
+* Uses a range of operators and expressions e.g. Boolean, and applies them in the context of program control. (AL)
+
+#### Data & Data Representation
+
+* Understands the difference between data and information. (AB)
+* Defines data types: real numbers and Boolean. (AB)
+
+#### Information Technology
+
+*  Collects, organises and presents data and information in digital content. (AB)
+* Makes appropriate improvements to solutions based on feedback received, and can comment on the success of the solution. (EV)
+
+Computational Thinking Concept: AB = Abstraction; DE = Decomposition; AL = Algorithmic Thinking; EV = Evaluation; GE = Generalisation
+
+## Activity
+
+* time: 10 min.
+* [tutorial](/microbit/lessons/strobe-light/tutorial)
+* [quiz](/microbit/lessons/strobe-light/quiz)
+* assessment opportunities: loops, plot, pause, clear screen
+
+## Extended Activity
+
+* time: 20 min.
+* [challenges](/microbit/lessons/strobe-light/challenges)
+* assessment opportunities: loops, plot, pause, clear screen
+
+## Homework
+
+* Extended Activity: [challenges](/microbit/lessons/strobe-light/challenges)
+
+## Intended follow on
+
+Publish script to the classroom.
+

docs/reference/js/lessons/strobe-light/quiz-answers.md

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+# strobe light quiz answers
+
+Learn how to create a blinking images with a for loop. #LED #screen #plot #docs
+
+This is the answer key for the [strobe light quiz](/microbit/lessons/strobe-light/quiz).
+
+## 1. What is a for loop?
+
+Answers will vary. In general, for loop refers to the code that repeats for a fixed number of times. We specify the LED using x, y coordinates.
+
+## 2. Consider the following code
+
+```
+for (let i = 0; i < 5; i++) {
+    for (let j = 0; j < 5; j++) {
+        led.plot(i, j)
+    }
+}
+```
+
+If the rectangle below represents a board that is 5 LEDs wide and 5 LEDs tall, place an X approximately where the LED is lighted. Explain why the LED is lighted there.
+
+![](/static/mb/lessons/cascade-0.png)
+
+This code turns on specific LED. Plot turns on the specified LED on the LED screen. We specify the LED using x, y coordinates. The code lights on the LEDs
+
+``x`` - the x coordinate or horizontal position (0,1,2,3,4)
+
+``y`` - the y coordinate or vertical position (0,1,2,3,4)
+
+## 3. Consider the following code
+
+```
+for (let i1 = 0; i1 < 3; i1++) {
+    for (let j1 = 0; j1 < 3; j1++) {
+        led.plot(i1, j1)
+    }
+}
+```
+
+If the rectangle below represents a board that is 5 LEDs wide and 5 LEDs tall, place an X approximately where the LED is lighted. Explain why the LED is lighted there.
+
+![](/static/mb/lessons/cascade-1.png)
+
+This code turns on specific LED. Plot turns on the specified LED on the LED screen. We specify the LED using x, y coordinates.
+
+``x`` - the x coordinate or horizontal position (0,1,2)
+
+``y`` - the y coordinate or vertical position (0,1,2)
+
+## 4. Consider the following code
+
+```
+for (let i2 = 0; i2 < 2; i2++) {
+    for (let j2 = 0; j2 < 2; j2++) {
+        led.plot(i2, j2)
+    }
+}
+```
+
+If the rectangle below represents a board that is 5 LEDs wide and 5 LEDs tall, place an X approximately where the LED is lighted. Explain why the LED is lighted there.
+
+![](/static/mb/lessons/cascade-2.png)
+
+This code turns on specific LED. Plot turns on the specified LED on the LED screen. We specify the LED using x, y coordinates.
+
+``x`` - the x coordinate or horizontal position (0,1)
+
+``y`` - the y coordinate or vertical position (0,1)
+

docs/reference/js/lessons/strobe-light/quiz.md

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+# strobe light quiz
+
+Learn how to create a blinking LED script with a for loop. #LED #screen #plot #docs
+
+## Name
+
+## Directions
+
+Use this activity document to guide your work in the [strobe light tutorial](/microbit/lessons/strobe-light/tutorial)
+
+Answer the questions while completing the tutorial. Pay attention to the dialogues!
+
+## 1. What is a for loop?
+
+## 2. Draw which LEDs are ON after running this code
+
+```
+for (let i = 0; i < 5; i++) {
+    for (let j = 0; j < 5; j++) {
+        led.plot(i, j)
+    }
+}
+```
+
+![](/static/mb/empty-microbit.png)
+
+## 3. Draw which LEDs are ON after running this code
+
+```
+for (let i1 = 0; i1 < 3; i1++) {
+    for (let j1 = 0; j1 < 3; j1++) {
+        led.plot(i1, j1)
+    }
+}
+```
+
+![](/static/mb/empty-microbit.png)
+
+## 4. Draw which LEDs are ON after running this code
+
+```
+for (let i2 = 0; i2 < 2; i2++) {
+    for (let j2 = 0; j2 < 2; j2++) {
+        led.plot(i2, j2)
+    }
+}
+```
+
+![](/static/mb/empty-microbit.png)
+