Add new Heartbeat project to learn how to use Bluetooth radio

en-GB/heartbeat/Heartbeat - notes.md

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+---
+title: Heartbeat — Notes for Club Leaders
+---
+
+#Introduction:
+In this project, children will learn how to use the Bluetooth radio in the micro:bit, by making a simple heartbeat monitor. Pressing the buttons on the micro:bit will change the image that's displayed.
+
+#Resources
+For this project, the [MakeCode (PXT)](http://jumpto.cc/pxt-new) microbit editor should be used.
+
+You can find a completed version of this project at [makecode.microbit.org/_0cT0je2sL0o7](https://makecode.microbit.org/_0cT0je2sL0o7), and the compiled .hex file can be downloaded by clicking the 'Download Project Materials' link for this project, which contains:
+
++ microbit-Heartbeat.hex
+
+#Learning Objectives
++ Radio blocks
+
+This project covers elements from the following strands of the [Raspberry Pi Digital Making Curriculum](http://rpf.io/curriculum):
+
++ [Use basic programming constructs to create simple programs.](https://www.raspberrypi.org/curriculum/programming/creator)
+
+#Challenges
++ "Fall detector" - show that multiple messages can be sent that cause different beaviours.
++ "No heartbeat detected" - extend project with features that would exist in a real device.

en-GB/heartbeat/index.md

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+---
+title: Heartbeat
+description: Send your heartbeat between two micro:bits
+layout: project
+notes: "Heartbeat - notes.md"
+new: true
+project-type: sample
+---
+
+# Introduction { .intro }
+
+In this project we need two micro:bits.
+We will use one micro:bit as a heartbeat sensor and the other one as a display.
+The two micro:bits will communicate using their radios.
+One person will pretend to be a patient connected to a heartbeat monitor.
+When they feel their heartbeat they press the A button.
+The other person can pretend to be the nurse watching see the heartbeat on their micro:bit.
+Since we're using the radios the nurse can be on the other side of the room.
+
+__Instructions__: If you're reading this online, press __A__ on the micro:bit below to send a heartbeat to a second micro:bit
+
+<div class="trinket" style="width:400px;margin: 0 auto;">
+<div style="position:relative;height:0;padding-bottom:81.97%;overflow:hidden;"><iframe style="position:absolute;top:0;left:0;width:100%;height:100%;" src="https://makecode.microbit.org/---run?id=_0cT0je2sL0o7" allowfullscreen="allowfullscreen" sandbox="allow-popups allow-scripts allow-same-origin" frameborder="0"></iframe></div>
+</div>
+
+# Step 1: Sending a message { .activity }
+
+Let's make the micro:bit send a radio message when button A is pressed.
+
+## Activity Checklist { .check }
+
++ Go to <a href="http://jumpto.cc/pxt-new" target="_blank">jumpto.cc/pxt-new</a> to start a new project in the MakeCode (PXT) editor. Call your new project 'Heartbeat'.
+
++ Delete the `forever` block, as we don't need it.
+
++ Drag a `radio set group` block (Radio section) and choose a group to belong to.
+
+![screenshot](images/heartbeat-radio-set-group.png)
+
++ Add a new `on button A pressed` event to your code.
+
+All the micro:bits in this group will talk to eachother so pick a unique number if other people are also using their micro:bit radios!
+
+![screenshot](images/heartbeat-on-button-a.png)
+
++ Drag a `radio send string` block into the `on button A pressed` block.
+
+![screenshot](images/heartbeat-radio-send-string.png)
+
++ Click 'run' to test your code. Press the 'A' button and see the antenna flash when the message is sent.
+
+![screenshot](images/heartbeat-simulate-transmit.png)
+
+# Step 2: Receiving a message { .activity }
+
+When we a micro:bit receives the 'beat message', let's show a heart symbol.
+
+## Activity Checklist { .check }
+
++ Let's add a new `on radio received` block.
+
+![screenshot](images/heartbeat-radio-received.png)
+
+This block creates a new variable 'receivedString'.
+
++ We want to check if the received message was a 'beat'. To do this drag in an `if` block.
+
+![screenshot](images/heartbeat-if.png)
+
++ Drag in a comparison block (Math section), a variable block (Variables section) and a string block (Advanced > Text section) to check the value of 'receivedString'.
+
+![screenshot](images/heartbeat-comparison.png)
+
++ Now we can add some of the blocks we've used before to flash a heart icon.
+
+![screenshot](images/heartbeat-show-icon.png)
+
++ Click 'run' to test your code. Now when you press the 'A' button a second micro:bit will show an flash a heart!
+
+![screenshot](images/heartbeat-simulate-receive.png)
+
+## Challenge: Fall detector { .challenge }
+
+Can you make the transmitting mico:bit send a different message when a shake is detected?
+Make the receiving microbit show an exclamation mark when this occurs.
+Perhaps the patient has fallen out of their bed!
+
+## Challenge: No heartbeat detected { .challenge }
+
+Can you make the receiving micro:bit show a sad face if no heartbeat is detected within 5 seconds?
+The patient needs immediate attention! (Or the sensor fell off).

en-GB/heartbeat/materials.md

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+---
+title: Heartbeat - Materials
+layout: project-materials
+project-resources:
+volunteer-resources:
+  - url: https://makecode.microbit.org/_0cT0je2sL0o7
+    type: link
+    text: https://makecode.microbit.org/_0cT0je2sL0o7
+    description: online completed project
+  - url: microbit-Heartbeat.hex
+    type: file
+    description: .hex project file to transfer onto your micro:bit
+---