Blog 3 - MQTT/IFTTT

 

Blog 3 - MQTT/IFTTT



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Blog 2 - HRV Demo

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Lab 2 - Simple Heartrate Sensor Demo For the second lab, our task was to explore the capabilities of the Micro-Bit platform by connecting an external sensor to the microcontroller through its' GPIO pins. Readings were aquired through a simple serial read script created in Microsoft Makecode. In this case, the external sensor measures heart rate / pulse by shining a bright green LED light into skin tissue and measuring the light reflected back. As the heart circulates blood around the body, a small variation in pressure occurs within blood vessels, arteries and capillaries. This pressure variation can absorb more or less light at various stages of the heartbeat and is the primary mechanism of the HRV sensor. By detecting fluctuations in light reflected back from the body, it is possible to get an acurate reading on our heartbeat. A similar mechanism of measuring bloodflow is used in other 'smart' technology such as smart watches, fitness bracelets and even in professional me...
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Week 1: HRV Review

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  What is it? Heart rate variability (HRV) is the measure of the variation between heartbeats. It is controlled by your autonomic nervous system (ANS). This system operates automatically and regulate process such as the heart rate and other bodily functions that are are not under conscious control. This system is broken into two branches the flight or fight (which preparing the body for action and stress) and the rest + digest (which promotes relaxation + recovery). HRV is influenced by the ability to smoothly shift between these two branches.  High HRV: Larger difference between successive heartbeats - Indicates a more flexible and adaptable autonomic nervous system.  Low HRV: Smaller differences between successive heartbeats - Indicates a less flexible autonomic nervous system.                                                ...
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Lock In Day 1 (20/05/25)

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  Lock In day 1   Briefing We started the day with by getting the project briefing on what the end result should be. We decided to make a system where we could read in heart rates using a Microbit and then send that via the cloud to a website that would display real time data from the heart sensor.     Kanban planning Once everyone had a clear understanding of the briefing , we began defining a KanBan chart so that we could organise and allocate tasks. This consisted of Backlog, Doing, Done, Testing and Complete columns where we could quickly move tasks into different columns as they are completed.           Group allocation We began breaking down the steps required to complete this pipeline. This consisted of many different areas such as creating the cloud infrastructure on AWS, reading data on a micro bit and radio sending it to a raspberry pi so that it could be sent to the cloud infrastructure, creating a u...
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