Cloud computer engineer Alan regularly blogs about his Internet of Things inventions and has previously graced these pages with his Countdown-playing robot. “Building intrepid devices I can take along with me outdoors is the perfect way for me to combine my interests in one fell swoop,” he says. “I have been known to go running with 3D-printed devices attached to my legs (although understandably only at night) to gather data on my leg movement.”
Last September, Alan put his movement-sensing project to the test in a gruelling endurance race across the Brecon Beacons in Wales. He created the ‘RIoT Brick’ (Rosie Internet of Things Brick) so his family – some as far away as Australia – could remotely track his progress. Hooking himself up in this way also enabled Alan to monitor basic environmental conditions during what would be “a very, very long day!”
RIoT Brick fast facts
The rugged antenna helps the RIoT Brick communicate with other transceivers (maintaining a signal and internet connectivity proved tricky for this project)
The LCD can be used to provide GPS co‑ordinates, but was switched off to preserve battery power during the 10 Peaks Challenge. Those following Alan’s progress via the web still got detailed data!
The RIoT Brick project cost less than £50 all-in
Remote tracker data exchange was a particular challenge
There was no way to check whether the transceiver was faulty
It didn’t matter because before the race began… the aerial broke off in Alan’s car boot
The RIoT Brick is a Raspberry Pi Zero-based sensing station housed in a crudely 3D-printed box. Alan cheerfully explains that he prefers to adapt existing code and hardware, and tries to stay well away from designing and printing ‘stuff’ for his projects. In this instance, the Brick case was needed to protect the Raspberry Pi Zero and sensing modules from many miles of jostling on his 58-mile run across ten peaks.
The box houses a nRF24L01+ transceiver and u-blox NEO-6 GPS receiver, along with BME280 temperature/pressure/humidity and BH1750 light sensors. Alan credits the Raspberry Pi and Linux community for the ease with which he was able to get these devices up and running. “I chose a Raspberry Pi Zero as the central component as I needed a flexible Linux platform that was sufficiently powerful to run multiple applications concurrently,” he says.
The abundance of community-developed open-source libraries available for the modules and sensors he planned to connect to it was another big draw. He made use of an SQLite database and Python SDK Amazon Web Services. “IoT Core, IoT Events, DynamoDB, S3, Cognito, Simple Email Service, Lambda, and Elasticsearch Service are used to collect, process, and present this information back to my supposedly interested family members”, he explains.
Bricks and pieces
“During the event itself, there were several onlookers understandably baffled by the strange bright device attached to the side of my backpack,” says Alan. “A small number were even brave enough to ask! The reaction on Twitter has also been great, and I was able to raise a few pounds for Alzheimer’s Research UK as well.”