An Easy Accelerometer Data Logger for Sports #Feather #Adafruit @HacksterIO

A project by dominik_hartl on places an accelerometer, a rechargeable battery and an Adafruit Feather processor with an SD card for data logging into a mint tin to provide data while doing sports.

I am a passionate mountain biker and was always wondering what are the g-forces exerted on my body during my rides. So I built a device that logs the g-forces in a.csv file on a micro SD card to analyse it after the ride.

Building the logger is rather straightforward, I wanted to fit everything in a small Altoids Gum-sized tin box, but you can use whatever you have at home.

I used a toggle switch to be able to switch the device on with gloves. As soon as the logger is switched on it starts writing, indicated by the blinking LED. Each time it is switched on it creates a new.csv file in which it writes the data where each column is one of the axis (x, y, z). I opted for a rather big battery with 600mAh so I can use it the whole day. The accelerometer has a range up to 16g, which is required as I measured impacts of 12g and more.
I used the status LED to fix the Adalogger board, this way it stays put even during the roughest of rides while still removeable to charge the device or remove the micro SD card to read the data. Generally this is a very robust device, it survived many rough rides, rain and mud so far.
You can run the device with the code on GitHub. Just upload them to your logger using the Arduino IDE. When connected to the computer, this code also writes on the serial monitor, so you can check what it is doing.

See the entire project on


Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Join 30,000+ makers on Adafruit’s Discord channels and be part of the community!

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more

CircuitPython – The easiest way to program microcontrollers –

Maker Business — Raspberry Pi (Trading) Ltd raises $45m

Wearables — A straw solution

Electronics — Optimize your op amp

Python for Microcontrollers — Python on Microcontrollers Newsletter: CircuitPython 7.0.0 Released and More! #Python #Adafruit #CircuitPython @micropython @ThePSF

Adafruit IoT Monthly — WFH Stress Monitor, Helping Parkinson's Patients with IoT, and more!

Microsoft MakeCode — MakeCode Thank You!

EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey

New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — Adafruit NeoTrellis RGB Driver PCB @adafruit @johnedgarpark #adafruit #newproductpick

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at !

No Comments

No comments yet.

Sorry, the comment form is closed at this time.