Portable Bluetooth Heart Collar #nrf #bluetooth @PolarGlobal

This simple LED collar pulses to your heartbeat and is small and portable.

From the project creator Sidney San Martín:

I used a Fanstel BT832 bluetooth module with an nRF52832 microcontroller, a strip of WS2812B LEDs cut from a bigger reel, a 3V CR123A battery, and a Polar heart rate sensor strapped to my chest.

The project is powered directly from the battery. WS2812 LEDs are supposed to need a minimum of 3.3V, but I tried connecting the circuit to a power supply and slowly dropping the voltage until I stopped around 2.1V because everything was still working (just a little bit dimmer). The bluetooth module, LED strip, battery holder and some soldered wires make up the whole project. I laid it out on a few strips of Kapton tape and added a huge blob of hot glue to hold everything in place.

I only had a couple of days for the whole project and spent most of it programming, so there’s no easy way to take the collar on and off — I had a friend hot glue the other end of the strip in place while I was wearing it! Lots of room for improvement.

I programmed the project in C with the nRF5 SDK. When it powers on, it looks for Bluetooth LE heart rate sensors and connects to the first one it finds, then starts pulsing the LEDs based on the heart rate from the sensor.

Here are some delightful photos and footage of the project courtesy of Sidney:


Project code: github.com/s4y/heart_collar

Check out Sidney’s other work and drop him a line at his neat website s4y.us !

As 2022 starts, let’s take some time to share our goals for CircuitPython in 2022. Just like past years (full summary 2019, 2020, and 2021), we’d like everyone in the CircuitPython community to contribute by posting their thoughts to some public place on the Internet. Here are a few ways to post: a video on YouTub, a post on the CircuitPython forum, a blog post on your site, a series of Tweets, a Gist on GitHub. We want to hear from you. When you post, please add #CircuitPython2022 and email circuitpython2022@adafruit.com to let us know about your post so we can blog it up here.

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 code.org, 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 32,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

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 https://www.instagram.com/adafruit/

CircuitPython – The easiest way to program microcontrollers – CircuitPython.org

Maker Business — Pololu’s account of the chip shortage

Wearables — Monster-inspired costuming!

Electronics — How to make your own magnetic field probe!

Python for Microcontrollers — Python on Microcontrollers Newsletter: New Releases of MicroPython and CircuitPython and more! #Python #CircuitPython @micropython @ThePSF

Adafruit IoT Monthly — 2021 in Recap!

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! — New Products 1/21/2022 Featuring Adafruit 7-Segment LED Matrix Backpack – STEMMA QT / qwiic! (Video)

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

No Comments

No comments yet.

Sorry, the comment form is closed at this time.