HackSpace Magazine Issue 29 – Testing NeoPixel product voltages #NeoPixel @HackSpaceMag

The new HackSpace Magazine Issue 29 looks at testing NeoPixel (smart colored LED) voltages.

If you look at a data sheet for WS2812B RGB LEDs (commonly known as NeoPixels), you’ll see that they need an input voltage of between 3.5 V and 5.3 V, and a signal voltage of at least 0.7*input voltage. The vast majority of microcontrollers now on the market operate at 3.3V, with additional voltage outputs of 5 V and 3.3 V. This causes a problem because it means that there’s no way to connect NeoPixels directly to the microcontroller without going
out of these ranges. If you connect the NeoPixels to the 5 V power, then they need at least 3.5 V to operate, which is more than the microcontroller’s data pins output.

Of course, just because a data sheet says that they need at least 0.7*input voltage, it doesn’t mean that they do. Many people connect NeoPixels up directly to 3.3 V microcontrollers without problems. Here at HackSpace magazine, we’ve been wondering what we should advise people to do – follow the data sheet even though that leads to more complexity, or ignore the data sheet and cross our fingers as many people do. We decided to run some tests to see what the actual real-world limits are.

Read moredownload PDFbuy nowsubscribe.

See Adafruit’s entire line of 100+ NeoPixel products.

Get a free Circuit Playground Express board with a 12 month subscription: UK/Europe/Worldwide and United States.


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 35,000+ 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 — Challenges in trade between China and U.S. highlighted by forced labor bill

Wearables — There are some limits to conductive thread

Electronics — = != ==.

Python for Microcontrollers — Python on Microcontrollers Newsletter: CircuitPython 8 Beta 1, Hacktoberfest and much more! #CircuitPython @micropython @ThePSF @Raspberry_Pi

Adafruit IoT Monthly — CO2 Canary In a Coalmine, AQI Funnies, 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! — NEW PRODUCT – Adafruit ENS160 MOX Gas Sensor – Sciosense CCS811 Upgrade – STEMMA QT / Qwiic

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.