SparkFun Electronics, Inc.

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SparkFun Electronics, Inc.

SparkFun provides the bits and pieces to make your electronics projects possible – we're here to help you start something.
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No matter your vision, SparkFun's products and resources are designed to make the world of electronics more accessible. In addition to over 2,000 components and widgets, SparkFun offers classes and online tutorials designed to help educate individuals in the wonderful world of embedded electronics. We're here to help you start something.

10/16/2026

Whether via zombies, meteorites, or some techno-apocalypse combo, WE ARE DOOMED!.. at some point.

Beyond food and shelter, what are you actually going to do during this (hopefully) temporary situation? For this eventuality — and your entertainment in the meantime — may we present "Portable Teensy Synth for the End of the World." This musical instrument is integrated into a hard case, and comes with built-in speakers, arcade buttons for control, a versatile USB power supply, and the ability to connect to larger systems.

Made in collaboration with Jeremy Cook, check out the full video!
https://hubs.ly/Q04BrpR30

10/15/2026

Portable DIY Teensy Synth Anyone?

Four-voice polyphony, drum samples, built-in speakers, and a 3.5mm output jack, all running on a Teensy 4.1 inside a hard case you can carry with one hand.

We teamed up with Jeremy Cook to build a portable DIY synthesizer from arcade buttons, a Teensy Audio Shield, and a Qwiic Speaker Amp. Thirteen arcade buttons give you a full C3-to-C4 keyboard with sharps and flats, two more shift octaves up or down, and four trigger drum samples. The whole system handles four notes simultaneously, so chords actually work.

The real fun is in the design decisions. Jeremy wired every button through spade connectors and screw terminals so the main board lifts right out for modifications. USB battery power keeps it portable, and the audio path splits between internal speakers and an external jack for plugging into bigger systems or recording.

The full tutorial walks through the schematic, 3D-printed supports, wiring, and the Teensy Audio library code. The link is in the first comment if you want to build your own (or adapt it into something completely different).

Learn how to make your own at https://hubs.ly/Q04Blp0L0

10/13/2026

We're going to FUSE San Francisco! Hosted by our friends at Point One Navigation, Inc., this one-day event features an incredible lineup of speakers and brings together engineers and technology leaders working on the challenges of high precision positioning with robots, autonomous vehicles, drones, or other intelligent machines.

SparkFun will be sharing a Septentrio-based high-precision GNSS kit that uses Point One correction services, demonstrating how developers can combine high-quality GNSS hardware with precision correction services to start experimenting with accurate real-world positioning. This demo will include documentation + hardware + Point One to provide RTK positioning (and we'll be giving away some kits too 😉).

Use the link on our blog to sign up - we've even got a discount code in there for 30% off your registration!

https://bit.ly/4yMwmT0

10/09/2026

We've recently released some updated current sensors with the INA228 and INA237 Qwiic Current Sensors and the ADE7953 Qwiic Non-Invasive Current Sensor and Kit.

With these releases, we realized that we have quite a few different and unique sensors that can measure and output power data, and that it could be a little confusing which sensor could be right for you. So let's go over a basic overview of what current is and the most popular SparkFun Original current sensors that we carry.

We even have a video with one of our engineers, Geoff, if you'd prefer to watch instead of reading a long form blog!

https://bit.ly/3TzGmQq

10/02/2026

70 volts measured on the PHY side of an Ethernet transformer during a hot-plug event, on a circuit rated for 3.3V.

That's what the PJRC forum found when testing passive PoE with Teensy 4.1. A 54V passive injector, an RJ45 connector whose pins don't make or break simultaneously, and parasitic capacitance in the magnetics combined to blow through the DP83825 PHY's absolute maximum MDI rating of 4V. The PHY was destroyed.

Transformer isolation protects against steady-state DC just fine. But during a fast connection transient, the system becomes electrically unbalanced, and that energy couples through. It's an analog problem hiding inside what looks like a digital interface.

This is the latest Paul's Deep Dives post, built from two PJRC forum discussions with Paul Stoffregen's original engineering insights. Read all about it at https://bit.ly/4diwW2g

09/29/2026

The MAX98357A proves that great audio performance can come in a small package. 🔊⚡
Featured in the I2S Audio Breakout, the MAX98357A combines a digital-to-analog converter (DAC) with a built-in Class D amplifier, converting I2S audio into speaker-ready output. Capable of delivering up to 3.2W into a 4Ω load, it provides a simple way to add high-quality audio to embedded projects without the need for a separate amplifier stage.
Whether you're building a smart speaker, audio notifier, interactive device, or custom IoT project, the MAX98357A helps streamline design while delivering impressive sound from a compact breakout board. SparkFun Electronics, Inc.

Explore the project👇

09/28/2026

When we talk about the Experiential Robotics Platform (XRP), much of the conversation naturally centers around middle- and high-school classrooms. But here's the thing: XRP is being adopted in colleges and universities for a variety of uses.

Some pretty interesting things are happening - from teaching advanced engineering concepts and developing new applications to running youth programs and supporting educators.

In this blog, we dive into exactly what universities are doing, looking specifically at Worcester Polytechnic Institute (WPI), Cornell Systems Engineering, ATLAS Institute at CU Boulder, Community College System of NH, and Minnesota State University, Mankato.

Learn more at https://hubs.ly/Q04yv6mc0

09/25/2026

Ready to get actual CO2 measurements (instead of estimated CO2 measurements)?

The new SparkFun STCC4/SHT40 Qwiic CO2 Sensor is a simple indoor air quality breakout that primarily measures CO2 concentration, as well as temperature and relative humidity over I2C. Specifically, the board features a pair of Sensirion sensors, isolated in their own section: the STCC4 CO2 sensor and the SHT40 digital temperature and humidity sensor. These two sensors work together to output precise and environmentally compensated CO2 readings without any complicated wiring.

While most CO2 sensors measure estimated CO2 concentration, the STCC4 uses thermal conductivity to directly measure actual CO2 concentrations from 400 to 5000 ppm (parts per million) with an accuracy of ±100ppm + 10% of the total reading. It outputs a calibrated digital signal that works with temperature and humidity data sent to it by the SHT40.

Pick one up at
https://hubs.ly/Q04ymPzR0

09/24/2026

What if you could connect an IoT device to satellites using hardware you may already have on your workbench?

Hubble Network recently opened public access to its satellite network for IoT devices, making it possible to send data through its satellite network using Bluetooth-enabled hardware. Even better, you don't necessarily need specialized satellite hardware to get started.

We made a video and guide showing you how to connect a SparkFun ESP32-C6 Thing Plus to the Hubble Network walking through the process from setup to sending data.

To celebrate their new launch, Hubble is offering a free 45-day trial for both the Terrestrial and Satellite Networks!

Learn more at https://hubs.ly/Q04ygnCx0

09/23/2026

Teaching robotics doesn't have to be difficult! With the XRP, you can progress students from Blockly to MicroPython, adding sensors and learning skills like computer vision along the way.

One robot enables years of learning!

Learn more at https://hubs.ly/Q04y8xZL0

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Niwot, CO
80503

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http://www.sparkfun.com/, https://www.sparkfun.com/affiliate-program

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