ebits.dk

11/12/2025

At eBits.dk, we believe great ideas start with understanding. We’re preparing more content and tools to support your creative path.

09/12/2025

At eBits.dk, we believe innovation should be accessible to everyone — from curious beginners to advanced creators.

Whether you're learning, building, or exploring new ideas, we’re here to support your journey with knowledge, tools, and inspiration.

Let’s build the future together.

04/12/2025

eBits.dk is committed to being a place where curiosity turns into real-world skills. More exciting developments are on the way.

18/11/2025

Bluetooth started as a simple cable-replacement idea in the ’90s — today it powers everything from wearables to IoT sensors.

I just read a great deep-dive on using Bluetooth Low Energy with the CH32 series microcontrollers and the CH9141K module. It walks through wiring, USART remapping, AT-command setup, and sending real commands over a wireless serial link.

If you're building embedded or IoT projects and want an easy way to “cut the cable,” this guide is worth a look.

Read about it here:

https://ebits.dk/blogs/ebits-blogs/the-evolution-of-bluetooth-how-we-got-here

Bluetooth started in the early 1990s as a surprisingly modest idea: replace clunky serial cables. Engineers wanted a simple wireless bridge between devices, something that could stand in for RS-232 without adding complexity. What happened next was far bigger. Over the years Bluetooth gained higher d...

06/11/2025

Many assume radio is outdated, replaced by WiFi and Bluetooth.
In reality, radio is still everywhere — it just works differently now.

This video explains how digital data becomes a radio signal and how LoRa uses chirps to send information over long distances with very little power.
We’ll look at how traditional modulation like AM, FM, and FSK works, what makes LoRa’s Chirp Spread Spectrum special, and how the Meshtastic logo is actually hidden in every transmission.

Radio didn’t disappear. It adapted.

04/11/2025

Ever wished your microcontroller projects had more storage? Our new blog post shows how to easily add SPI-based storage using SD cards, SPI Flash, FRAM, or even USB drives, turning small boards into powerful data loggers.

Inspired by Curious Scientist’s guide on using FatFs with the CH32V003F4P6, we dive into how you can use the same idea to store sensor data, logs, or firmware updates in your own embedded projects.

Read the full post here: https://ebits.dk/blogs/ebits-blogs/unlocking-storage-for-your-embedded-projects

If you’ve ever wondered how to add real, expandable storage to your microcontroller projects, the article CH32V003F4P6 – SD card with FatFS is a great place to start. It shows how to connect an SD card to the CH32V003F4P6 using SPI and the FatFs filesystem, turning even a small MCU into a powerf...

30/10/2025

Why Floating Inputs Need Pull-up and Pull-down Resistors

Ever had a button or sensor act up for no reason? Chances are, the input pin was floating. In this video, I explain what a floating input actually is, why it causes random readings, and how a simple pull-up or pull-down resistor can keep your signals stable.

We’ll look at what happens when a pin isn’t tied to a defined voltage, how it picks up noise from the environment, and why that makes your microcontroller behave unpredictably. Then I’ll show how adding a resistor gives the pin a proper default state, so your inputs finally behave as they should.

If you’re building projects with Arduino, ESP32, or any IoT device, this is one of those small details that makes a big difference in reliability.

Got questions or ideas for the next video? Drop them in the comments, I love talking about practical electronics and real-world problems.

28/10/2025

Smarter Ways to Handle Buttons in Electronics Design

When your project needs more than one button, wiring can quickly get messy. Should you go for direct GPIO connections, matrix wiring, I/O expanders, or something more creative?

Our latest blog post breaks down different methods for wiring buttons in embedded projects and introduces a particularly clever approach featured by Curious Scientist: using an analog input to handle multiple buttons with just a few components.

It’s a practical look at how to keep your wiring clean, save pins, and design smarter input systems, whether you’re building a simple controller or a production-ready device.

Read the full post here: https://ebits.dk/blogs/ebits-blogs/different-ways-to-button-your-project

Every project eventually needs a way to interact, and sooner or later, that means buttons. But wiring buttons can be surprisingly tricky, especially when you want more than a couple. There are several ways to do it, each with its own strengths and limitations, depending on how many inputs you need a...

23/10/2025

On a gloomy day like this, what better way to add to the misery than not knowing which communication protocol to use? UART, SPI, or I²C — in this short video, we break down what each one actually does and when to use it.

No fluff. No metaphors. Just the facts:

UART – Simple serial connection for modules like GPS or Bluetooth.

SPI – Fast, reliable protocol for displays, SD cards, and ADCs.

I²C – Minimal wiring for multiple sensors like temperature and humidity modules.

Whether you’re working on your next IoT project or just tired of guessing which pins go where, this video gives you the clarity you need to pick the right protocol.

📦 Check out our store for IoT boards, sensors, and modules: [your store link]
🔔 Subscribe for weekly videos on electronics, IoT, and embedded systems.

16/10/2025

Meshtastic is one of the most exciting open-source communication projects out there, but even the best software is only as strong as the hardware it runs on.

In this video, I show you how to take your Meshtastic setup to the next level with better power solutions, long-lasting batteries, and optimized antennas for maximum range and reliability. Whether you’re building a node for your backpack or a remote solar-powered repeater, this guide will help you build smarter, stronger, and more efficient hardware.

What you’ll learn:

The best batteries and power options for Meshtastic nodes
How to keep your mesh alive for months with solar charging
Which antennas give the best real-world performance
Simple upgrades to make your nodes durable and weatherproof

Want the parts list and deeper build details?
Join the community on Discord

14/10/2025

Ever seen a sensor so small it makes your Arduino look oversized — yet somehow knows its exact angle within a tenth of a degree?

Yeah, that’s the AS5600 magnetic position encoder, and it’s kind of brilliant.

There’s a new post up on the blog diving into this clever little device — how it works, how it measures rotation using a diamagnetically magnetized (fancy word for “weirdly polarized”) magnet, and how it all connects neatly over I²C.

You’ll find:

What makes the AS5600 so accurate

How to mount and align it without losing your patience

How to read angles and rotations in code without the screen flickering like a haunted display

And a bit of geeky admiration for The Curious Scientist, who originally tested and explained it in detail

If you like sensors, magnets, or simply watching clever things spin perfectly in circles — this one’s for you.

https://ebits.dk/blogs/ebits-blogs/discover-precision-in-motion-the-as5600-magnetic-position-encoder

If you’ve ever tinkered with motors, robotics, or motion tracking projects, you know how crucial accurate angular feedback can be. In his latest post and video, The Curious Scientist takes you on a deep dive into one of the most impressive little sensors around: the AS5600 magnetic rotary position...

09/10/2025

MOSFET or relay? 🤔 They both switch power, but the way they do it — and when you should use each — makes a huge difference in your circuit design.

In this video, we break down:
⚡ The core differences between MOSFETs and relays
🔍 How a MOSFET works as a voltage-controlled solid-state switch
⚙️ Why relays are still great for AC isolation and high-voltage loads
🚀 Where MOSFETs shine in DC circuits, PWM, and motor control
🔥 Practical tips on choosing the right component for your next project

You’ll learn why MOSFETs are fast, efficient, and ideal for DC power electronics — while relays remain the go-to choice for rugged, isolated switching.

Whether you’re building an IoT device, motor controller, or power board, understanding these two components will make your designs safer, smarter, and more reliable.

👇 Drop a comment with what you use most in your projects — MOSFETs or relays?