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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.

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.

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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?
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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?