Uploaded May 2026 | Updated September 2026, 2 weeks ago
The stackup is the first decision in any PCB layout — and one of the most consequential. It determines trace impedance, return path geometry, layer assignment, and whether your high-speed signals will behave. Change it mid-layout and you restart. Get it wrong and no amount of careful routing fixes it.
This lecture builds the mental model: what a stackup is, what FR4 actually does to your signals, how ground planes control return currents, the difference between microstrip and stripline, why odd layer counts warp boards, and the five factors that determine the right layer count for a given design. It also covers the decision made in this course — why the Smart USB Thumb Drive started as a two-layer design and why it was switched to four layers.
🎓 Course: KiCad Advanced — BGA, Signal Integrity, and High-Speed Layout
Full enrollment and course details: connect.techexplorations.com/so/smart-usb-thumb-drive-with-kicad
This course takes you through the complete design of a Smart USB Thumb Drive — from schematic to manufactured PCB — using KiCad. You'll work with BGA packaging, USB differential pairs, eMMC length matching, and ideal diode power management on a real, orderable board.
In this video
A conceptual primer on PCB stackups, covering materials, layer types, transmission line geometry, and layer count selection. Impedance calculation is a separate topic covered in the next lecture — the goal here is to build the understanding that makes the maths meaningful when you get there.
Timestamps
00:00 Introduction — the stackup must be defined before a single trace is placed
01:07 What a PCB stackup is — layer sequence, types, and thickness
01:32 Core vs prepreg — materials, lamination, and why the distinction matters
02:44 FR4 dielectric properties — dielectric constant (Dk), dissipation factor (Df), and their limits
05:09 Three layer roles — signal layer, ground plane, power plane
05:51 Ground planes — return paths, impedance reference, EMI shielding, and thermal spreading
06:32 Power planes — voltage distribution and when they can serve as a secondary reference
07:23 Return current at high frequencies — path of least impedance, loop area, and why ground planes are essential
09:35 Microstrip vs stripline — outer layer vs inner layer transmission lines, trade-offs for EMI and debug access
11:43 Why stackups require even layer counts — lamination physics and board warping
13:48 Choosing layer count — signal speed, component density, power rails, EMI, and cost
16:27 The project decision — why the Smart USB Thumb Drive started as a two-layer design
17:44 Why the design switched to four layers — routing complexity and engineering trade-offs
18:32 Six rules to carry into every stackup decision
Tech Explorations creates practical electronics and PCB design courses for engineers, makers, and educators. More courses at techexplorations.com.
The stackup is the first decision in any PCB layout — and one of the most consequential. It determines trace impedance, return path geometry, layer assignment, and whether your high-speed signals will behave. Change it mid-layout and you restart. Get it wrong and no amount of careful routing fixes it.
This lecture builds the mental model: what a stackup is, what FR4 actually does to your signals, how ground planes control return currents, the difference between microstrip and stripline, why odd layer counts warp boards, and the five factors that determine the right layer count for a given design. It also covers the decision made in this course — why the Smart USB Thumb Drive started as a two-layer design and why it was switched to four layers.
🎓 Course: KiCad Advanced — BGA, Signal Integrity, and High-Speed Layout
Full enrollment and course details: connect.techexplorations.com/so/smart-usb-thumb-drive-with-kicad
This course takes you through the complete design of a Smart USB Thumb Drive — from schematic to manufactured PCB — using KiCad. You'll work with BGA packaging, USB differential pairs, eMMC length matching, and ideal diode power management on a real, orderable board.
In this video
A conceptual primer on PCB stackups, covering materials, layer types, transmission line geometry, and layer count selection. Impedance calculation is a separate topic covered in the next lecture — the goal here is to build the understanding that makes the maths meaningful when you get there.
Timestamps
00:00 Introduction — the stackup must be defined before a single trace is placed
01:07 What a PCB stackup is — layer sequence, types, and thickness
01:32 Core vs prepreg — materials, lamination, and why the distinction matters
02:44 FR4 dielectric properties — dielectric constant (Dk), dissipation factor (Df), and their limits
05:09 Three layer roles — signal layer, ground plane, power plane
05:51 Ground planes — return paths, impedance reference, EMI shielding, and thermal spreading
06:32 Power planes — voltage distribution and when they can serve as a secondary reference
07:23 Return current at high frequencies — path of least impedance, loop area, and why ground planes are essential
09:35 Microstrip vs stripline — outer layer vs inner layer transmission lines, trade-offs for EMI and debug access
11:43 Why stackups require even layer counts — lamination physics and board warping
13:48 Choosing layer count — signal speed, component density, power rails, EMI, and cost
16:27 The project decision — why the Smart USB Thumb Drive started as a two-layer design
17:44 Why the design switched to four layers — routing complexity and engineering trade-offs
18:32 Six rules to carry into every stackup decision
Tech Explorations creates practical electronics and PCB design courses for engineers, makers, and educators. More courses at techexplorations.com.
![[100] Arduino Getting Started: Introduction to conditional operators](https://i.ytimg.com/vi/N3O0KoRqMsM/mqdefault.jpg "[100] Arduino Getting Started: Introduction to conditional operators
👋 Welcome back!
This video dives into conditional operators and structures, essential tools for decision-making in Arduino programming. Understand how to use conditions to make your programs dynamic and responsive. We cover operators like equals, not equals, and greater than, along with structures like if, if-else, and else-if ladders. An example demonstrates combining conditions with logical operators. No external hardware is required, making this a great foundational tutorial for beginners.
This series is possible thanks to the kind support of Sunfounder, an online store that sells high-quality hardware and kits for Makers. Visit Sunfounder at https://sunfounder.com.
In this series, I use the SunFounder 3 in 1 Ultimate Starter Kit with Original Arduino Uno R4 Minima, including high-quality sensors, actuators, power supplies, and Original Arduino Uno R4 Minima for diverse projects and skill-building. Get it (affiliate link): https://www.sunfounder.com/collections/arduino-kits/products/sunfounder-3-in-1-ultimate-starter-kit-with-original-arduino-uno-r4-minima?ref=bXS65iah
🕒 Timestamps:
00:00 - Introduction to Conditional Operators
00:07 - Importance of Conditional Structures
00:15 - Understanding Conditional Operators
00:24 - Common Operators in Arduino C++
00:45 - Using the If Statement
00:54 - Implementing If-Else Statements
01:03 - Else-If Ladder Explained
01:09 - Combining Conditions with Logical Operators
01:19 - Practical Example: Value Between 5 and 10
01:28 - Simplicity of Examples for Easy Understanding
01:39 - Recap of Conditional Structures
01:50 - Encouragement to Experiment
01:58 - Closing Remarks
📖 What Youll Learn:
* Basic and advanced uses of conditional operators in Arduino.
* How to structure decisions within your code.
* Simple examples to practice and understand these concepts.
💡 Remember:
Experimenting with these examples will deepen your understanding of how conditional logic affects program flow.
✍️ We Want to Hear from You:
Have questions or need clarifications? Comment below!
Like this video, if it is helpful, and subscribe to stay updated with our latest tutorials.")
![[095] Arduino Getting Started: Introduction to Arrays](https://i.ytimg.com/vi/NEqNF70Bqvw/mqdefault.jpg "[095] Arduino Getting Started: Introduction to Arrays
👋 Welcome back to our Arduino series!
This video explores arrays in this tutorial. Learn the basics of array creation, initialization, and manipulation. Discover how arrays function as organized structures, like rows of mailboxes, to efficiently hold and manage multiple data points. This video covers various arrays (integer, character, and float) and demonstrates how to use them with simple examples that require no external hardware. Ideal for beginners, this session also includes a live demo showing the code in action.
This series is possible thanks to the kind support of Sunfounder, an online store that sells high-quality hardware and kits for Makers. Visit Sunfounder at https://sunfounder.com.
In this series, I use the SunFounder 3 in 1 Ultimate Starter Kit with Original Arduino Uno R4 Minima, including high-quality sensors, actuators, power supplies, and Original Arduino Uno R4 Minima for diverse projects and skill-building. Get it (affiliate link): https://www.sunfounder.com/collections/arduino-kits/products/sunfounder-3-in-1-ultimate-starter-kit-with-original-arduino-uno-r4-minima?ref=bXS65iah
🕒 Timestamps:
00:00 - Introduction to Arduino Arrays
00:02 - What are Arrays?
00:17 - Array Concept Explained
00:30 - Array Indexing in Programming
00:46 - Creating an Integer Array
01:11 - Creating a Character Array
01:23 - Creating a Float Array
01:32 - Storing Data in Arrays
01:55 - Iterating Through Arrays with Loops
02:25 - No External Hardware Required
02:37 - Live Demo: Uploading Code
03:09 - Closing Remarks & Call to Subscribe
📖 What Youll Learn:
* Basics of arrays in Arduino programming.
* How to declare, initialize, and manage data in integer, character, and float arrays.
* How to access and modify array elements.
* How to use loops for iterating through arrays.
💡 Remember:
Arrays help you manage multiple data points efficiently.
No external hardware is required for this tutorial, making it perfect for beginners.
✍️ We Want to Hear from You:
Got questions or suggestions? Comment below!
If you find this video helpful, give it a thumbs up and consider subscribing for more Arduino tutorials.
👀 See you in the next video!")
![[210] Arduino Getting Started: Ultrasonic Distance Sensor](https://i.ytimg.com/vi/NPyd5whN8XE/mqdefault.jpg "[210] Arduino Getting Started: Ultrasonic Distance Sensor
This tutorial demonstrates how to use the HCSR04 ultrasonic sensor to measure distances with an Arduino. We cover the setup, the code, and the principles behind the sensors work.
This series is possible thanks to the kind support of Sunfounder, an online store that sells high-quality hardware and kits for Makers. Visit Sunfounder at https://sunfounder.com.
In this series, I use the SunFounder 3 in 1 Ultimate Starter Kit with Original Arduino Uno R4 Minima, including high-quality sensors, actuators, power supplies, and Original Arduino Uno R4 Minima for diverse projects and skill-building. Get it (affiliate link): https://www.sunfounder.com/collections/arduino-kits/products/sunfounder-3-in-1-ultimate-starter-kit-with-original-arduino-uno-r4-minima?ref=bXS65iah
⏰ Timestamps
00:00 - 00:20: Introduction to Distance Calculation 📐
00:20 - 00:41: Printing Distance and Controlling LED 💡
00:41 - 00:53: Experiment in Action 🎬
00:53 - 01:20: Using an Oscilloscope for Visualization 📊
01:20 - 01:40: Observing Distance Changes 🔍
01:40 - 02:07: Understanding Ultrasonic Sensor Operation ⚙️
02:07 - 02:29: Distance Calculation Formula 🧮
02:29 - 02:44: Applications of Ultrasonic Sensors 🌟
02:44 - 03:01: Conclusion and Summary 🎓
03:01 - 03:15: Invitation to Subscribe 📢
📚 Main Learning Objectives
Understand how to calculate distance using an ultrasonic sensor.
Learn to set up and wire the HCSR04 ultrasonic sensor with an Arduino.
Measure and print distance values to the serial monitor.
Control an LED based on distance readings.
Use an oscilloscope to visualize the sensors output.
Comprehend the principle of echolocation used by the sensor.
Apply ultrasonic sensors in practical projects like robotics and car parking systems.
📢 Invitation to Subscribe
If you found this tutorial helpful, please give it a thumbs up 👍 and subscribe to our channel for more exciting Arduino projects. Your support motivates us to keep creating valuable content. Hit the bell icon 🔔 to stay updated with our latest tutorials. Have any questions or suggestions? Leave a comment below. Thanks for watching, and happy making! 🚀")
![[090] Arduino Getting Started: For and While loops](https://i.ytimg.com/vi/NqRX0H-9cVA/mqdefault.jpg "[090] Arduino Getting Started: For and While loops
This video series teaches how to write your first Arduino program using the Arduino Integrated Development Environment (IDE).
In this video, discover how to use loops to make your Arduino projects more dynamic and efficient. This video covers the essentials of for loops and while loops in Arduino C++. It includes their structure, applications, and practical examples to help you understand when and how to use each loop type effectively.
Remember to subscribe for more tutorials!
This series is possible thanks to the kind support of Sunfounder, an online store that sells high-quality hardware and kits for Makers. Visit Sunfounder at https://sunfounder.com.
In this series, I use the SunFounder 3 in 1 Ultimate Starter Kit with Original Arduino Uno R4 Minima, including high-quality sensors, actuators, power supplies, and Original Arduino Uno R4 Minima for diverse projects and skill-building. Get it (affiliate link): https://www.sunfounder.com/collections/arduino-kits/products/sunfounder-3-in-1-ultimate-starter-kit-with-original-arduino-uno-r4-minima?ref=bXS65iah
Timestamps:
[00:00 - 00:12] Introduction to loops in Arduino programming
[00:12 - 00:26] Explanation of for loops and their components
[00:26 - 00:42] Demonstrating a for loop example
[00:42 - 00:56] Overview of while loops and when to use them
[00:56 - 01:10] Demonstrating a while loop example
[01:10 - 01:23] Practical application: Blinking an LED with a for loop
[01:23 - 01:38] Exercise 1: Modifying the LED blink interval using a for loop
[01:38 - 01:53] Exercise 2: Using a while loop to read analog input and create an alert
[01:53 - 02:25] Conclusion and encouragement to practice and share results")
