SWYoon Labs

Series navigation: Episode 1: The Roadmap · Episode 2: Digital Multimeter and LED Circuit · Episode 3: Voltage Divider Under Load · Episode 4: What an Oscilloscope Shows · Episode 5: How Arduino Reads Sensor Voltage · Episode 6: Why Arduino Cannot Drive a Motor Directly · Episode 7 The surprising part: The ATmega328P data sheet contains a 40 mA-per-pin number, but designing an Arduino output to operate at 40 mA is the wrong conclusion. What you will learn: How to tell a damage boundary from a usable operating specification and turn one design question into a short path through a long data sheet. What you will be able to do: Identify the exact device and package, read conditions and footnotes, and record a defensible design decision instead of copying the first number you find. AI-generated illustration of a data-sheet-reading workflow. The tables are visual placeholders, not copied specifications; use the manufacturer's current document for design values. Reader...

Series navigation: Episode 1: The Roadmap · Episode 2: Digital Multimeter and LED Circuit · Episode 3: Voltage Divider Under Load · Episode 4: What an Oscilloscope Shows · Episode 5: How Arduino Reads Sensor Voltage · Episode 6 What you will learn: Why a GPIO pin can send a command but should not supply a motor's power. What problem it solves: A motor may fail to start, reset the board, overheat an output pin, or damage the controller when connected directly. What you will be able to do: Explain a low-side N-channel MOSFET circuit, choose parts from their important ratings, and identify where motor current flows when switching on and off. AI-generated instructional image of a typical low-voltage workbench. It is not a wiring reference or a photograph of a circuit tested for this article; use the schematic below for connections. Reader guide Indicator Details Article type Power-interface concept and design checklist Reading time About 12 minutes ...

Series navigation: Episode 1: The Roadmap · Episode 2: Digital Multimeter and LED Circuit · Episode 3: Voltage Divider Under Load · Episode 4: What an Oscilloscope Shows · Episode 5 What you will learn: How a changing voltage becomes an integer inside an Arduino sketch. What problem it solves: Sensor readings often move even when the physical world appears still. What you will be able to do: Wire a potentiometer to A0, interpret a raw ADC code, estimate its input voltage, and decide whether smoothing is appropriate. AI-generated instructional image of a typical low-voltage setup. It is not a photograph of measurements performed for this article. Reader guide Indicator Details Article type Concept guide with an optional low-voltage exercise Reading time About 10 minutes Difficulty 2/5 — Beginner Hands-on time Optional; about 15 minutes Parts Arduino Uno R3 example, 10 kΩ potentiometer, breadboard, jumper wires Prerequisite Basic voltage a...

Series navigation: Episode 1: The Roadmap · Episode 2: Digital Multimeter and LED Circuit · Episode 3: Voltage Divider Under Load · Episode 4 What you will learn: How an oscilloscope turns voltage into a graph of voltage versus time. What problem it solves: A digital multimeter may show one reasonable number while hiding pulses, ripple, noise, and timing errors. What you will be able to do: Identify volts/div, time/div, trigger level, probe attenuation, frequency, period, amplitude, and duty cycle on a basic oscilloscope display. AI-generated illustration of a typical benchtop oscilloscope. It introduces the instrument and is not a photograph of a measurement performed for this article. Reader guide Indicator Details Article type Instrument orientation and waveform-reading guide Reading time About 10 minutes Difficulty 2/5 — Beginner Hands-on time Optional; about 15 minutes with an oscilloscope and its calibration output Estimated cost None t...