Dev environment setup, tools, and programming guides for getting started with Arduino and robotics.
An Arduino pin can only be fully on or fully off — yet analogWrite() dims an LED smoothly from dark to blazing. Here is what PWM actually does, why only six pins can do it, and how to turn that square wave into a voltage you can measure.
How much torque does your robot actually need? It is a five-minute calculation, not a guess. Here is the math, the units that matter, and why the yellow motor in your starter kit cannot climb a ramp.
A sketch that compiles is only a sketch the compiler could parse — it says nothing about whether your logic is right. Here are the usual suspects behind a silent board, in the order worth checking them.
An Arduino sketch is just C++ with two mandatory functions. Here is what variables, loops, and functions actually do on a 2KB microcontroller — and why the type you pick matters more than you would expect.
Without an encoder, your robot is guessing how far it moved based on how long you let the motor run. Here is how quadrature encoders actually work, what PPR and CPR mean, and what to buy to start measuring instead of hoping.
Your board resets the moment a second servo moves, and the code is fine. Here is why motor current starves an Arduino, and the wiring and parts that fix it for good.
USB, barrel jack, or battery? Each one behaves differently once your project draws real current. Here is what each power path actually does, why 9V beats 12V, and why the 9V battery is the wrong answer.
Wheels, tracks, and legs each buy you something different, and each one bills you for it in battery life, code complexity, or both. Here is how to pick the right one for your robot before you spend three weeks finding out the hard way.
A dead breadboard circuit almost never means broken code or a broken part. It usually means one of six wiring assumptions quietly isn’t true. Here’s how to find which one, in the order worth checking.
Your first sensor reading isn’t magic — it’s a voltage, measured 10 bits at a time. Here’s what analogRead() actually returns, why a photoresistor is useless without a partner resistor, and how to get numbers out of the Serial Monitor that mean something.