Circuitera Bloghttps://circuitera.org/blogPractical Arduino concepts and browser-development explanations.enWhat Is PWM on Arduino?Understand PWM duty cycle, Uno PWM pins and analogWrite(), with an LED example and the limits of a switched output.https://circuitera.org/blog/what-is-arduino-pwmhttps://circuitera.org/blog/what-is-arduino-pwmFri, 23 Oct 2026 07:00:00 GMTdigitalRead() vs analogRead(): What’s the Difference?Choose a digital state or an ADC reading, understand Uno input limits and interpret a button and potentiometer example.https://circuitera.org/blog/digitalread-vs-analogreadhttps://circuitera.org/blog/digitalread-vs-analogreadFri, 23 Oct 2026 07:00:00 GMTWhat Does INPUT_PULLUP Mean on Arduino?Understand an active-LOW button circuit, floating inputs, internal pull-ups and the difference between a stable level and debouncing.https://circuitera.org/blog/arduino-input-pulluphttps://circuitera.org/blog/arduino-input-pullupFri, 23 Oct 2026 07:00:00 GMTHow Does millis() Work Compared With delay()?Use elapsed-time scheduling to keep an Arduino loop responsive, handle timer rollover and choose what a late task should do.https://circuitera.org/blog/arduino-millis-vs-delayhttps://circuitera.org/blog/arduino-millis-vs-delayFri, 23 Oct 2026 07:00:00 GMTWhat Is AVR-GCC and How Does Arduino Compilation Work?Follow a classic AVR sketch from C++ source to object files and Intel HEX, and understand what Circuitera Verify does—and does not—prove.https://circuitera.org/blog/what-is-avr-gcchttps://circuitera.org/blog/what-is-avr-gccFri, 23 Oct 2026 07:00:00 GMTHow Does Web Serial Let a Browser Talk to Arduino?Understand port permission, byte streams, baud rates and the difference between opening a connection and uploading firmware.https://circuitera.org/blog/web-serial-arduinohttps://circuitera.org/blog/web-serial-arduinoFri, 23 Oct 2026 07:00:00 GMTWhat Does pulseIn() Do on Arduino?Measure a complete HIGH or LOW pulse in microseconds, choose a timeout and understand why zero is not a measured distance.https://circuitera.org/blog/arduino-pulseinhttps://circuitera.org/blog/arduino-pulseinFri, 23 Oct 2026 07:00:00 GMTHow Does an HC-SR04 Ultrasonic Sensor Work?Follow Trigger, the ultrasonic burst and Echo timing; calculate distance and distinguish a missing echo from a close object.https://circuitera.org/blog/how-hc-sr04-workshttps://circuitera.org/blog/how-hc-sr04-worksFri, 23 Oct 2026 07:00:00 GMT