KKevin Lee·13h agoWhich IoT Device SDKs Cover ESP-IDF, Arduino, STM32 and HarmonyOS? A Coverage MatrixA per-cell coverage matrix for ESP-IDF, Arduino, STM32, HarmonyOS and cloud SDKs - which layer each SDK covers and what needs verification.3 min read·thingboot.hashnode.dev
DDigiCirq·15h agoHow Does an Arduino Actually Work? From Your Sketch to One Pin Going HIGHWhat happens between digitalWrite(13, HIGH) and 5 V on a pin: the compiler, the upload, the bootloader, the ATmega328P, and the one bit in one register that does it.6 min read·digicirq.hashnode.dev
DDigiCirq·15h agoWhat Is a Decoupling Capacitor? (Values, Placement, and Why Your Chip Resets Without One)A decoupling capacitor is a tiny local battery beside a chip power pin. Why 100 nF, why it must sit close to the pin, which leg goes to ground, decoupling vs bypass.5 min read·digicirq.hashnode.dev
DDigiCirq·15h agoHow a 7-Segment Display Works: Eight LEDs, One Shared PinA 7-segment display is eight LEDs sharing one pin. Common anode vs common cathode, which segments make each digit, resistor values, and Arduino code.5 min read·digicirq.hashnode.dev
DDigiCirq·15h agoHow the 555 Timer Works: Three Resistors, Two Thirds, One CapacitorInside the 555: three resistors set 1/3 and 2/3 thresholds, two comparators watch a capacitor, a flip-flop makes it blink. Astable and monostable with formulas.4 min read·digicirq.hashnode.dev
DDigiCirq·15h agoButton Debouncing Explained: Why One Press Counts as Three (and How to Fix It)Mechanical switches bounce for a few milliseconds every press. What that looks like on a scope, and three ways to debounce: a delay, millis(), and an RC filter.4 min read·digicirq.hashnode.dev
DDigiCirq·15h agoWhat Does a Pull-Up Resistor Do? (And Why Your Button Reads Random Values Without One)A pull-up resistor gives an input pin a definite voltage when nothing drives it. Why a floating pin reads garbage, what value to use, pull-up vs pull-down.4 min read·digicirq.hashnode.dev
KKevin Lee·4d agoShipping 6,300+ 35A Smart Breakers: PCB, Firmware and Cloud LessonsWhat designing, calibrating and shipping 6,300+ mains-connected devices taught me about the parts that never show up in a feature list.6 min read·thingboot.hashnode.dev
PPRODRONE TECH Editorial Team·5d agoEdge AI on a Drone Is a Systems Problem, Not a Model ProblemExplore how latency, power, hardware limits and flight-control integration shape real-world edge AI systems on drones.5 min read·crafts.hashnode.dev
PPRODRONE TECH Editorial Team·5d agoA Camera Is Not a GPS Receiver: How Visual-Inertial Odometry Helps Drones NavigateLearn how cameras and IMUs work together in visual-inertial odometry, and where VIO helps drones navigate without reliable GNSS.5 min read·crafts.hashnode.dev1A
