CCalcHub Tools·17h agoVoltage drop, explained with code: why your 100-foot extension run needs thicker wireOhm's law, a resistance table and one line of JavaScript explain voltage drop. Here's how to calculate it, why the 3% guideline exists, and how to pick a wire gauge for long runs.4 min read·calchubtools.hashnode.dev1
DDigiCirq·20h 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·20h agoWhat Is a Flip-Flop Circuit? SR, D, JK and T Flip-Flops ExplainedA flip-flop is one bit of memory made from two gates that feed each other. How the SR latch holds a value, what the clock adds, and what D, JK and T flip-flops do.5 min read·digicirq.hashnode.dev
DDigiCirq·20h 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·20h 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·20h 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·20h 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·20h 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
FFelipe Lodi·2d ago1-Channel (3.7-4.2V) USB Battery Power Supply with Level Display Box StationA 3.7 V LiPo box with USB-A output and a press-to-read level display, built two ways around the HW-736 solar charger. Step by step.10 min read·homebotica.hashnode.dev
SSewa TV LED Betabisnis·5d agoBagaimana Proyektor Bekerja? Memahami Teknologi Display, Pemrosesan Sinyal, dan Pembentukan GambarMemahami cara kerja proyektor melalui pemrosesan sinyal digital, sumber cahaya, teknologi DLP dan 3LCD, serta sistem optik.6 min read·sewatvledbetabisnis.hashnode.dev
