DDigiCirq·15h 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·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
PPreksha barjatya·5d agoSystem Design for Beginners: Stop Coding FirstLearn what HLD and LLD mean, how to define requirements, and how to make trade-offs with simple real-life examples.3 min read·prekshabarjatya.hashnode.dev2AB
CCalcHub Tools·6d agoWhy minimum payments take 19 years: simulating credit card payoff in JavaScriptA month-by-month credit card simulation in about 20 lines of JavaScript, why there's no neat closed-form answer for minimum payments, and the edge cases (negative amortization, the last payment) that trip up naive code.5 min read·calchubtools.hashnode.dev
TThới Hải Đức·Nov 2Two ways to solve a maze. The faster one gives the worse answer.Same maze, two algorithms. One looked at 40 cells. The other looked at 117. You'd think the one that did less work is better. It isn't. It found a path that's 10 moves longer. BFS spreads out BFS2 min read·software-atlas.hashnode.dev
AAamani Nemtur·Oct 28Learning AI while working full time: what actually workedHow I went from AI user to builder with a full-time job: the cohort course, weekly projects, what broke, and lessons for beginners.7 min read·aamaninemtur.com3
SSubash kafle·Oct 29How to Create a GA4 Dashboard for Website PerformanceLearn how to create a GA4 dashboard step by step. Track users, sessions, engagement, traffic sources, and top pages with a simple weekly review.8 min read·subashkafle.hashnode.dev
