--- title: "#beginnersguide articles | Hashnode" description: "Explore 555 articles tagged #beginnersguide on Hashnode. Tutorials, guides, and how-tos from the community." url: "https://hashnode.com/tag/beginnersguide" --- Tag # #beginnersguide 555 posts · 28 followers [DigiCirq](https://hashnode.com/@digicirq) · [15h ago](https://hashnode.com/posts/what-is-a-flip-flop-circuit-sr-d-jk-and-t-flip-flops-explained/6af4118ac9ced2dc8a7ffff1) ### [What Is a Flip-Flop Circuit? SR, D, JK and T Flip-Flops Explained](https://digicirq.hashnode.dev/what-is-a-flip-flop-circuit-sr-d-jk-and-t-flip-flops-explained?utm_source=hashnode&utm_medium=feed) A 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](https://digicirq.hashnode.dev/what-is-a-flip-flop-circuit-sr-d-jk-and-t-flip-flops-explained?utm_source=hashnode&utm_medium=feed) [DigiCirq](https://hashnode.com/@digicirq) · [15h ago](https://hashnode.com/posts/how-a-7-segment-display-works-eight-leds-one-shared-pin/6af41017b0cf023e55cd868e) ### [How a 7-Segment Display Works: Eight LEDs, One Shared Pin](https://digicirq.hashnode.dev/how-a-7-segment-display-works-eight-leds-one-shared-pin?utm_source=hashnode&utm_medium=feed) A 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](https://digicirq.hashnode.dev/how-a-7-segment-display-works-eight-leds-one-shared-pin?utm_source=hashnode&utm_medium=feed) [DigiCirq](https://hashnode.com/@digicirq) · [15h ago](https://hashnode.com/posts/how-the-555-timer-works-three-resistors-two-thirds-one-capacitor/6af40f8d3195cb2df9c2f693) ### [How the 555 Timer Works: Three Resistors, Two Thirds, One Capacitor](https://digicirq.hashnode.dev/how-the-555-timer-works-three-resistors-two-thirds-one-capacitor?utm_source=hashnode&utm_medium=feed) Inside 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](https://digicirq.hashnode.dev/how-the-555-timer-works-three-resistors-two-thirds-one-capacitor?utm_source=hashnode&utm_medium=feed) [DigiCirq](https://hashnode.com/@digicirq) · [15h ago](https://hashnode.com/posts/button-debouncing-explained-why-one-press-counts-as-three-and-how-to-fix-it/6af40ee8ca94bb8c2ed21079) ### [Button Debouncing Explained: Why One Press Counts as Three (and How to Fix It)](https://digicirq.hashnode.dev/button-debouncing-explained-why-one-press-counts-as-three-and-how-to-fix-it?utm_source=hashnode&utm_medium=feed) 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](https://digicirq.hashnode.dev/button-debouncing-explained-why-one-press-counts-as-three-and-how-to-fix-it?utm_source=hashnode&utm_medium=feed) [DigiCirq](https://hashnode.com/@digicirq) · [15h ago](https://hashnode.com/posts/what-does-a-pull-up-resistor-do-and-why-your-button-reads-random-values-without-one/6af40e3b3c58d14c01ea3cee) ### [What Does a Pull-Up Resistor Do? (And Why Your Button Reads Random Values Without One)](https://digicirq.hashnode.dev/what-does-a-pull-up-resistor-do-and-why-your-button-reads-random-values-without-one?utm_source=hashnode&utm_medium=feed) 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](https://digicirq.hashnode.dev/what-does-a-pull-up-resistor-do-and-why-your-button-reads-random-values-without-one?utm_source=hashnode&utm_medium=feed) [Preksha barjatya](https://hashnode.com/@prekshabarjatya) · [5d ago](https://hashnode.com/posts/system-design-for-beginners-stop-coding-first/6aed50d11e33b9a48b4852b0) ### [System Design for Beginners: Stop Coding First](https://prekshabarjatya.hashnode.dev/system-design-for-beginners-stop-coding-first?utm_source=hashnode&utm_medium=feed) Learn 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.dev](https://prekshabarjatya.hashnode.dev/system-design-for-beginners-stop-coding-first?utm_source=hashnode&utm_medium=feed) [2](https://hashnode.com/posts/system-design-for-beginners-stop-coding-first/6aed50d11e33b9a48b4852b0) [CalcHub Tools](https://hashnode.com/@calchubtools) · [6d ago](https://hashnode.com/posts/why-minimum-payments-take-19-years-simulating-credit-card-payoff-in-javascript/6aec577f27cb13696c2a4a43) ### [Why minimum payments take 19 years: simulating credit card payoff in JavaScript](https://calchubtools.hashnode.dev/why-minimum-payments-take-19-years-simulating-credit-card-payoff-in-javascript?utm_source=hashnode&utm_medium=feed) A 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](https://calchubtools.hashnode.dev/why-minimum-payments-take-19-years-simulating-credit-card-payoff-in-javascript?utm_source=hashnode&utm_medium=feed) [Thới Hải Đức](https://hashnode.com/@haiduc0147) · [Nov 2](https://hashnode.com/posts/two-ways-to-solve-a-maze-the-faster-one-gives-the-worse-answer/6ae88a3b7544002e1d2ee579) ### [Two ways to solve a maze. The faster one gives the worse answer.](https://software-atlas.hashnode.dev/two-ways-to-solve-a-maze-the-faster-one-gives-the-worse-answer?utm_source=hashnode&utm_medium=feed) 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 BFS 2 min read · [software-atlas.hashnode.dev](https://software-atlas.hashnode.dev/two-ways-to-solve-a-maze-the-faster-one-gives-the-worse-answer?utm_source=hashnode&utm_medium=feed) [Aamani Nemtur](https://hashnode.com/@aamani-nemtur) · [Oct 28](https://hashnode.com/posts/learning-ai-while-working-full-time-what-actually-worked/6ae24ef97d992b0901935b1c) ### [Learning AI while working full time: what actually worked](https://aamaninemtur.com/learning-ai-while-working-full-time-what-actually-worked?utm_source=hashnode&utm_medium=feed) How 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.com](https://aamaninemtur.com/learning-ai-while-working-full-time-what-actually-worked?utm_source=hashnode&utm_medium=feed) [Subash kafle](https://hashnode.com/@subashkafle) · [Oct 29](https://hashnode.com/posts/how-to-create-a-ga4-dashboard-for-website-performance/6ae2e1bd865bda097de3e163) ### [How to Create a GA4 Dashboard for Website Performance](https://subashkafle.hashnode.dev/how-to-create-a-ga4-dashboard-for-website-performance?utm_source=hashnode&utm_medium=feed) Learn 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](https://subashkafle.hashnode.dev/how-to-create-a-ga4-dashboard-for-website-performance?utm_source=hashnode&utm_medium=feed)