--- title: "#electronics articles | Hashnode" description: "Explore 384 articles tagged #electronics on Hashnode. Tutorials, guides, and how-tos from the community." url: "https://hashnode.com/tag/electronics" --- Tag # #electronics 384 posts · 170 followers [CalcHub Tools](https://hashnode.com/@calchubtools) · [17h ago](https://hashnode.com/posts/voltage-drop-explained-with-code-why-your-100-foot-extension-run-needs-thicker-wire/6af440cf6953dab38100fc76) ### [Voltage drop, explained with code: why your 100-foot extension run needs thicker wire](https://calchubtools.hashnode.dev/voltage-drop-explained-with-code-why-your-100-foot-extension-run-needs-thicker-wire?utm_source=hashnode&utm_medium=feed) Ohm'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.dev](https://calchubtools.hashnode.dev/voltage-drop-explained-with-code-why-your-100-foot-extension-run-needs-thicker-wire?utm_source=hashnode&utm_medium=feed) [DigiCirq](https://hashnode.com/@digicirq) · [20h ago](https://hashnode.com/posts/how-does-an-arduino-actually-work-from-your-sketch-to-one-pin-going-high/6af41250ca39a8bd72dfe9ee) ### [How Does an Arduino Actually Work? From Your Sketch to One Pin Going HIGH](https://digicirq.hashnode.dev/how-does-an-arduino-actually-work-from-your-sketch-to-one-pin-going-high?utm_source=hashnode&utm_medium=feed) What 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](https://digicirq.hashnode.dev/how-does-an-arduino-actually-work-from-your-sketch-to-one-pin-going-high?utm_source=hashnode&utm_medium=feed) [DigiCirq](https://hashnode.com/@digicirq) · [20h 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) · [20h ago](https://hashnode.com/posts/what-is-a-decoupling-capacitor-values-placement-and-why-your-chip-resets-without-one/6af4111f4445d959e76ba9d1) ### [What Is a Decoupling Capacitor? (Values, Placement, and Why Your Chip Resets Without One)](https://digicirq.hashnode.dev/what-is-a-decoupling-capacitor-values-placement-and-why-your-chip-resets-without-one?utm_source=hashnode&utm_medium=feed) 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](https://digicirq.hashnode.dev/what-is-a-decoupling-capacitor-values-placement-and-why-your-chip-resets-without-one?utm_source=hashnode&utm_medium=feed) [DigiCirq](https://hashnode.com/@digicirq) · [20h 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) · [20h 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) · [20h 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) · [20h 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) [Felipe Lodi](https://hashnode.com/@f3l1p3l0d1) · [2d ago](https://hashnode.com/posts/1-channel-3-7-4-2v-usb-battery-power-supply-with-level-display-box-station/6af251734a3b350d80c33930) ### [1-Channel (3.7-4.2V) USB Battery Power Supply with Level Display Box Station](https://homebotica.hashnode.dev/1-channel-3-7-4-2v-usb-battery-power-supply-with-level-display-box-station?utm_source=hashnode&utm_medium=feed) A 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](https://homebotica.hashnode.dev/1-channel-3-7-4-2v-usb-battery-power-supply-with-level-display-box-station?utm_source=hashnode&utm_medium=feed) [Sewa TV LED Betabisnis](https://hashnode.com/@sewatvledbetabisnis) · [5d ago](https://hashnode.com/posts/cara-kerja-proyektor-teknologi-display/6aed8198f20a479c8e9aa841) ### [Bagaimana Proyektor Bekerja? Memahami Teknologi Display, Pemrosesan Sinyal, dan Pembentukan Gambar](https://sewatvledbetabisnis.hashnode.dev/cara-kerja-proyektor-teknologi-display?utm_source=hashnode&utm_medium=feed) Memahami cara kerja proyektor melalui pemrosesan sinyal digital, sumber cahaya, teknologi DLP dan 3LCD, serta sistem optik. 6 min read · [sewatvledbetabisnis.hashnode.dev](https://sewatvledbetabisnis.hashnode.dev/cara-kerja-proyektor-teknologi-display?utm_source=hashnode&utm_medium=feed)