--- title: "#microcontroller articles | Hashnode" description: "Explore 79 articles tagged #microcontroller on Hashnode. Tutorials, guides, and how-tos from the community." url: "https://hashnode.com/tag/microcontroller" --- Tag # #microcontroller 79 posts · 23 followers [DigiCirq](https://hashnode.com/@digicirq) · [2d 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) [Avaq Semiconductor](https://hashnode.com/@avaq-semiconductor) · [Sep 10](https://hashnode.com/posts/how-to-choose-a-microcontroller-a-practical-guide-for-embedded-system-design/6aa257fd2c4a725bfb3a58c8) ### [How to Choose a Microcontroller: A Practical Guide for Embedded System Design](https://seminews.hashnode.dev/how-to-choose-a-microcontroller-a-practical-guide-for-embedded-system-design?utm_source=hashnode&utm_medium=feed) How to Choose a Microcontroller? The practical answer is to start with the system requirements, not with the MCU catalog. 13 min read · [seminews.hashnode.dev](https://seminews.hashnode.dev/how-to-choose-a-microcontroller-a-practical-guide-for-embedded-system-design?utm_source=hashnode&utm_medium=feed) [circuitrocks](https://hashnode.com/@circuitrocks) · [Aug 11](https://hashnode.com/posts/challenger-rp2350-nb-iot-cellular-iot-on-a-breadboard/6a7ad4f819c64657111215e5) ### [Challenger+ RP2350 NB-IoT: Cellular IoT on a Breadboard](https://circuitrocks.hashnode.dev/challenger-rp2350-nb-iot-cellular-iot-on-a-breadboard?utm_source=hashnode&utm_medium=feed) Challenger RP2350 NB-IoT Cellular: iLabs' Challenger+ RP2350 NB-IoT puts a Raspberry Pi RP2350, cellular NB-IoT, and GNSS on one Feather board that fits a… 2 min read · [circuitrocks.hashnode.dev](https://circuitrocks.hashnode.dev/challenger-rp2350-nb-iot-cellular-iot-on-a-breadboard?utm_source=hashnode&utm_medium=feed) [circuitrocks](https://hashnode.com/@circuitrocks) · [Aug 3](https://hashnode.com/posts/build-a-touchless-esp32-theremin-with-capacitive-touch-sensing/6a70145679e4c1f7dd420e45) ### [Build a Touchless ESP32 Theremin With Capacitive Touch Sensing](https://circuitrocks.hashnode.dev/build-a-touchless-esp32-theremin-with-capacitive-touch-sensing?utm_source=hashnode&utm_medium=feed) Touchless ESP32 Theremin Capacitive: An ESP32 turns hand distance into music with its capacitive touch pins and built-in DAC, no tuned oscillators or… 2 min read · [circuitrocks.hashnode.dev](https://circuitrocks.hashnode.dev/build-a-touchless-esp32-theremin-with-capacitive-touch-sensing?utm_source=hashnode&utm_medium=feed) [circuitrocks](https://hashnode.com/@circuitrocks) · [Jul 18](https://hashnode.com/posts/meet-pinch-a-32-bit-arduino-board-smaller-than-a-fingernail/6a5b42761d2c7f786066c7e9) ### [Meet Pinch: A 32-Bit Arduino Board Smaller Than a Fingernail](https://circuitrocks.hashnode.dev/meet-pinch-a-32-bit-arduino-board-smaller-than-a-fingernail?utm_source=hashnode&utm_medium=feed) Meet Pinch 32-Bit Arduino: The Moddo Pinch is a 32-bit Arduino-compatible dev board just 10.5 x 10.9 mm, packing a SAM D11, 15 GPIO pins, and an RGB LED… 2 min read · [circuitrocks.hashnode.dev](https://circuitrocks.hashnode.dev/meet-pinch-a-32-bit-arduino-board-smaller-than-a-fingernail?utm_source=hashnode&utm_medium=feed) [circuitrocks](https://hashnode.com/@circuitrocks) · [Jul 16](https://hashnode.com/posts/moonshine-micro-puts-voice-ai-on-a-sub-1-rp2350-chip/6a59561524f0680f8497d2fe) ### [Moonshine Micro Puts Voice AI on a Sub-$1 RP2350 Chip](https://circuitrocks.hashnode.dev/moonshine-micro-puts-voice-ai-on-a-sub-1-rp2350-chip?utm_source=hashnode&utm_medium=feed) Moonshine Micro Puts Voice: A new open-source toolkit squeezes voice detection, speech-to-text, and text-to-speech onto the sub-$1 RP2350, no cloud… 2 min read · [circuitrocks.hashnode.dev](https://circuitrocks.hashnode.dev/moonshine-micro-puts-voice-ai-on-a-sub-1-rp2350-chip?utm_source=hashnode&utm_medium=feed) [circuitrocks](https://hashnode.com/@circuitrocks) · [Jul 13](https://hashnode.com/posts/build-a-rotating-uv-flame-scanner-with-the-uvtron-r2868/6a54ac5d518bd7888cef64f0) ### [Build a Rotating UV Flame Scanner With the UVTRON R2868](https://circuitrocks.hashnode.dev/build-a-rotating-uv-flame-scanner-with-the-uvtron-r2868?utm_source=hashnode&utm_medium=feed) Rotating UV Flame Scanner: A solar-blind UVTRON R2868 phototube on a spinning platform spots flames through dense brush from 15 meters. 3 min read · [circuitrocks.hashnode.dev](https://circuitrocks.hashnode.dev/build-a-rotating-uv-flame-scanner-with-the-uvtron-r2868?utm_source=hashnode&utm_medium=feed) [Komal Pawar](https://hashnode.com/@komalpawar) · [Jul 12](https://hashnode.com/posts/day-1-starting-my-embedded-journey-2026-roadmap/6a534393a1f67357fe802827) ### [Day 1: Starting My Embedded Journey (2026 Roadmap)](https://komalpawar.hashnode.dev/day-1-starting-my-embedded-journey-2026-roadmap?utm_source=hashnode&utm_medium=feed) "I'm not writing because I'm an expert. I'm writing because documenting what I learn helps me learn better—and maybe it helps someone else too." Why I'm Starting This Series Instead of keeping notes 2 min read · [komalpawar.hashnode.dev](https://komalpawar.hashnode.dev/day-1-starting-my-embedded-journey-2026-roadmap?utm_source=hashnode&utm_medium=feed) [circuitrocks](https://hashnode.com/@circuitrocks) · [Jul 8](https://hashnode.com/posts/this-diy-stm32l4-smartwatch-puts-every-sensor-in-your-control/6a4ec9f6445ab34c679f0c19) ### [This DIY STM32L4 Smartwatch Puts Every Sensor in Your Control](https://circuitrocks.hashnode.dev/this-diy-stm32l4-smartwatch-puts-every-sensor-in-your-control?utm_source=hashnode&utm_medium=feed) DIY STM32L4 Smartwatch Puts: A maker built an open-source STM32L4 smartwatch with a six-axis IMU, BLE, and USB-C mass storage, then released every line of… 2 min read · [circuitrocks.hashnode.dev](https://circuitrocks.hashnode.dev/this-diy-stm32l4-smartwatch-puts-every-sensor-in-your-control?utm_source=hashnode&utm_medium=feed) [circuitrocks](https://hashnode.com/@circuitrocks) · [Jun 2](https://hashnode.com/posts/rtshield-hat-brings-real-time-rp2350-control-to-raspberry-pi/6a1e6e439f3a1d848de5eb27) ### [RTShield HAT Brings Real-Time RP2350 Control to Raspberry Pi](https://circuitrocks.hashnode.dev/rtshield-hat-brings-real-time-rp2350-control-to-raspberry-pi?utm_source=hashnode&utm_medium=feed) The RTShield HAT adds an RP2350 microcontroller to your Raspberry Pi, giving Linux projects deterministic, real-time hardware control over a UART link. 2 min read · [circuitrocks.hashnode.dev](https://circuitrocks.hashnode.dev/rtshield-hat-brings-real-time-rp2350-control-to-raspberry-pi?utm_source=hashnode&utm_medium=feed)