Tag: #raspberry-pi

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• Forward Kinematics: From Joint Angles to End-Effector Position with Homogeneous Transforms and DH Parameters ♪ Listenable

  Forward kinematics is calculating where the end effector is when you know the joint angles. This post shows, with real numbers, how the 4x4 homogeneous transformation matrix resolves the mismatch between rotation (matrix

  2026-08-02 · 23 min read #robotics#math#electronics#raspberry-pi#hardware

• Inverse Kinematics: Working Backward from Where You Want to Be to the Joint Angles ♪ Listenable

  Forward kinematics is a single calculation — feed in angles, get a position. Inverse kinematics can have no solution, several solutions, or infinitely many. This post derives the analytic solution for a 2-link planar arm

  2026-08-02 · 22 min read #robotics#math#electronics#hardware#raspberry-pi

• Pull-Up, Pull-Down, and Floating Pins: Why a Single Button Is So Hard to Get Right ♪ Listenable

  Starts from why an input pin with nothing connected to it randomly flips between 0 and 1. Explains why a floating input behaves like an antenna, how pull-up and pull-down resistors solve that problem, and what the intern

  2026-07-31 · 20 min read #electronics#arduino#raspberry-pi#circuit#hardware

• 3.3V vs 5V and Level Shifting: Why Raspberry Pi GPIO Can't Survive 5V ♪ Listenable

  Wire a 5V sensor straight into a Raspberry Pi GPIO pin and the pin dies. This post starts from the definition of logic levels to explain exactly why. It covers what the VIH and VIL thresholds mean, why a 3.3V output is u

  2026-07-31 · 20 min read #electronics#raspberry-pi#arduino#hardware#iot

• LED Resistor Calculations Done Right: Why Every Color Needs a Different Value, and the E24 Series ♪ Listenable

  Starting from a diode's exponential current curve, this explains why an LED must always have a series resistor. It tables forward voltage by color, then works out real resistor values for both 5V and 3.3V supplies. It co

  2026-07-31 · 21 min read #electronics#arduino#circuit#hardware#raspberry-pi

• QuadRF and Software-Defined Radio — What "Seeing WiFi Through a Wall" Really Means

  QuadRF, featured by Jeff Geerling, is a development kit that stacks a 4×4 MIMO software-defined radio and a phased-array antenna on a Raspberry Pi 5. The provocative headline — "see WiFi through my wall" — is not X-ray v

  2026-07-11 · 6 min read #sdr#rf#radio#raspberry-pi#hardware

• The Revival of Hardware Hackathons — Making Things in an Era When Software Got Boring

  Now that AI lets anyone build a software demo, hardware hackathons are reviving as the way to stand out. We cover the argument of the viral RIP software hackathons post, a comparison of starter hardware stacks, MicroPyth

  2026-06-12 · 15 min read #hardware#hackathon#maker#raspberry-pi#esp32

• Embedded Systems & Firmware Development 2026 — STM32, ESP32-C6, RP2040, Raspberry Pi 5, Arduino, PlatformIO, Zephyr RTOS, ESP-IDF Deep Dive ♪ Listenable

  Embedded development in 2026 is no longer “the world of C and assembly only.” Dual-ISA chips like STM32, ESP32-C6 and RP2350 ship in volume, Zephyr RTOS 4.0 and FreeRTOS 11 have cemented their place as default RTOSes, an

  2026-05-16 · 22 min read #english#embedded#firmware#stm32#esp32

• The 2026 Self-Hosting Renaissance — Personal Infra Rebuilt with Tailscale, Coolify, Dokku, and a Homelab ♪ Listenable

  Early in the 2020s, everything moved to the cloud. By 2025-2026, more and more people are dragging computers back under their own desks. Tailscale gave away a working WireGuard mesh VPN for free, and the NAT-traversal ni

  2026-05-14 · 25 min read #self-hosting#homelab#tailscale#coolify#dokku

• Complete Embedded Systems & IoT Programming Guide 2025: Firmware, RTOS, Protocols

  Everything about embedded/IoT! Microcontrollers (ESP32/STM32/Arduino), RTOS (FreeRTOS/Zephyr), IoT protocols (MQTT/CoAP/LoRaWAN), sensor interfaces (I2C/SPI/UART), firmware OTA, power management, Edge AI, and security.

  2026-04-14 · 17 min read #embedded#iot#firmware#rtos#freertos

• Embedded Systems & IoT Complete Guide: From MCU to Edge AI

  A comprehensive guide to embedded systems and IoT. Covers MCU programming, RTOS, communication protocols (I2C/SPI/UART/CAN), Raspberry Pi, ESP32, and Edge AI (TFLite/ONNX) with real code examples.

  2026-03-17 · 16 min read #embedded-systems#iot#microcontroller#rtos#arduino

• Electronics for Developers — From Arduino to AI Robotics

  A guide for software developers expanding into the hardware world. From Arduino basics to sensor control, ESP32 IoT, and AI + hardware fusion projects. If you can write code, electronics is easier than you think.

  2026-03-03 · 7 min read #ai#arduino#electronics#embedded#iot

• Complete Guide to Building a Drone & Control System with Arduino + Raspberry Pi

  This post is the hub article in the embedded hands-on series. It covers the full control-system picture around an Arduino + Raspberry Pi drone build, from PID control and sensor fusion to autonomy, and points readers to

  2026-03-02 · 9 min read #ai#arduino#raspberry-pi#drone#pid-control