The OpenGizmo Blog
Notes, experiments, and project write-ups collected while building open-source hardware and ESP32 ideas.
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How to Build a Crypto Ticker with ESP32 and MAX7219
Learn how to build a crypto ticker with an ESP32 and MAX7219 LED matrix using WiFi market data, a scrolling display loop, and a browser-based setup flow.
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How to Build a Crypto Ticker with ESP32 and MAX7219
Learn how to build a crypto ticker with an ESP32 and MAX7219 LED matrix using WiFi market data, a scrolling display loop, and a browser-based setup flow.
How to Control a Reolink NVR from an ESP32
Learn how to control a Reolink NVR from an ESP32 using WiFi, HTTPS requests, a simple local interface, and a safe state-restore workflow.
What is a Microcontroller? A Beginner's Guide
A microcontroller is a small chip that combines a CPU, memory, and programmable I/O pins, built to run firmware and control hardware directly.
Arduino IDE vs PlatformIO for ESP32
Arduino IDE is fine for a first sketch, but PlatformIO is usually the better choice for ESP32 projects: cleaner structure, pinned libraries, and real workflows.
ESP32 vs ESP8266: Which One Should You Choose?
ESP32 and ESP8266 are both cheap WiFi microcontrollers, but the ESP32 usually wins when you need more performance, Bluetooth, or more flexible hardware.
What is the ESP32? A Beginner's Guide
The ESP32 is a low-cost microcontroller from Espressif that combines WiFi, Bluetooth, GPIO, and enough processing power to build practical connected devices.
What is OpenGizmo?
OpenGizmo is an ESP32-focused site for practical open-source gadgets, build pages, and maker notes that explain how the devices actually work.