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Web-Controlled RGB LED Strip with ESP32
Have an ESP32 host its own color-picker web page for a WS2812/NeoPixel strip — no app, no cloud account, just open a browser on the local network.
Live Video Streaming to a Browser with ESP32-CAM
Stream live MJPEG video straight from an ESP32-CAM to any browser on the local network, viewable from a phone or laptop with zero apps — with the core streaming handler code.
Laser Tripwire Security Alarm with Arduino
Build a movie-style laser tripwire with a laser module and an LDR light sensor — with automatic baseline calibration on boot and debouncing to kill false alarms.
Touch-Free Smart Trash Can with Arduino
Use an HC-SR04 ultrasonic sensor to detect an approaching hand and a servo to auto-open the lid — touch-free, with a state machine that keeps the servo from jittering.
Air Quality Monitor with ESP32 and a PMS5003 Sensor
Read PM2.5/PM10 fine dust levels with the PMS5003 laser sensor, parse its binary UART frame, and alert when air quality crosses a safe threshold — with full frame-parsing code.
Build a DIY GPS Tracker with an ESP32 and a NEO-6M Module
Read and parse NMEA data from a NEO-6M GPS module using an ESP32 and the TinyGPS++ library, log coordinates over time, and serve the last known position from a small self-hosted web page.
Build a Self-Balancing Two-Wheel Robot with Arduino and PID Control
Build an inverted-pendulum two-wheel robot using Arduino, an MPU6050, and a PID control loop to keep itself upright — P, I, D explained plainly, with working code and real tuning advice.
Build a DIY Smart Mirror with a Raspberry Pi
Combine a Raspberry Pi, an old monitor panel, and two-way acrylic mirror film into a smart mirror that shows the time and weather right on its surface — with kiosk-mode setup and a weather widget.
Build a Plant Growth Time-Lapse Camera with a Raspberry Pi
Use a Raspberry Pi and a Pi Camera to photograph a plant every 10 minutes for weeks, then stitch the frames into a time-lapse video with ffmpeg — with a working capture script and the exact ffmpeg command.
Build a DIY Macro Pad with an Arduino Pro Micro
Turn a handful of switches and a Pro Micro board into a real USB macro keyboard that fires custom shortcuts with one press — full code and debounce tips included.
Relative Noise Level Monitor with ESP32 and a Built-In Web Dashboard
Sample sound amplitude with a mic sensor, compute a relative noise level in real time, and watch a live chart served directly from the ESP32 itself.
Automated Pet Feeder with ESP32, a Servo, and an RTC Module
Feed on schedule using an RTC module that doesn't depend on WiFi, plus a browser button on your phone for an extra feeding anytime.
Build a Retro Game Console with Raspberry Pi, RetroPie, and a GPIO Controller
Wire real arcade-style buttons and a joystick directly to Raspberry Pi GPIO pins and read them with a Python daemon so RetroPie sees them as keyboard input.
Smart Mailbox Notifier: Get Alerted the Moment Mail Arrives with an ESP8266
A reed switch and ESP8266 deep sleep detect when mail arrives and push an instant notification, running for months on a single battery.
Gesture-Controlled Lamp with Arduino and the APDS-9960
Wave your hand up, down, left, or right to toggle and dim a lamp — no touching required, using an APDS-9960 gesture sensor and a PWM-driven MOSFET.
Motion-triggered wildlife camera with Raspberry Pi and a PIR sensor
Use a Raspberry Pi, Pi Camera, and PIR sensor to automatically snap photos or clips whenever a bird or animal visits your garden — with Python code using picamera2 and cooldown logic to avoid a flood of files.
Home energy monitoring with ESP32 and a non-invasive current sensor
Measure an appliance's power draw with a non-invasive SCT-013 current clamp and an ESP32, publishing readings over MQTT — with an important safety note about working near mains wiring.
Bluetooth-controlled RC car with Arduino and L298N
Build a phone-controlled RC car using an HC-05 Bluetooth module, Arduino, and an L298N H-bridge — with a simple command protocol and PWM speed control code.
RFID door lock with Arduino and RC522: unlock only for the right card
Build a card-based door lock with Arduino, an RC522 reader, and a servo — including how to read a card's UID, maintain an allow-list, and full working code.
Smart doorbell with ESP32-CAM: snap a photo and send it to Telegram
Use a PIR sensor and an ESP32-CAM to detect motion at the door, snap a photo automatically, and push it straight to Telegram — with sample code and the classic GPIO0 gotcha.
A Self-Hosted Dashboard for DIY Sensor Data with Grafana and InfluxDB
Pull data from every ESP32/Arduino board you've ever built into one dashboard, self-hosted at home with InfluxDB and Grafana, with no dependency on any cloud service.
A Real-Time LED Matrix Data Dashboard with ESP32 and WS2812
Turn a WS2812 LED matrix into a tiny display for weather, coin prices, or unread notification counts — updated continuously over an API, no LCD required.
Building an AI Camera That Catches 3D Print Failures with Raspberry Pi and OpenCV
Use a webcam, a Raspberry Pi and a bit of image processing to automatically detect 'spaghetti' or warping mid-print, then auto-pause the printer through OctoPrint.
Building an Offline Voice Assistant with ESP32 and Keyword Spotting
No audio sent to the cloud: use an ESP32-S3 and a tiny keyword-spotting model to trigger a device by voice, running entirely on-device.
The Global Open-Hardware Community Is Making DIY More Accessible Than Ever
From international forums to public GitHub schematics, open hardware keeps lowering the barrier between coders and DIY, no matter where you are.
Programming Firmware for a Custom Mechanical Keyboard with QMK
From a hand-soldered keyboard frame to an input device with its own logic: use QMK to program layers, macros and shortcuts for your DIY keyboard.
Why the ESP32-S3 Is Becoming the Default Choice for DIY Projects
A look at why the ESP32-S3 microcontroller line keeps showing up in maker projects: simpler on-device AI, more GPIO pins, and native USB support.
Build a Mini Weather Station with ESP32 and Home Assistant
A walkthrough for building a compact weather station using an ESP32 and a BME280 sensor, streaming live data into Home Assistant over MQTT.
Building an Obstacle-Avoiding Robot with Raspberry Pi and Python
Project log: using a Raspberry Pi, an ultrasonic sensor and Python to turn a basic robot chassis into a self-driving obstacle avoider.
A Smart Auto-Watering System with Arduino
Use a soil moisture sensor, an Arduino and a relay to water your plants exactly when they need it — sample code and tips for avoiding fried relays and dead sensors.