Articles, guides and news about coders applying software to DIY projects.https://coderdiy.com/enhttps://coderdiy.com/en/posts/web-controlled-rgb-led-strip-esp32/https://coderdiy.com/en/posts/web-controlled-rgb-led-strip-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.Wed, 30 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/esp32-cam-live-video-stream/https://coderdiy.com/en/posts/esp32-cam-live-video-stream/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.Tue, 29 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/laser-tripwire-alarm-arduino/https://coderdiy.com/en/posts/laser-tripwire-alarm-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.Mon, 28 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/smart-trash-can-arduino/https://coderdiy.com/en/posts/smart-trash-can-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.Sun, 27 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/air-quality-monitor-esp32/https://coderdiy.com/en/posts/air-quality-monitor-esp32/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.Sat, 26 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/diy-gps-tracker-esp32/https://coderdiy.com/en/posts/diy-gps-tracker-esp32/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.Fri, 25 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/self-balancing-robot-arduino-pid/https://coderdiy.com/en/posts/self-balancing-robot-arduino-pid/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.Thu, 24 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/diy-smart-mirror-raspberry-pi/https://coderdiy.com/en/posts/diy-smart-mirror-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.Wed, 23 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/plant-timelapse-camera-raspberry-pi/https://coderdiy.com/en/posts/plant-timelapse-camera-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.Tue, 22 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/diy-macro-pad-arduino/https://coderdiy.com/en/posts/diy-macro-pad-arduino/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.Mon, 21 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/noise-level-monitor-esp32/https://coderdiy.com/en/posts/noise-level-monitor-esp32/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.Sun, 20 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/automated-pet-feeder-esp32/https://coderdiy.com/en/posts/automated-pet-feeder-esp32/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.Sat, 19 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/retro-game-console-raspberry-pi/https://coderdiy.com/en/posts/retro-game-console-raspberry-pi/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.Fri, 18 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/smart-mailbox-notifier-esp8266/https://coderdiy.com/en/posts/smart-mailbox-notifier-esp8266/A reed switch and ESP8266 deep sleep detect when mail arrives and push an instant notification, running for months on a single battery.Thu, 17 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/gesture-controlled-lamp-arduino/https://coderdiy.com/en/posts/gesture-controlled-lamp-arduino/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.Wed, 16 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/motion-triggered-wildlife-camera-raspberry-pi/https://coderdiy.com/en/posts/motion-triggered-wildlife-camera-raspberry-pi/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.Tue, 15 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/home-energy-monitor-esp32/https://coderdiy.com/en/posts/home-energy-monitor-esp32/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.Mon, 14 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/bluetooth-rc-car-arduino/https://coderdiy.com/en/posts/bluetooth-rc-car-arduino/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.Sun, 13 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/rfid-door-lock-arduino/https://coderdiy.com/en/posts/rfid-door-lock-arduino/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.Sat, 12 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/smart-doorbell-esp32-cam/https://coderdiy.com/en/posts/smart-doorbell-esp32-cam/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.Fri, 11 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/self-hosted-sensor-dashboard-grafana/https://coderdiy.com/en/posts/self-hosted-sensor-dashboard-grafana/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.Thu, 10 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/led-matrix-data-dashboard/https://coderdiy.com/en/posts/led-matrix-data-dashboard/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.Tue, 08 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/ai-3d-print-failure-detector/https://coderdiy.com/en/posts/ai-3d-print-failure-detector/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.Sun, 06 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/offline-voice-assistant-esp32/https://coderdiy.com/en/posts/offline-voice-assistant-esp32/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.Thu, 03 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/global-open-hardware-community/https://coderdiy.com/en/posts/global-open-hardware-community/From international forums to public GitHub schematics, open hardware keeps lowering the barrier between coders and DIY, no matter where you are.Wed, 02 Sep 2026 00:00:00 GMThttps://coderdiy.com/en/posts/diy-keyboard-firmware-qmk/https://coderdiy.com/en/posts/diy-keyboard-firmware-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.Sun, 30 Aug 2026 00:00:00 GMThttps://coderdiy.com/en/posts/esp32-s3-launch/https://coderdiy.com/en/posts/esp32-s3-launch/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.Fri, 28 Aug 2026 00:00:00 GMThttps://coderdiy.com/en/posts/esp32-weather-station/https://coderdiy.com/en/posts/esp32-weather-station/A walkthrough for building a compact weather station using an ESP32 and a BME280 sensor, streaming live data into Home Assistant over MQTT.Wed, 12 Aug 2026 00:00:00 GMThttps://coderdiy.com/en/posts/diy-robot-vacuum-raspberry-pi/https://coderdiy.com/en/posts/diy-robot-vacuum-raspberry-pi/Project log: using a Raspberry Pi, an ultrasonic sensor and Python to turn a basic robot chassis into a self-driving obstacle avoider.Mon, 20 Jul 2026 00:00:00 GMThttps://coderdiy.com/en/posts/smart-auto-watering-arduino/https://coderdiy.com/en/posts/smart-auto-watering-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.Fri, 05 Jun 2026 00:00:00 GMT