3zuli.github.io
My projects in Embedded, IoT, Robotics and more
Project maintained by 3zuli Hosted on GitHub Pages — Theme by mattgraham
ESP8266, ESP32 and IoT projects
Neopixel glasses
2019 - present
Sunglasses with an 18 by 7 matrix of WS2812-2020 addressable LEDs.
- Powered by ESP32 with FreeRTOS
- Microphone module with MAX9814 auto-gain pre-amplifier, sampled at 40kHz by ADC using the I2S peripheral with DMA
- Real-time audio processing with FFT and beat detection. Audio processing task is pinned to the second ESP32 core.
- BMI270 6-axis IMU for motion sensing (animations can react to head movements)
- Modular system for LED effects. Currently there are 9 effects including spectrum analyzer, rainbow gradient, scrolling text, glitter, pulsing hearts and googly eyes (reacts to head movement)
- Custom LED PCB designed in KiCad
- Control unit built into a powerbank case - integrated 18650 battery holder and USB charger and it also fits into a pocket
I want to keep adding more features once events and festivals are allowed again, including a web control interface, the possibility to control the LEDs over DMX/ArtNet, and of course more LED effects and animations. I also plan to publish the code and design files on GitHub.
First test showing the LED PCB in detail
IoT CO2 and air quality sensor
2019 - present
This is a box with an MH-Z19B CO2 concentration sensor and ZH03B air particulate sensor. I use it to measure indoor air quality.
- Powered by ESP8266 D1 Mini board, programmed in Arduino IDE
- OLED screen shows current sensor readings
- Data streamed to ThingSpeak REST API over WiFi
- Hosts local web server with real-time sensor readings (websockets) and plots from ThingSpeak
IoT Pool temperature sensor
2021
Quick and dirty temperature monitor for my pool which I made in summer 2021. Uses a waterproof DS18B20 temperature sensor and an ESP8266.
- Wakes up every 5 minutes and sends data to ThingSpeak over MQTT
- Uses the ESP deep sleep mode, lasts approx. 45 days on an old 18650 battery
- Dashboard with temperature plots hosted on ThingSpeak
- Air-tight food containers can be used as good outdoor enclosures :)
Internet connection monitor
2016
This is an old project. An ESP8266 periodically checks if it’s connected to the internet and when not, it flashes a red warning strobe.