Browse blueprints
Each blueprint includes a complete bill of materials, circuit advice, and a visual build guide. Filter by category or search for a specific component.
Smart Compost Temperature Logger
DS18B20 probe + Arduino Nano logs compost pile temperature to SD card. Tells you when to turn the pile.
DIY Wind Turbine with Stepper Motor
Recycle a NEMA17 stepper motor into a 6V wind generator for a garden LED light.
ESP32 Air Quality Monitor (PM2.5 + CO2)
WiFi-connected sensor that publishes PM2.5 and eCO2 to a free MQTT dashboard.
Rainwater Level Alert with Buzzer
A simple wet-sensor that screams when your barrel is full. Uses a 555 timer, a probe, and a piezo buzzer.
Solar USB Phone Charger (5V, 1A)
A pocket-sized solar charger using a 6V monocrystalline panel, TP4056 lithium charger and an 18650 cell.
Footstep Power Generation with Piezoelectric Tiles
Convert footsteps into usable electricity using piezo discs, a bridge rectifier and a supercapacitor. A standout school science project.