Wire a GY-521 (MPU-6050) module to Arduino to measure acceleration and rotation and infer tilt angle, with applications in robotics and drones.
Build a robot car that moves and avoids obstacles automatically using a distance sensor rotated by a servo motor and an L293D motor driver shield.
Build a soil moisture measurement system with a NodeMCU board and display the result on an LCD screen, with calibration tips for better accuracy.
A guide to wiring an RTC module over I2C to keep accurate time and date even after power is disconnected.