Arduino-Based Tilt Detector

The Arduino-Based Tilt Detector is an embedded sensing system designed to monitor angular position changes using an Arduino Uno microcontroller and an ADXL335 triple-axis accelerometer module. The ADXL335 measures static acceleration due to gravity, as well as dynamic acceleration resulting from motion, and outputs analog voltages proportional to acceleration along the X, Y, and Z axes. These analog voltage signals are fed into the analog input pins of the Arduino Uno, where the onboard analog-to-digital converter (ADC) translates the continuous voltage levels into discrete digital values that the microcontroller can process via software written in the Arduino IDE. As the physical orientation of the single-side PCB changes, the gravitational vector shifts across the accelerometer axes, causing predictable changes in the voltage readings. Based on these calculated angular thresholds, the Arduino evaluates the tilt condition and drives an output array of five LEDs to visually indicate the directional movement or degree of tilt. Connecting wires and specialized connectors ensure reliable electrical continuity between the accelerometer breakout, the microcontroller, and the indicator LEDs mounted on the custom circuit board.