Eye Blink Sensor 4-Channel 5V Relay Board then the Echo pin goes

then the Echo pin goes HIGH for a duration proportional to the round-trip time of the sound wave

Motion-Based Game Controller: Create a wireless tilt and gesture controller for PC or mobile games using accelerometer and gyroscope data

Lightweight & Compact: At roughly 30 g

Over-The-Air (OTA) Programming: Update your sketches wirelessly via WiFi - no USB cable needed after initial setup

Eye Blink Sensor 4-Channel 5V Relay Board then the Echo pin goesEye Blink Sensor Detect eye blinks in real time with this compact and reliable Eye Blink Sensor from The Engineer Store, Bengaluru. Designed for wearable electronics, drowsiness detection systems, and human computer interaction projects, this sensor accurately captures voluntary and involuntary eye blinks using infrared (IR) sensing technology. Ideal for biomedical engineering students, robotics enthusiasts, and safety system developers. Ships fast