| Feature | Details |
| Operating Voltage | 5V DC |
| Output Type | Digital (High/Low) |
| Sensing Technology | IR Transmitter & Receiver (Reflective) |
| Mounting | Pre-mounted on Adjustable Safety Goggles |
| Indicator | Onboard LED for Blink Detection |
| Sensitivity | Potentiometer-based Adjustment |
Product Description The Eye Blink Sensor with Goggles is a specialized biometric sensor kit designed to detect the opening and closing of human eyelids in real-time. It utilizes a high-sensitivity Infrared (IR) reflective sensor positioned on a pair of safety goggles. When the eye is open, the IR light is absorbed or scattered differently than when the eyelid is closed. This change in reflected light is processed by the onboard comparator to provide a digital trigger. At Robogears, this kit is highly popular for "Drowsiness Detection Systems" in automotive safety projects and as a communication tool for patients with restricted motor skills.
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Key Highlights
Non-Invasive Monitoring: The sensor is mounted externally on goggles, meaning it does not touch the eye or interfere with the user’s vision.
Adjustable Sensitivity: Features an onboard potentiometer to calibrate the sensor according to different skin tones and distances between the eyelid and the goggles.
Real-time Feedback: Includes an onboard LED that flashes every time a blink is detected, allowing for easy testing without a microcontroller.
Standard Interface: Provides a simple 3-pin output (VCC, GND, OUT) compatible with any microcontroller like Arduino, Raspberry Pi, or ESP32.
Driver Fatigue Application: Can be programmed to trigger an alarm if the eyelids remain closed for a specific duration (indicating sleep).
Technical Specifications
Comparator IC: LM393
Cable Length: ~20cm to 30cm (from sensor to board)
Logic Level: TTL (5V)
Output State: Output goes High (or Low, depending on version) when the eye is closed.
Goggles Material: Lightweight transparent plastic.
Installation Tip from Robogears Positioning is everything for this sensor. Ensure the IR transmitter and receiver are aimed directly at the eyelid, not the pupil. When calibrating with the potentiometer, turn the screw until the onboard LED stays OFF when the eye is open and turns ON only when you blink. For drowsiness detection projects, your code should measure the "Pulse Width" of the blink; a normal blink is very fast, whereas a "drowsy" blink (eyelids closed) lasts much longer.
Note: This kit includes the Safety Goggles and the Eye Blink Sensor Module. The microcontroller is sold separately. Product images are for illustration purposes only.