M5Stack ITR9606 90° Infrared Reflective Sensor Unit

The ITR9606 sensor unit is designed for use with standard logic levels, typically operating within a 3.3V to 5V DC range. Always confirm the connection to the correct VCC and GND pins on the module's 3-pin header to avoid damage. The output signal will be compatible with the input logic level of your microcontroller (e.g., Arduino, ESP32, M5Stack Core).

Connect the module's VCC to 5V (or 3.3V), GND to ground, and the OUT pin to a digital input pin on your microcontroller. The output acts as a limit switch: its state changes (high/low or analog value) when an object reflects the IR beam back to the phototransistor. You can read this pin using `digitalRead()` for a threshold-based signal or `analogRead()` if connected to an ADC for reflection intensity.

This unit features a 90° detection angle, meaning it senses objects within a broad frontal cone. The effective range depends on the reflectivity of the target object and the IR emitter's power, but it is typically optimized for short-range detection (a few centimeters). For consistent operation, calibrate the detection threshold based on the specific distance and material of the objects in your application.

The ITR9606 uses modulated infrared light, which provides some immunity to ambient light interference. However, direct sunlight or very strong IR sources can saturate the phototransistor. For reliable outdoor or high-ambient-light use, consider adding a physical shield or housing to block direct light and ensure the detection is primarily from the module's own reflected IR signal.