Aotoro CDD-40N Photoelectric Sensor 40cm Diffuse Reflective Metal Housing 12-24VDC

Light ON mode means the sensor's output is active (ON) when it detects the light beam. Dark ON mode means the output is active when the beam is interrupted (dark). The mode is selected by wiring the sensor's output pin differently, as per the datasheet, allowing you to match the logic to your control system's requirements.

With a maximum response time of 1ms, the CDD-40N can theoretically handle a switching frequency up to 1 kHz. This makes it suitable for high-speed counting applications, but actual maximum frequency may be slightly lower depending on object size, contrast, and the specific detection mode used.

Yes, the CDD-40N can be configured for detecting transparent objects, particularly when using the through-beam mode. In this setup, the transmitter and receiver are separate units. A reduction in received light intensity when a transparent object passes through the beam triggers the detection, making it effective for clear bottle or vial sensing on production lines.

The sensor's output is typically an NPN open-collector transistor. To interface with a microcontroller input pin (e.g., Arduino), connect the sensor's output wire to your digital input pin, and use a pull-up resistor (e.g., 10kΩ) to the microcontroller's logic voltage (5V or 3.3V). The sensor's common wire connects to the microcontroller's ground, ensuring a shared reference.