A photoelectric sensor is a module used to determine the distance, absence, or presence of an object by using a light transmitter, often infrared, and a photoelectric receiver. They are largely used in industrial manufacturing.
It consist of IR Transmitter & IR receiver. IR Transmitter emits light, in the range of Infrared frequency. IR light is invisible to us as its wavelength (700nm – 1mm) is much higher than the visible light range. on the other hand Photodiode acts as the IR receiver as its conducts when light falls on it. Photodiode is a semiconductor which has a P-N junction, operated in Reverse Bias, means it start conducting the current in reverse direction when Light falls on it, and the amount of current flow is proportional to the amount of Light. This property makes it useful for IR detection. Photodiode looks like a LED, with a black colour coating on its outer side, Black colour absorbs the highest amount of light.
TECHNICAL SPECIFICATION
Operating voltage 5v DC
I/O pins are 5V and 3.3V compliant
Range: Up to 20cm
Adjustable Sensing range
Built-in Ambient Light Sensor
20mA supply current
Mounting hole
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