FC-03 RPM sensor module with slot optocoupler

FC-03 - module with infrared linear displacement sensor. The sensor is used in Arduino projects to determine the speed, rotational speed and count the impulses of the movements of different parts of the mechanism.

The module board is designed based on the LM393 chip and the ITR9608 slot sensor. LM393 is based on two voltage comparators. The chip is used to compare two analog signals. The salient features of the LM393 are: low current consumption (0.45mA), available in a variety of packages and a wide supply voltage range.

The ITR9608 is an optical slotted sensor into which an object is placed to read the number and frequency of rotations. An optical pair is the main element of the sensor. The ITR9608 package contains an infrared LED and a phototransistor, which are located opposite to each other. When an object appears in the gap between the elements that is capable of containing infrared radiation, the signals from the LED overlap and the transistor closes. If the transistor is closed, then the mechanical parameters are converted into digital signals at the output.

You can also determine the frequency of rotation. To do this, an object with holes is placed in the slot of the sensor, which has a cutout of 5 mm. When the disc turns, holes appear in the slot. The encoder then converts the alternations into pulses, respectively the pulses into digital signals.

The module has 4 outputs: VCC and GND, which are necessary to supply power to the module, D0 outputs digital signals, respectively, A0 is used to transmit analog signals.

There are two LEDs on the board, where one signals the power supply to the module, the other LED is on until the object is located between the phototransistor and the infrared LED.

Module Specifications:

Supply voltage, V 3.3 ... 5
Chip LM393
Encoder current consumption, mA 1.4
Clearance width, mm 5
Operating temperature, °C 0 ... 70
Mounting hole, mm 3
Module dimensions, mm 38 x 14 x 7.