Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Voltage	3.3V - 5V DC
Output Type	Digital Switching (TTL)
Sensor Type	Slotted Optical Interrupter
Slot Width	5mm
Response Time	< 10 microseconds
LED Indicator	Yes (Power and Signal)
Mounting Hole Diameter	3mm
PCB Dimensions	32mm x 14mm
Connector Type	3-Pin Header (GND, VCC, OUT)
Application	Motor Speed Testing, RPM Counting, Object Detection

6 reviews

Anonymous

Mar 21, 2026

Rating: 5/5

Reliable for production testing

We bought ten of these for our assembly line motor testing station. They have been running 8 hours a day for a month with zero failures.

Anonymous

Mar 21, 2026

Rating: 5/5

Perfect for DIY Tachometers

This module works flawlessly with my Arduino project. The signal is clean and stable even at high motor speeds. Very easy to integrate.

Anonymous

Mar 17, 2026

Rating: 4/5

Solid component

The build quality is decent for the price. The LEDs are bright enough to see status in daylight. Would recommend adding a pull-up resistor if your microcontroller doesn't have one enabled internally.

Anonymous

Mar 16, 2026

Rating: 5/5

Great for beginners

I was worried about wiring this up, but the labels on the PCB are clear. It lit up immediately and started detecting my coded wheel without issues.

Anonymous

Mar 15, 2026

Rating: 5/5

Fast response time

Used this to monitor propeller speed on a test bench. The response time is incredibly fast, capturing every pulse accurately up to 10k RPM.

Anonymous

Mar 11, 2026

Rating: 4/5

Good value, minor alignment needed

Works well for counting rotations. You need to make sure the disc passes exactly through the center of the slot, but once aligned, it is very reliable.

5 FAQ

Q: Can I use this to count water flow if I attach a spinner?

A: Yes, provided you attach a non-transparent flag or coded disk to the spinner that passes through the slot. Ensure the mechanism is sealed so water does not reach the electronic components.

Q: Does this module output analog or digital signals?

A: This is a digital switching module. It outputs a LOW signal when the slot is blocked and a HIGH signal when the slot is clear (or vice versa depending on logic configuration).

Q: What is the maximum width of the object that can pass through the slot?

A: The slotted optocoupler has a gap width of approximately 5mm. Any opaque object thinner than 5mm can interrupt the beam effectively.

Q: Is there a way to adjust the sensitivity of the sensor?

A: No, this specific model does not have a potentiometer for sensitivity adjustment. It is calibrated at the factory for standard object detection tasks.

Q: Can this sensor work with a 3.3V microcontroller like ESP32?

A: Yes, this module supports a wide voltage range from 3.3V to 5V, making it fully compatible with ESP32, ESP8266, and standard 5V Arduinos.

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