Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Sensor Type | Through-Beam Photoelectric |
| Detection Method | Infrared Slot Photocoupler |
| Operating Voltage | 3.3V - 5V DC |
| Output Signal | Digital TTL Level |
| Slot Width | 5mm |
| Response Time | < 10 microseconds |
| Max Counting Frequency | 20 kHz |
| LED Indicator | Yes (Power and Signal) |
| Mounting Hole Distance | 14mm |
| Application | Smart Car Speed Measurement & Motor Encoder |
Anonymous
Mar 28, 2026
Rating: 4/5
Good value, precise detection
I bought two of these for a differential drive robot. The infrared beam is strong and the slot size is perfect for standard encoder disks. One star off because the mounting holes are slightly tight, but overall great quality.
Anonymous
Mar 16, 2026
Rating: 4/5
Works as described
The sensor detects interruptions in the beam instantly. I used it to measure the RPM of a DC motor and the data was consistent. Just ensure your power supply is stable for best results.
Anonymous
Mar 16, 2026
Rating: 5/5
Perfect for my robotics project
This sensor works flawlessly with my Arduino-based smart car. The response time is incredibly fast, allowing for accurate speed calculations even at high motor RPMs. Easy to wire and very stable.
Anonymous
Mar 15, 2026
Rating: 5/5
Essential for motor control
Using this as an encoder counter for a PID control loop. It provides clean digital signals without any noticeable jitter. Highly recommended for university projects or DIY automation.
Anonymous
Mar 07, 2026
Rating: 5/5
Reliable and compact
We use these in our workshop for various conveyor belt speed monitoring tasks. They are small, durable, and the LED indicators make troubleshooting very easy. No false triggers so far.
Anonymous
Mar 04, 2026
Rating: 5/5
Excellent precision
Better than expected for the price. The through-beam design ensures that dust or ambient light doesn't interfere with the readings. My smart car now navigates corners much smoother thanks to accurate speed feedback.
Q: Can this sensor work directly with a 3.3V microcontroller like ESP32?
A: Yes, the module operates within a 3.3V to 5V range, making it fully compatible with ESP32, Arduino, and Raspberry Pi GPIO pins without needing level shifters.
Q: How do I connect this to count pulses?
A: Connect VCC to power, GND to ground, and the OUT pin to a digital interrupt pin on your microcontroller. You can then use a pulse counting library or interrupt service routine to tally the rotations.
Q: What is the maximum width of the object that can pass through the slot?
A: The slot width is approximately 5mm. Any opaque object thinner than 5mm that can interrupt the infrared beam will be detected effectively.
Q: Does this come with a pre-slit encoder disk?
A: No, this package includes only the photoelectric sensor module. You will need to provide your own encoder disk or slotted wheel to attach to your motor shaft.
Q: Is the output active high or active low when the beam is blocked?
A: Typically, the output goes Low (0V) when the beam is blocked and High (VCC) when the beam is clear, but please check the specific datasheet included in the package for your batch verification.
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