HC-89 Infrared Photoelectric Slot Sensor Module 10mm Slot (LM393)
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Prices updated: 14 Oct 2026
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About this product
HC-89 is an infrared photoelectric slot sensor module with a 10 mm optocoupler gap, built around an LM393 comparator and an H2010 slot optocoupler. It outputs a digital signal that changes when an object blocks the beam, making it useful for counting workpieces and measuring motor speed with Arduino or Raspberry Pi projects.
Specifications
- Working voltage
- DC 5 V
- Slot width
- 10 mm
- Main chip
- LM393
- Slot optocoupler
- H2010
- Output
- Single-channel digital: high when blocked (LED off), low when clear (LED on)
- Sensitivity adjustment
- Not adjustable
Frequently asked questions
How do I wire the HC-89 to an Arduino?
Connect VCC to 5 V, GND to GND, and read the output pin on a digital input. The output goes high when the beam is blocked and low when it is clear.
Can I connect it directly to a Raspberry Pi?
The module runs at 5 V, while Raspberry Pi GPIO pins are 3.3 V logic. Check the output level before connecting it directly to a GPIO pin, and use level shifting if needed.
