MOC7811 OPTO SENSOR

The MOC7811 Slotted Opto-Isolator is a slotted optical sensor with an IR LED emitter and phototransistor receiver facing each other across a 3mm-wide, 7mm-deep slot. When an object passes through the slot it interrupts the IR beam, changing the phototransistor output state. Used for rotary encoder position sensing, motor speed measurement, and object detection.

Specifications:

• Slot Width: 3mm
• Slot Depth: 7mm
• Mounting Hole Spacing: 19mm
• Mounting Hole Diameter: 3mm

Connections:

• IR LED: Anode — VCC (with series resistor), Cathode — GND
• Phototransistor: Collector — VCC (with pull-up), Emitter — GND; output taken at Collector

Applications:

• Motor shaft encoder (speed/position feedback)
• Factory automation robots
• Computer printers and plotters
• Non-contact object/interrupt detection