The BDD LM393 Optical Speed Sensor Module is a compact slotted optical switch designed for accurate motor speed (RPM) measurement, object detection, pulse counting, and position sensing. Featuring an integrated LM393 voltage comparator and an imported infrared optocoupler with a 5mm slot, this module delivers clean digital output signals for reliable detection in automation and embedded applications.
Operating from 3.3V to 5V DC, the module is fully compatible with Arduino, ESP32, ESP8266, Raspberry Pi, STM32, and other microcontroller platforms. The digital output can be connected directly to a microcontroller input for measuring motor speed, counting encoder pulses, detecting object movement, or implementing limit switch functionality.
An onboard LED indicates the sensor output status, while the mounting holes allow quick and secure installation into robotics, CNC equipment, conveyor systems, and DIY electronics projects.
Features
- Part Number: BDD MINI SPEED SENSOR - LM393
- Slotted optical switch with integrated LM393 comparator
- Operates from 3.3V to 5V DC
- 5mm optical slot for encoder discs and object detection
- Digital TTL output
- Onboard output status LED
- Fast response with stable signal output
- Output drive capability greater than 15mA
- Mounting holes for easy installation
- Compact PCB design
- Compatible with Arduino, ESP32, Raspberry Pi, PIC, AVR and STM32
Specifications
- Product Type: Optical Speed Sensor Module
- Comparator IC: LM393
- Sensor Type: Slotted Optical Switch
- Operating Voltage: 3.3-5V DC
- Output Type: Digital TTL (DO)
- Analog Output: Not Used
- Optical Slot Width: 5mm
- Output Logic:Slot blocked: High
Slot clear: Low
- Output Drive Capability: >15mA
- PCB Dimensions: 32 × 14mm
Pin Configuration
- VCC: 3.3-5V Power Input
- GND: Ground
- DO: Digital TTL Output
- AO: Not Connected / Not Used
Applications
- DC motor RPM measurement
- Rotary encoder pulse detection
- Wheel speed sensing
- Position detection
- Object counting
- Limit switch replacement
- Conveyor monitoring
- Robotics
- Industrial automation
- Arduino and ESP32 projects
What's in the box
1 x BDD LM393 Optical Speed Sensor Module 3.3-5V Slotted Encoder Switch
