Generic Groove Coupler Speed Measuring Sensor Module - 5mm Slot, LM393 Comparator, 3.3-5V DC

The module operates from 3.3V to 5V DC, making it directly compatible with most microcontroller platforms like Arduino Uno, ESP32, and Raspberry Pi (using 3.3V logic). Ensure your power supply provides stable voltage within this range for reliable comparator operation and signal output.

The digital output provides a TTL-level signal. When the 5mm optical slot is unobstructed, the output is logic HIGH (typically VCC). When an object blocks the slot, the output switches to logic LOW (0V). An onboard LED illuminates when the output is LOW, providing immediate visual feedback. This clean digital pulse is ideal for direct connection to a microcontroller's interrupt or counter pin.

Yes, the analog output (AO) provides a voltage proportional to the received infrared light intensity. You can connect this to an MCU's ADC pin to set a custom detection threshold in software. However, for standard speed or pulse counting applications, the digital output (DO) from the LM393 comparator is recommended for its noise immunity and defined switching points.

The maximum detectable frequency depends on the response time of the optical sensor and the LM393 comparator. While not explicitly rated, typical modules of this design can reliably detect pulses in the low to mid kHz range, suitable for measuring motor speeds up to several thousand RPM, depending on the number of slots on your encoder disc.

Use the provided mounting hole to secure the module. Position the encoder disc so it passes cleanly through the 5mm groove without physical contact. Ensure the disc's slots or teeth are opaque to fully block the infrared beam. Proper alignment is critical for generating a clean, bounce-free digital waveform for accurate speed calculation or pulse counting.