{"product_id":"lm393-motor-speed-sensor-module-for-arduino-rpm-measurement","title":"LM393 Motor Speed Sensor Module for Arduino RPM Measurement","description":"\u003ch1\u003eLM393 Motor Speed Measuring Sensor Module – Slot-Type Optocoupler with Comparator Output\u003c\/h1\u003e\n\n\u003cp\u003eThe LM393 Motor Speed Measuring Sensor Module combines a slot-type infrared optocoupler with an LM393 precision comparator to deliver clean digital pulses for rotational speed measurement. By detecting interruptions from an encoder wheel or slotted disk, it provides accurate RPM data to any microcontroller. This module is a reliable choice for robotics, motor feedback systems, and DIY tachometer projects.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e3.3V to 5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eComparator IC\u003c\/td\u003e\n\u003ctd\u003eLM393\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutput Type\u003c\/td\u003e\n\u003ctd\u003eDigital (TTL compatible, active low)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSlot Width\u003c\/td\u003e\n\u003ctd\u003e4 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDetection Method\u003c\/td\u003e\n\u003ctd\u003eInfrared slot-type optocoupler\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e32 x 14 x 7 mm (approx.)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eMeasure RPM of DC motors for precise speed control in robotics\u003c\/li\u003e\n  \u003cli\u003eBuild a digital tachometer for a drill press or lathe\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/mini-conveyor-belt-speed-control-kit-with-arduino-and-stepper-motor\"\u003eImplement speed feedback for a conveyor belt system\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003eCount revolutions for a custom odometer or usage tracker\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis module works with any 3.3V or 5V microcontroller, including Arduino Uno, Nano, Mega, ESP32, ESP8266, Raspberry Pi Pico, and STM32 boards. The digital output connects directly to a GPIO pin. Pair it with an encoder code wheel (not included) with slotted holes to generate pulses proportional to speed.\u003c\/p\u003e\n\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eConnect VCC to your microcontroller's 3.3V or 5V pin, GND to ground, and OUT to any digital input pin. The signal goes low when the slot is blocked by an opaque section of the encoder disk. No external pull-up resistor is required, but adding a 10kΩ pull-up can improve noise immunity in harsh environments.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\n\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\n\n\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino?\u003c\/summary\u003e\u003cp\u003eYes, connect VCC to 5V, GND to GND, and OUT to any digital pin. Use the pulseIn() function to measure pulse width or attach an interrupt to count pulses for RPM calculation.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes it work with 3.3V systems like ESP32?\u003c\/summary\u003e\u003cp\u003eAbsolutely. The LM393 comparator operates reliably at 3.3V, and the output logic level matches the supply voltage, making it safe for 3.3V GPIOs.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan it measure low RPM accurately?\u003c\/summary\u003e\u003cp\u003eYes, it can detect very slow rotations as long as the encoder disc passes through the slot. Measurement resolution depends on the number of slots in your encoder wheel.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53444959895917,"sku":"CDN-0360","price":40.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/download_5979e3c3-c853-4316-9727-27009669da44.jpg?v=1781527337","url":"https:\/\/compoden.com\/products\/lm393-motor-speed-sensor-module-for-arduino-rpm-measurement","provider":"Compoden","version":"1.0","type":"link"}