{"product_id":"yf-s201-water-flow-sensor-1-30lmin-hall-effect-pulse-output","title":"YF-S201 Water Flow Sensor (1-30L\/min) - Hall Effect Pulse Output","description":"\u003ch1\u003eYF-S201 Water Flow Sensor\u003c\/h1\u003e\n\u003cp\u003eThe YF-S201 is a hall-effect water flow sensor that outputs frequency pulses proportional to flow rate. It’s commonly used in liquid measurement projects with microcontrollers like Arduino, ESP8266, and Raspberry Pi. The sensor handles flow rates from 1 to 30 litres per minute with ±3% accuracy.\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\u003eFlow Range\u003c\/td\u003e\n\u003ctd\u003e1 – 30 L\/min\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutput Pulse Rate\u003c\/td\u003e\n\u003ctd\u003e450 pulses\/L (F = 7.5 × Q Hz)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e5 – 24V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Current\u003c\/td\u003e\n\u003ctd\u003e≤15 mA at 5V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Water Pressure\u003c\/td\u003e\n\u003ctd\u003e1.75 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003e1\/2\" BSP thread\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\u003e\u003ca href=\"\/products\/kit-automatic-plant-watering-system\"\u003eAutomatic plant watering system\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003eWater consumption monitor for household\u003c\/li\u003e\n  \u003cli\u003eFlow-controlled coffee dispensing machine\u003c\/li\u003e\n  \u003cli\u003eLeak detection and pipe burst alarm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eDesigned for use with any 3.3V or 5V microcontroller. Connect the yellow signal wire to a digital input with a 10kΩ pull-up resistor. Works directly with Arduino Uno (5V), ESP32 (3.3V with pull-up to 3.3V), and Raspberry Pi (via GPIO with level-safe pull-up voltage). Supply voltage can be taken from the board’s 5V pin.\u003c\/p\u003e\n\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eRed = VCC (5–24V), Black = GND, Yellow = pulse output. Always install the sensor with the flow arrow pointing in the water direction. Use a 1k–10kΩ pull-up resistor from the signal line to your microcontroller’s logic voltage. Avoid exceeding 1.75 MPa pressure to prevent damage.\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 Uno?\u003c\/summary\u003e\u003cp\u003eYes, connect VCC to 5V, GND to GND, signal to pin 2 with a 10kΩ pull-up to 5V. Use the pulseIn() function or interrupts to count pulses.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I use this with a 3.3V Raspberry Pi?\u003c\/summary\u003e\u003cp\u003eYes. Power the sensor with 5V from the Pi’s 5V pin, but pull the signal line to 3.3V using a 10kΩ resistor to a 3.3V source. Then connect to a GPIO pin. The open-collector output is safe for 3.3V logic when pulled up correctly.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the minimum flow rate it can detect?\u003c\/summary\u003e\u003cp\u003eThe sensor reliably detects flows from 1 L\/min upward. Below 1 L\/min, the internal rotor may not spin consistently, and pulse output becomes irregular.\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":53445105025389,"sku":"CDN-0356","price":190.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_ca3df8e5-2b27-4ecc-bb88-063c138b6356.jpg?v=1781513322","url":"https:\/\/compoden.com\/products\/yf-s201-water-flow-sensor-1-30lmin-hall-effect-pulse-output","provider":"Compoden","version":"1.0","type":"link"}