: A widely used soil moisture sensor often found in similar DIY electronics listings. YL 105 - YALAN Seals - China Mechanical Seal Standard Maker
The YL-105 is widely used in various industrial and commercial applications, including: yl-105 datasheet
Connect DO to an Arduino digital pin with a pull-up resistor enabled (or use INPUT_PULLUP ). Place a small neodymium magnet on a rotating shaft. Each time the magnet passes the YL-105, the output goes LOW. Use interrupts to count pulses per minute. : A widely used soil moisture sensor often