Buy Ultrasonic Sensor Online -

If you have an Arduino or Raspberry Pi, it's a "plug and play" dream using the four standard pins: VCC, Trig, Echo, and GND . The Catch: HC-SR04 Ultrasonic Sensor Module - Quartz Components

These sensors are ubiquitous on sites like Amazon and AliExpress , making them incredibly easy to find for under $10. buy ultrasonic sensor online

For such a cheap component, it’s surprisingly accurate, often within 3mm . If you have an Arduino or Raspberry Pi,

It theoretically measures up to 400cm , but in my experience, it's most reliable for projects like automatic water tank monitors or obstacle-avoiding cars between 2cm and 80cm . it’s surprisingly accurate