HC-SR04 4Pin Ultrasonic Sensor

Specifications:

• Operating Voltage: DC 5 V
• Operating Current: 15 mA
• Operating Frequency: 40 Hz
• Maximum Range: 4 m
• Minimum Range: 2 cm
• Measurement Angle: 15 degrees
• Trigger Input Signal: 10 µS TTL pulse
• Echo Output Signal: TTL level signal proportional to the distance