sensor modules

 HC-SR04 Ultrasonic Distance Measuring Transducer Sensor Module Arduino

Feature:

• Voltage: DC5V
• Static current: less than 2mA
• Level output: high-5V
• Level output: the end of 0V
• Sensor angle: not more than 15 degrees
• Detection distance: 2cm-450cm
• High precision: up to 0.3cm
• Connection: VCC, trig (control side), echo (receiving end), GND