The SunFounder HC-SR04 Ultrasonic Ranging module includes an ultrasonic transmitter, receiver and circuits. It has 4 pins: VCC, TRIG, ECHO and GND. The anti-reverse pin header onside makes it easy to connect and apply.
As for the ranging principle, it is quite simple to understand: pull up the pin Trig to High thus providing high level signals of at least 10us, so the module starts to detect and measure the distance; if an object is detected, the ECHO pin will be High, and the duration of it being High depends on the distance detected, thus giving the distance calculation formula: Distance = Duration of High ECHO * Speed of sound (340m/s)/2.
For more details, visit http://wiki.sunfounder.cc/index.php?title=Ultrasonic_Module
Operating voltage: 5V
Working current: 16mA.
Dimensions: 46 x 20.5 x 19.5 mm (thickness of anti-reverse pin socket included)
5 HC-SR04 Ultrasonic Sensors
10 Female-Male Dupont Cables
10 Female-Female Dupont Cables
1 Exquisite package box
Ultrasonic hc-sr04 distance measuring transducer sensor, it consists of ultrasonic transmitter, receiver, and control circuit.
HC-SR04 Ultrasonic Sensor Distance Module: using IO trigger for at least 10us high level signal，When triggered it sends out a series of 40KHz ultrasonic pulses and receives echo from an object.
Hc-sr04 Test Distance following formula: L = 1/2 × T × C ( L is the distance, T is the time between the emission and reception, and C is the sonic speed)
Power Supply : 5V DC; Quiescent Current : <2mA,; Effectual Angle: <15° ; Detection Distance : 2cm~450 cm; Resolution : 0.3 cm
Package Content: 5 HC-SR04 Ultrasonic Sensors , 10 Female-Male Dupont Cables , 10 Female-Female Dupont Cables , 1 Exquisite package box