UltraSonic Sensor Module HC-SR04 (China Make)

Ultra Sonic Sensor Module Hc-Sr04 is a ultrasonic ranging sensor. This economical sensor provides 2cm to 400cm of non-contact measurement functionality with a ranging accuracy that can reach up to 3mm. Each HC-SR04 module includes an ultrasonic transmitter, a receiver and a control circuit.There are only four pins that you need to worry about on the HC-SR04: VCC (Power), Trig (Trigger), Echo (Receive), and GND (Ground). The basic principle of work:

•  Using IO trigger for at least 10us high level signal.
• The Module automatically sends eight 40 kHz and detect whether there is a pulse signal back.
• IF the signal back, through high level , time of high output IO duration is the time from sending ultrasonic to returning. Test distance = (high level time×velocity of sound (340M/S) / 2

Features of Ultra Sonic Sensor Module Hc-Sr04

• Operating Voltage: 5V DC
• Operating Current: 15mA
• Measure Angle: 15°
• Ranging Distance: 2cm - 400cm
• Working Frequency : 40Hz
• Trigger Input Signal : 10uS TTL pulse
• Echo Output Signal : Input TTL lever signal and the range in proportion

Note: This is a low cost chineese product for students. If you want a professional one. Please go through ECHO-PRO , UltraSonic Distance Sensor (Serial ASCII O/P) , UltraSonic Distance Sensor (PWM O/P)

Package includes:

• 1 x Ultra Sonic Sensor Module Hc-Sr04

Deveolpment resources:

• Datasheet
• Example Tutorial