HC-SR04 Ultrasonic Sensor

Highlights

• Compatible with Arduino, NodeMCU
• Adopt IO trigger through supplying at least 10us sequence of high level signal
• The module automatically send eight 40khz square wave and automatically detect whether receive the returning pulse signal
• If there is signals returning, through outputting high level and the time of high level continuing is the time of that from the ultrasonic transmitting to receiving
• This is ultrasonic sensor distance measuring module which a non-contact distance measurement module. It has high measurement accuracy and its blind area is close (up to 2cm)

Specification