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HC-SR04 Ultrasonic Sensor Distance Measuring Module for Arduino
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). Features: - Compatible with Arduino£¬ NodeMCU - Arduino library ready: HCSR04Ultrasonic - Working voltage: 3-5.5VDC - Static current: less than 2 mA. - IO logic voltage: 3.3V / 5V. - Induction angle: not more than 15 degrees. - Detection range: 2-400 cm. - Accuracy: 3mm - 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.