HC-SR04 Ultrasonic Proximity Sensor Module (Radar) for Arduino

Features: 1. Compatible with Arduino, NodeMCU 2. Adopt IO trigger through supplying at least 10us sequence of high level signal 3. The module automatically send eight 40khz square wave and automatically detect whether receive the returning pulse signal 4. 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 5. 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) Specifications: Working Voltage : 5V(DC) Static current: Less than 2mA. Output signal: Electric frequency signal, high level 5V, low level 0V. Sensor angle: Not more than 15 degrees. Detection distance: 2cm-450cm. High precision: Up to 0.3cm Input trigger signal: 10us TTL impulse Echo signal : output TTL PWL signal