Description
Specification:
Model: HC-SR04
Size: 45x20x15mm(1.8×0.8×0.6inch)
Use voltage: DC5V
Quiescent current: less than 2mA
Output signal: Electric frequency signal, high level 5V, low level 0V
Induction angle: Not more than 15 degrees
Detection distance: 2cm-450cm
High precision: Up to 0.3cm
Connection mode: 4 interface sides, VCC for 5V power supply, GND for ground, TRIG trigger control signal input, ECHO echo signal output
Input trigger signal: 10uS TTL pulse
Output echo signal: Output TTL level signal, proportional to range
Package include:
5 x HC-SR04 Ultrasonic Sensor Module
How the module works:
1- Using IO trigger ranging to give a high level signal of at least 10us.
2- The module automatically sends eight 40khz square waves to automatically detect whether there is a signal return.
3- There is a signal return, a high level is output through the IO, and the high level duration is the time from the transmission to the return of the ultrasonic wave.
4- Test distance = (high time x sound speed (340M / S)) / 2.
Warning:
❣This module should not be connected with power. If you want to have a live connection, first connect the GND terminal of the module first, otherwise it will affect the normal operation of the module.
❣When measuring distance, the area of the measured object is not less than 0.5 square meters and the plane should be flat as much as possible, otherwise the measurement result will be affected.