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HC-SR04 ultrasonic ranging module specification
1, the product features:
HC-SR04 ultrasonic ranging 2cm-400cm module may provide non-contact distance sensing function, high ranging accuracy up to 3mm; module includes an ultrasonic transmitter, a receiver and a control circuit.
The basic working principle: (1) The IO port TRIG trigger distance, a high level to a minimum 10us letter shape. (2) module automatically sends eight 40khz square wave, and automatically detects whether a signal is returned; (3) a signal is returned, through the IO port ECHO outputs a high level, the high level duration is super wave emitted to return from time. Test distance = (high level time * speed of sound (340M / S)) / 2 ;
2, physical map:
FIG follows wiring, VCC 5V power supply, GND is the ground, TRIG trigger control signal input, ECHO echo signal output terminal of the four interfaces.
3, electrical parameters
4, a timing chart of ultrasonic
Above timing chart shows that you only need to provide a more than 10uS pulse trigger signal, sent to the interior of the module 8 and 40kHz detected echo level cycles. Upon detecting the output of the echo signal with a reverberation signal.
The pulse width of the echo signals proportional to the measured distance. Whereby the reverberation time of the received signal can be calculated from the interval by transmitting signals. Formula: uS / 58 = cm or uS / 148 = inch; or: High Time * distance = velocity of sound (340M / S) / 2; recommended measurement period of 60ms or more, to prevent the effects of the transmit signal echo signal.
Note:
1, this module should not be connected to live, to live connection, then let the GND terminal to connect the module, otherwise it will affect
the normal operation of the module.
2, when the distance, the object area is not less than 0.5 m2 claim flat and planar as possible, or affect the measurement
result of
5, the physical specifications:
Above is the entire contents of this article, article learn from Shenzhen Jie Shenzhen Science and Technology Co., Ltd. http://xycsensor.cn.alibaba.com
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