Introduction
This kit mainly includes 3 HR-SR04 blue ultrasonic modules.As the ultrasonic has strong directivity, slow energy consumption and far spread distance in the media, so it is commonly used in the measurement of distance, such as range finder and position measuring instrument. Using ultrasonic is more rapid, convenient, simple to calculate and more easier to achieve real-time con trol, so it has also been widely used in the development of mobile robots.
Ultrasonic detector module can provide 2cm-450cm non-contact sensing distance, and its ranging accuracy is up to 3mm, very good to meet the normal requirements. The module includes an ultrasonic transmitter and receiver as well as the corresponding control circuit.
Test distance = high level duration * 340m/s * 0.5.
1. First pull down the TRIG, and then trigger it with at least 10us high level signal;
2. After triggering, the module will automatically transmit eight 40KHZ square waves, and automatically detect whether there is a signal to return.
3. If there is a signal to return, through the ECHO to output a high level, the duration time of high level is actually the time from emission to reception of ultrasonic.
Parameters
Working voltage：0.5V(DC)
Working current：15mA
Detecting range：2-450cm
Detecting angle：15 degrees
Input trigger pulse：10us TTL Level
Output echo signal： output TTL level signal(HIGH)，proportional to range.
