通过超声波探头发射40KHZ的超声波，然后检测回波，测距 -Emitting ultrasonic 40KHZ ultrasonic probe, and then detecting an echo ranging

智能小车程序，包括L298N以及舵机、继电器下的智能小车，装有超声波探头，智能壁障，还有遥控功能- 智能小车程序，包括L298N以及舵机、继电器下的智能小车，装有超声波探头，智能壁障，还有遥控功能 Smart car program, including the L298N and servo, relay under the smart car, equipped w

超声波探头聚焦声场仿真和水浸探头以及相控阵探头，可以通过设置探头频率和探头直径，模拟超声发射声场，实用性强。(The simulation of focused acoustic field of ultrasonic probe can simulate the acoustic field of ultrasonic emission by setting probe frequency and probe diameter, which is practical.)