In this Video Lesson I will teach you how to use echolocation to measure distances. We will use the HC-SR04 Ultrasonic Sensor, and will use the Raspberry Pi Pico W. We will explain how echolocation works, and show you how the sensor works. We will do the math, and then create the code for making measurements.
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import machine import time TRIG_PIN = 16 ECHO_PIN = 17 TRIG = machine.Pin(TRIG_PIN,machine.Pin.OUT) ECHO = machine.Pin(ECHO_PIN,machine.Pin.IN) def distance(): TRIG.low() time.sleep_us(2) TRIG.high() time.sleep_us(10) TRIG.low() while (ECHO.value()==0): pass time1=time.ticks_us() while (ECHO.value()==1): pass time2=time.ticks_us() pingTime=time.ticks_diff(time2,time1)/2 d=.0343*pingTime return d while True: dist=distance() print("Distance to Target: ",dist," cm") time.sleep_ms(250) |