The propagation speed of sound in the air is about 340m/s, therefore,
distance = speed * time, because the ultrasonic wave emits and comes
back, which is 2 times of distance, so it needs to be divided by 2, the
distance measured by ultrasonic wave = (speed * time)/2
(3)Parameters:
Working voltage: 3-5.5V (DC)
Working current: 15mA
Working frequency: 40khz
Maximum detection distance: about 3m
Minimum detection distance: 2-3cm
Precision: up to 0.2cm
Sensing angle: less than 15 degrees
Input trigger pulse: 10us TTL level
Output echo signal: output TTL level signal (high), proportional to range
(4)Experimental Preparation：
Insert micro:bit board into slot of keyestudio 4WD Mecanum Robot Car
Place batteries into battery holder
Dial power switch to ON end
Connect micro:bit to computer by USB cable
Open online Makecode editor
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