HC-SR04 Ultrasonic Module Distance Sensor fit for TokyMaker and Arduino UNO

EPLZON HC-SR04 Ultrasonic ranging transducer sensor
Test mode: Use IO to trigger high-level signals. (Not less than 10us), the module automatically sends 8 40kHz and detects whether there is a pulse signal return.
Detection area: 0.78~196 in/(2cm~500cm); high precision: up to 0.12 inch/(0.3 cm), effective angle: less than 15°; Trigger input pulse width: 10uS
Power supply: 5V DC; Quiescent current: less than 2mA;Dimension: 1.77 x 0.78 x 0.59 inches/45mm x 20mm x 15mm(length*width*height)
Test distance=((high level duration)*(sound wave: 340m/s))/2

Variant	3, 5, 10, 20

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