Distance measurement module HC-SR04 Ultrasonic Arduino support, contactless free
1.Working Voltage: 5 V (DC)
Actual 2.Static: Less than 2 mA.
Output signal: frequency electrical signal, high level 5V, 0V low.
Sensor detection angle: ≤ 15 °
Detection range: from 2cm to 500cm.
Accuracy: Can detect variations of up to 0.3 cm
Sign commissioning: TTL signal 10 microseconds
Output signal: TTL signal PWL ("piecewise linear" piecewise linear)
Two. Trigger Pulse Input (input signal)
Three. Echo Pulse Output (output)