Does HC-SR04 ultrasonic sensor cause harmful effects, when exposed towards human beings ??
Does HC-SR04 ultrasonic sensor cause harmful effects, when exposed towards human beings ??
of course Dogs could possible hear it (Not 100% sure), also some ultrasonic transducers use clicks that can be picked up by other devices you may be using in the vicinity (Cell phones, camera microphones etc) but as John stated, no risk to us upright mammals 
