I want to measure distance in rainy days.
1.Can I use ultrasonic sensors? Can the two speakers of the ultrasonic sensor be blocked, or else they will be useless?
2. If I cannot use ultrasonic sensor. Is infrared ranging sensors the only choice? Can the infrared sensor be protected by a transparent plastic case? Will the transparent plastic shell reflect and refract infrared rays? ?
3.Or should I try radar sensor?