Question

Mrs. Halima has bought an ultrasonic ranging sensor module HC-SR04. P1.1) If the manufacturer claims this sensor to be IP66 compatible. Please explain the properties of the sensor Mrs Halima must check in this context! (4 points)

Answer 1

The 4 points Mrs Halima must check in this context are :

1. Measurement Range - The right measurement Range for you depends on your application,the smaller the transducer the smaller operating range,also keep in mind the all ultrasonic sensor have dead band in front of the sensor face.

Ultrasonic sensor are sometimes joined by microwave radar and video cameras to provide different,but complimentary views of their surroundings in home automotive application.

1. Types- Types which is good for home automation is the most popular form of object detection has been passive infrared(PIR) Sensor which detect heat from people and other object .

They have proven reliable but are more easy activated and fooled by temp.or light change,bugs and animals.

1. Basic Technical specifications -

                                                     Supply Voltage -5V

                                                     Minimum Range -3cm

                                                                 Ultrasonic frequency -40

                                                                 Resolution- 1cm

                                                                Global current consumption -15mA

1. Others - Distance measurement

              Loop control

                          Liquid level control

                          Vehicle detection for car wash and automative assembly.

And since the to be IP66 Compatible, the properties must check in this :

• It’s important to note that an IP66 enclousure is waterproof against house directed water,rain and snow.
• It’s not intended to be submerged in water.
• It should be complete protection from dust,oil and other non-corrosive material.

So before buying ultrasonic sensor, Mrs Halima must keep these points in mind.