![]() The reason for that is an ideal ultrasonic sensor has an operation angle of 30 degrees. That is a complete clockwise and anticlockwise movement of the servo shaft returns a total of 360 values.Īs mentioned above, in this project the sensor measures the presence of an object at an angle of 210 degrees. In an ideal case, the ultrasonic sensor will return a value for each degree of the servo. ![]() Here then the measured instantaneous distance values are printed on the serial monitor. With this sweeping movement of the servo, the ultrasonic sensor placed on the servo arm scans the entire area comes in front of the sensor. The servo moves the arm in a range of 180 degrees clockwise and anti-clockwise direction. The servo motor has programmed to sweep the shaft in to and fro motion. The Servo mounting brackets for HCSR-04 ultrasonic sensors are available or a similar holder can be assembled by ourselves. Here an ultrasonic sensor is mounted on the servo shaft and the servo motor is fixed to the robot chassis. That is the entire area where the servo arm points with a single ultrasonic sensor. Using this method the ultrasonic sensor can scan large areas up to 210 degrees (using micro servos with 180-degree movement). ![]() So another technique to expand the range of scanning area is mounting the ultrasonic sensor on a servo arm. But in this method more numbers of sensors are required to scan wider areas for example, 6 numbers of sensors will be required to scan an angle of 180 degrees. One of the methods to overcome this area limitation is by using multiple ultrasonic sensors at a time. So we should have to use different techniques to scan wider areas. A fixed ultrasonic sensor has an operating angle of 30 degrees only.
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