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Battery almost out of power - might affect the measurements
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The delay from sending a ultrasonic sound, until the echo is received is 2*distance/speed of sound.
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For the maximum distance of 2,54m the delay will be 2*2.54m /343.21m/s = 14.8ms.
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Assuming the air temperature is 20 degrees of celcius.
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This puts a physical time limitation on the usage of the sensor.
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### Exercise 4
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The program described in exercise 4 is able keep a fixed distance to an object in front of the regulated device. In order to so it implements a linear feeback system in terms of a proportional only controller where the feedback is the measured distance to the object. By subtracting the measured distance from the setpoint and multipliyng this by a Pgain factor the program will make the car drive fast when it is far away from the object and decrease the speed as it gets closer to the object.
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