Speed Logger


This “device” is a combination of a speedometer, an odometer and a logging system. A typical speedometer displays the instantaneous speed. This device is a bit different. It measures the speed at defined intervals of time and displays it. But more importantly it takes the speed and selects the range it belongs to. For example 0-10, 10-20 kmph etc. are speed ranges represented as 1, 2 and so on. That particular range is then incremented. The values in each such ranges are displayed as a histogram. Thus this system provides a spectral view of the time spend in each speed range. This system has been visualized using an Arduino to communicate with the Matlab software on the computer. The PIC microcontroller runs the LCD display to show the user what speed is being simulated. That speed is transmitted to the computer through the Arduino. Matlab then gets that speed, selects the range, increments it and produces the updated histogram.

E.g.: The potentiometer (in the video) simulates the speed of the vehicle and it is shown in the LCD display. The speed falls in a particular range and thus that value is incremented. If the checking and updation is done every second, then the values in each range represents the number of seconds the vehicle spends in each of those speed ranges. Thus we get a speed logging system. Why is this system an improvisation? The current system tells only the distance travelled (odometer). However there is no measurable way to determine how that distance is travelled – at what speeds? Travelling 2 hours at 50 kmph will show the same result as 1 hour at 100 kmph, but travelling at 100 kmph is definitely more rash. This system, since it logs the speed, is a definite way to determine how the vehicle has been driven. Its implementation in bikes can help parents monitor rash driving. It can also help governmental  transport agencies monitor how their public transport vehicles likes buses are driven. The major use is to foster safety through data monitoring and logging. Obviously, speed isn’t the only factor in safety and so it’s a natural conclusion that logging speed might not have a huge impact.

The real safety provider is human psychology. For example, writing an exam with or without an invigilator, the students tend to follow the rules or cheat respectively. Therefore, its a psychological factor that when drivers know that their speeds are being logged, they will be less prone to rash driving. However, the system itself presents a way to integrate both a speedometer and an odometer, providing the functionality of both and a little more as well (logging).


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