The goal of this diploma work was to create a device or prototype, which would measure speed with a radar speed detector. Excessive speed of vehicles in suburbs and in general is a serious problem; hence it would be interesting to look into this mater more closely.
We created a prototype, which, using a module with a build-in radar, measures speed and displays it on 7 segment LED-displays. We used radar module BGT24LTR11 and its accompanying development module XMC4700.
We created the circuit scheme in the EAGLE program. We used three multicolor LED-displays, which are controlled in the multiplex style. An individual numeral is controlled by a transistor, while segments of LED-displays are turned on using transistor arrays, controlled by 8-bit shift registers. Three serial shift registers are used, one for red, green and blue color, each. The current through LED-display segments is limited with series resistors. Onto a proto board we attached all necessary elements, connected them and soldered them into place. Later we connected the proto board with the radar equipped module, by reprograming the development module with the Arduino program.
The prototype detects the speed that is displayed on the LED-displays. Allowed speed is displayed in green color, borderline speed in yellow and excessive speed in the red color.
The advantage of our prototype over the existing speed displays are the different colors on the LED-displays, as we determined that it is a user-friendly way of warning of excessive speed.
|
