Main block diagram of the digital speedometer:įig: Block diagram of digital Speedometer.
#Quickcal speedometer recalibration device software
Required software tools, FPGA and other equipments:ģ. SPEED_MULTIPLIER = 36 at a counter clock of 2.5 MHz as the circumference =185.3 cm. To calculate the speed, we use the formula: The input pulses from the transducer in the wheel are fed into a FPGA The calculation of the parameter is performed by counting the time between two consecutiverevolutions of the wheel. Speedometers would be stuck at an incorrect value or would dumbly show 0 velocity The velocity accurate at all times even at extremely small velocities where other If the current timer count has exceeded the last timer count between two interrupts, itĬalculates what the velocity would be if the input pulse arrived just now. The new velocity and if the pulse arrives very late or never at all, the same velocity isdisplayed.Ħ.
In other such devices, the device waits for another pulse to calculate Automatically senses a decrease in velocity even if there are no interrupts to the Change of speed is linear (like analog speedometer).ĥ. Sense pulses from a sensor (which attached in vehicle wheel) and then it calculate the speed ofthe vehicle and display the speed in a LCD or 7 segment display.ģ. A speedometer is used to display the speed of motor vehicle in km/hr.
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