How can we measure the instantaneous speed of robot directly with much effect in construction of it? else what device we need to measure the instantaneous speed of the robot?
I want to have on robot display .i want a have display device through which we can measure it directly as the robot moves.The robot is made from microcontrolller concept. I just want to measure the rut instantly as the robot moves ahead.
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It is also a embedded type robot and wheels are like a usual toy car.
The problem is that the speed of movement is relative to some external structure, like room wall.
If you wish to make such sensor simple, use an IC accelerometer and connect an integrator; The result is acceleration over time, or speed. No external reference is necessary. Such devices are used in cell phones or game consoles.
For precise speed measurement you will need a 3D sensor, possibly ultrasonic, to generate Doppler signal(s) relative to room walls or a specific reflector located to be detected by all sensors during a movement.