how robot tracking ball with fixed distance?

bash_bob

I am tracking ball with camera in my android phone and send x,y position,radius of ball (x,y position is a pixel in screen android phone ) to my stm32f board via bluetooth. I assemble my phone and stm32f1 kit in a mobile robot. Now i would like my robot move to ball with a fixed distance. Ex: I set distance 10cm. When i move ball forward, my robot forward to ball and always keep 10cm from robot to ball

Originally asked by Bruce on Stack Exchange (stackoverflow) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

Here is some pseudo code to get you started: while (TRUE) do get x, y position of ball get x, y position of self calculate distance between self and ball (hint: use Pythagoras) if (distance < 10 cm) move away from ball else if (distance < 10 cm) move towards ball end Now all you have to do is code this up in C.

Full answer by Paul R: https://stackoverflow.stackexchange.com/a/36625617 (CC BY-SA 4.0).

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