On Variable Changed icon On Variable Changed — Run scripts automatically when specified ARC variables change; define variable-to-script pairs, monitor status, and trigger actions. Try it →

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#9  

THE CREATE does a great job of finding home base and starts charging ,it uses 360 deg type of laser(modulated IR) and IR receiver also there other designs using a laser and camera or detector ,the RSSC robotic club i am in has a really good home base tracking design,need to look for the link on floor maps and more