hello,i'm want to make a fast line follower robot that will work under high ambient light condition (outdoor). i have 3 options to make line sensor: using ldr + led pair , or using simple IR emmiter detecter pair or using tsop1738 + 38khz IR. So can someone please help me to choose suitable sensor for line sensor? if there is anyway to make a sensor that will self adapt to environment? (some thing that will work on both bright sunlight and a dark room without manually adjusting sensors) thanks.