Quote:
Originally Posted by expert
thank you wm6 i well try to but another laser pointer is the green one stable to work thanks
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Green laser is one the best (of course it depend on how much mW we get out of it). There can be problem with directivity of sensor tube. Sensor have to be positioned in direction of reflected laser beam. Another problem is, if laser light wavelengt (color of laser light) does not correspond to fototransistor dedicated wavelenght (color light). Those two dedicated wavelenght have to correspond to each other.