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phototransistor IR

phototransistor problem

hi

 

I used to have my QRD1114 with a 10K pull-up resistor and everything was fine... but look I replaced it with IR emitter and IR receiver/phototransistor... I put a 12K pull-up to 5V on the collector, and between the collector and the resistor I get the signal... but I got only around 1.4 - 1.6 why?

 

Any simple ideeas?