control servo motor by blutooth

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i want code of servo motor work when turn on leds in bluetooth rc controler app on android ,in way ,servo turn 90 degree when led on ,and when led turn of servo rotate 90 in other direction..servo connected sh.l293d ,,plz me

wait, wiat, led it? "when led on" isn't clear. also, l293d has no control on motor's position (90 degrees). tells motor spin faster or  slower or stop, in direction.

if give more details  want do, how want work, maybe clearly  understand


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