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i have solved my second problem by my self so any one want it ,, it's free to get it

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hassan ali

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first sorry for my English language.
from start, i was making a balance robot circuit using 555 ic , and we all know that it's available on a lot of websites but this circuit need a servo motor
(3 terminals), but i can't find this motor so i decided to build this circuit and design it again using (adc, 8051) so by changing the value of photo resistor
the motor will change it's rotation ,but in this schematic u will find 2 potentiometer (there are instead of photo resistors) to make this circuit in real u have to change these 2 potentiometer with 2 photo resistors.
here is the schematic diagram and asm code.
follow this link:
http://www.megaupload.com/?d=CY6UNP0D
 

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