circuit explanation

hey guys..i tried testing the motors with a simple code and it worked..n after dat, il tried it with the actual program and with the sensors connected..it doesnt work..but when i remove the connection from pin 14 - pin 2 (motor driver) and from pin 16 - pin 10 (motor driver), the motors are working fine..y doesnt it work with i connect these two pins..cn any1 help me plz?

as i understand
ur sensor is not working according to the logic of ur code
so pins are high in start up
when u disconnect one pin of controller and h bridge motor runs because its other input pin is high and connected to controller so motor runs
when anything come in front of the sensor its output goes high or low according to that write ur code
that will be easy to understand what is going wrong

hey majoka..i dun quite understand..so wat am i supposed to do now?rewrite my coding izit?

yes i suggest that make ur own code according to ur sensor that will be easy for u
r motors runs constantly when u disconnect the pin or run according to logic

hmmm...yup..the motors are running constantly when i disconnect the pins..not according to the logic..od u have any codes i cud use to test on?

first tell me
when anything come in front of the sensor op amp output goes high or low ?

when there is obstacle infront, the op amp output would be low..

i mke this one according to low logic as ur
code will vary according to ur hardware
i use pc817 opto coupler to drive h- bridge as i want to do separation between controller and motor supplies
connect emitter of pc817 to h-bridge and other pin connect to 5 volt
if u need schematic i will upload to make in Proteus
i make on at89c51 but at89c2051 is sufficient
here is the code