okay,
you have to connect Vcc to 5V. then all you have to do is to directly connect the output of opamp to a pin of the microcontroller - as simply as it sounds - !
then in the programming part, for the pins attached to the sensor to act as input pins with which you can read the sensor, you have to initialise them as "1"
i'll write a litle C code to show you (this is not tested, there may be some syntax mistakes..)
void main(void){
P1_0 = 1 // set pin number 0 of port 1 to logic level "1"
While(1){
if (P1_0 == 1){
//the sensor detected smth.
}else{
// then sensor didn't detect anything..
}
}
}