You can see the connections in the IR sensor circuit diagram. Photo diode is connected in reverse bias, inverting end of LM358 ... EXCELLENT TUTORIAL. FINALLY I SUCCESSFULLY ASSEMBLED THE PROJECT. ...

Fig. 4 shows the prototype module with the sensor and LM358 used in this project. VCC, gnd and output terminals are shown in the module. Fig. 4: Module with IR sensor pair and LM358 Relay. Pin diagram ...