Try to adjust the line of sight LEDs so that the buzzer gets Off. Ensure that both the LEDs face each other. Here is what you need to do next: 5.1 Bring both the circuits completely closer to each other. Check the voltage using your multimeter (tutorial included in the video) 5. Please note the battery voltage should be more than 9V in any case. The middle terminal is the common terminal (COM) and side terminals are the supply terminals. Connect its two terminals to the supply terminals of the relay (the two opposite terminals). Ensure that the relay is tightly fitted onto the breadboard. Check whether the negative terminal of the buzzer and the green wire going to the NO terminal of the relay are connected in the same column. The positive terminal of the photo-diode in the receiver circuit must be connected to ground. Check all the wires and their lengths and ensure that the tip of the stripped end touches the inside metal strip. The stripped portions of wires that go inside the breadboard must be at least 1 cm in length. You will need to check them all one by one: 1. We have not got the opportunity to review your circuit.
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