Motion Detector Circuit Diagram: Motion Detector Circuit Explanation: The IR sensor will make the high frequency beam of 5 kHz with the help of 555timer which is set to astable multivibrator mode at the transmitter section. An IR sensor consists of two parts, the emitter circuit and the receiver circuit. Circuit Diagram. By using a transistor, we can turn dirty analogue from the photodiode into clean analogue which the output LED likes better. The circuit shows that the output of IC1 555 IC, which is designed for a duty cycle of 0.8mSec, with a frequency of 120Hz and 300mA peak current, is used to drive the infrared LED, D1. This type of infrared sensor measure just infrared radiation, instead of discharging it that is known as an inactive infrared … Diode: 1x IR LED, 1x Generic LED, 1x Photodiode This is collectively known as a photo-coupler or an optocoupler. Every IR sensor is consisting of three main things in its circuit, which are IR transmitting LED, Photo diode to receive the IR signal and the signal amplification circuit. The IR phototdiode is sensitive to the IR light emitted by an IR LED. The first IR circuit will just show how the pair (IR LED & Photodiode) works. From the connection it is clear that the diodes D1 and D2 are on the same line, just a few centimeters apart, on the breadboard. And non-inverting end (PIN 3) is connected to the junction of photodiode and a resistor. Here an operational amplifier (op-amp) of LM 339 is used as comparator circuit. You can see the connections in the IR sensor circuit diagram. The circuit can be used as an obstacle detector by placing both the IR transmitter LED and photodiode side by side. Since this variation cannot be analyzed as such, therefore this output can be fed to a comparator circuit. Photo diode is connected in reverse bias, inverting end of LM358 (PIN 2) is connected to the variable resistor, to adjust the sensitivity of the sensor. The circuit is very simple, all it needs is: Resistor: 2x 220ohm (or similar), 1x 10k. Components Required. An IR output terminal of the receiver varies depending upon its receiving of IR rays. When the IR receiver does not receive a signal, the potential at the inverting input goes higher than that … The emitter is an IR LED and the detector is an IR photodiode. LM358 IC; IR Transmitter; IR Receiver; 10 KΩ Potentiometer; Led; Resistor (1 KΩ, 10 KΩ, 220 Ω) Piezo Buzzer; A Switch; 9V Battery; ... An infrared sensor can quantify the warmth of an item just as it distinguishes the movement. In this project, the transmitter section includes an IR sensor, which transmits continuous IR rays to be received by an IR receiver module. The IR sensor will produce the high frequency beam which is received by the photo resistor at the receiver section. Thus diode D2 receives the infra-red output from the diode D1. The circuit shown here is also consist these three things.