How does a 4 pin Infrared Object Sensor work ?

[DollarAkshay]

Can someone tell me how this IR sensor works ? I would be glad if you could point me to a tutorial or a blog that uses this exact component. I really need your help.



High Resolution Images of the Back and front here : http://imgur.com/a/YLewm

NOTE : This sensor has 4 pints (5V, GND, OUT, OUT) and all the blogs that i have seen online either have 3 pins or a white hemisphere on the module.

[DollarAkshay]

Please Help someone ?

[BMS Doug]

You can see the labeling of the components:

• IR TX would be Infra-Red Transmitter.
• IR Rx will be Infra-red Receiver.
• Output LED will turn on whenever the outputs would be on.
• Calibration (R3) variable resistor will determine sensitivity.
• IC will cause the outputs to be on when the IR detects a nearby object.

This page should help, his circuit is fundamentally identical.
I found his page by Googling the search terms: "IR object detection circuit diagram".

[tenochtitlanuk]

I think you are confusing two different TYPES of circuit.
What you have is a 'retro-reflective' device, which transmits a near-IR signal and detects its reflection from a nearby object.
The 3-pin ones with a white dome are passive detectors of heat radiation further into the IR from warm objects nearby.
They are NOT interchangeable.

[boyoh]

The IR object sensor , as two IR LEDs 1 Transmitter TX led. 1 Receiver RX
1 led showing object signal received. A IR signal is transmitted , this signal
Is reflected back off the object and processed as a out put signal
The 4 connections ( 5v+ / gnd) ( OUT) (OUT )

Some multi meter testing might might tell what the OUT signals are
Test between GND and each OUT terminal ( intern) ON & OFF
Make not of reading ( volts) There is a possibility of using a Opto Isolator
To inter face withe the Pi