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Would you give me a hand ?

I have an IR sensor with 3 pins. It looks like the one in the picture, and I did not find any datasheet for it on the internet. actually, I have 3 questions :

1- I want to identify its pins ? (Where can I put the positive, ground ...etc. ?)

2- How to connect it with a visible LED so that when the IR sensor receive IR Rays, the LED lights up ?

3- Should I transmit IR Rays with a specific frequency ? or just connect IR LED to the power only ?

enter image description here

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  • \$\begingroup\$ Helping you is quite difficult. Where did you buy/found this receiver? Can you provide a photo of it? \$\endgroup\$ – Vladimir Cravero Aug 9 '14 at 10:42
  • \$\begingroup\$ Hi Vladimir, I found it in an receiver (TV). this is the picture : i.stack.imgur.com/H91t9.jpg \$\endgroup\$ – Michael George Aug 9 '14 at 10:44
  • \$\begingroup\$ A photo of the pcb where you took it from is the only way to be extra sure of the pinout. These guys have two power pins (Vcc and ground) and a digital output. They expect a IR signal pulsed at some 10s of kHz modulated by your information signal. \$\endgroup\$ – Vladimir Cravero Aug 9 '14 at 10:46
  • \$\begingroup\$ thank you very much for your answer :) is there any way to identify the Vcc and ground ? \$\endgroup\$ – Michael George Aug 9 '14 at 10:49
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    \$\begingroup\$ Read the datasheet. \$\endgroup\$ – Phil Frost Aug 9 '14 at 12:27
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I have an IR receiver that looks like yours. The one I have is equivalent to this TSOP38238 from Adafruit:: enter image description here

This IR detector demodulates a modulated IR at 38kHz and provides a digital decoded signal at the output.

Assuming it's the same one; here's the pinout: enter image description here

The DATASHEET is available here (TSOP38238).

Head over to Adafruit for all the details including how to connect to a visible LED: enter image description here

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I have a method to find the pin outs ,my method is by luck though but is quite easy if you got the sensor out of a PCB of an old electronic if its able to power up. if can power it up do a continuity test find in the 3 pins which is ground after you found the ground mark it if your able to or remember it and find another pin with a voltage of 3.3 volts and that it u found the pin out hope i help someone

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It looks very much like a TSOP382xx from Vishay, available at Adafruit: https://www.sparkfun.com/products/10266 You can find a datasheet there also.

The carrier frequency depends on which model you have, the last two digits in the part number.

enter image description here

enter image description here

As you can see from the block diagram above pin 1 is your output (far left on your picture). The receiver sinks pin 1 when the correct carrier is detected. But it can only sink a maximum of 5mA so you must limit the diode current if you hook one up directly to the output. I would use a buffer stage of some sorts. Hint: you could probably make one yourself with a PNP transistor.

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