How to use TSOP1738 ?

Other Hardware Sensors
1

Hello ,
We have got a new TSOP1738 sensor and unluckily we dont know how it works. It always gives a output one. And how to test it ??
Because , we have tested with a TV remote by pressing the buttons there and hoped to see the changes form the output pin of the TSOP sensor. But , the changes seen with the output pin are very minimum and when i press a button for 10 times, i get a output swiched to zero once. But, dont know what's the problem with the sensor. i tried with different sensors and i get the same response.

Please explain how to test TSOP1738 sensor and explain waves at 38 KHZ can be generated from a IR Led .

2

PLease post a link to the data sheet

3

Look at this:
https://arduino-info.wikispaces.com/IR-RemoteControl

The third rcvr from the left is a 1736. Similar to the 1738.

4

When you say "see the changes" what do you mean? You'll need an oscilloscope to see the pulses of the TV remote. The 38kHz signal is the carrier wave, and yes its presence will make the TSOP's output go low, but the TV remote's signal will be a sequence of nothings and 38kHz carrier, and will be too fast for you to "see" whatever that means.

If you use code like Ken Shirriff's, with his library, you will be able to decode the TV remote's signals on the Arduino.

You may find this "tutorial" of mine to be of some use.

5

Most IR receivers use inverted logic on the output. HIGH when idle and LOW when receiving a modulated IR signal.

So what you describe sounds right. Unless you have a tool to see changes of 100s of uSecs then dont try.

As already suggested use one of the IR libraries IRremote or IRLib.

see; http://www.sbprojects.com/knowledge/ir/index.php for all about IR remote control