want Help SM0038 and AS017 Ir receiver with PIC

[nicko-391]

I want to get input from IR receiver if IR beam is reflected.(transmitter and receiver locate at same side)

I used SM0038 and AS017 IR receivers. I generated 38KHz IR beam using PWM but I could not get output from OUTPUT PIN of the receiver ( Low voltage).

Then I used burst signal and absence period for the IR beam.That was also useless.

I direct connected the IR LED to the PIC.

You see any wrong.Please give me some advises

 

[mister_rf]

TSOP1738 ~ SM0038
May should not work because we generate continuous pulse of IR at 38kHz rather than bursts of square wave with gaps.
See dataheet:

The data signal should fulfill the following condition:
Carrier frequency should be close to center
frequency of the bandpass (e.g. 38kHz).
Burst length should be 10 cycles/burst or longer.
After each burst which is between 10 cycles and 70
cycles a gap time of at least 14 cycles is necessary.
For each burst which is longer than 1.8ms a
corresponding gap time is necessary at some time in
the data stream. This gap time should have at least
same length as the burst.
Up to 1400 short bursts per second can be received
continuously.

---------- Post added at 23:49 ---------- Previous post was at 23:46 ----------

I was assuming using the correct pinout for the SM0038, place IR receiver face up, on the left pin= GND, middle pin Vcc, right pin=OUT.

 

[nicko-391]

I used middle pin as Vcc and right pin as OUT.Is it wrong?

I referred TSOP1738 data sheet.

 

[mister_rf]

Ups, my mistake, i wrote vice versa, IR correct pinout :grin:, but see the burst length and the gap time of at least 14 cycles necessary, as in the datasheet.