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Electronics => Electronics => Topic started by: shyam4uall on September 14, 2008, 08:04:27 AM

Title: How to generate bursts for IR Detection
Post by: shyam4uall on September 14, 2008, 08:04:27 AM: Please help me....i can't get those bursts ??? I can generate 33Khz frequency through 555 but its continuous one ,how to make those with bursts ??

I am not using any PIC.I have heard that the bursts can be produced through another 555 but how in which mode they should operate and what frequency it should generate ?

I am using TSOP 1333 for IR detection.
Title: Re: How to generate bursts for IR Detection
Post by: aruna1 on September 14, 2008, 10:59:33 AM: well i think you should use second 555 to trigger first 555(that creates33khz signal) in timely manner to get 33khz bursts
Title: Re: How to generate bursts for IR Detection
Post by: shyam4uall on September 14, 2008, 11:25:14 AM: how can i calculate all those stuffs bursts cycles etc. etc.?? both 555 timer should operate in astable mode ?? what frequency should the first 555 timer generate ??
Title: Re: How to generate bursts for IR Detection
Post by: aruna1 on September 14, 2008, 11:30:44 AM: well i'm not good with 555 timer.you need to ask a expert
Title: Re: How to generate bursts for IR Detection
Post by: ArcMan on September 14, 2008, 06:56:14 PM: aruna1 gave you good advice. There's oodles of information on the web about 555 timer usage that will give you the details about how to accomplish what he suggests.
Title: Re: How to generate bursts for IR Detection
Post by: aruna1 on September 14, 2008, 07:12:17 PM: Quote from: ArcMan on September 14, 2008, 06:56:14 PM
aruna1 gave you good advice. There's oodles of information on the web about 555 timer usage that will give you the details about how to accomplish what he suggests.

:)
Title: Re: How to generate bursts for IR Detection
Post by: binu_ji on September 29, 2008, 11:07:15 PM: Quote from: shyam4uall on September 14, 2008, 11:25:14 AM
how can i calculate all those stuffs bursts cycles etc. etc.?? both 555 timer should operate in astable mode ?? what frequency should the first 555 timer generate ??
The frequency of the first IC555 can be around 100hz.
Title: Re: How to generate bursts for IR Detection
Post by: izua on September 30, 2008, 01:27:05 AM: Just use a transistor to permit/deny the 555's output.
Title: Re: How to generate bursts for IR Detection
Post by: TrickyNekro on September 30, 2008, 01:50:48 AM: Look the 555 is the worst way...
I use the 16 bit counter of my AVR....

Look there is an old trick about this.... You can make a robot follow something by this....
Lower frequencies have longer wave length cause the material the pass through remains the same (air).
You can find it by this math: u = f X l (where u is speed, f is frequency and l is wave length)

So if the basic detection range of the 33kHz burst is 30cm let's say, the 38kHz would be 10cm let's say and 29kHz burst would be 60cm!!!!
Let alone you can experiment more easily....

Do whatever you like man!!!

Regards, Lefteris
GReece