38 KHz IR xmtr
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From: lektric.dan on 22 May 2010 17:29 Why are there no one-chip 38KHz oscillators for remote control hobbiests? How much does the cheapest PIC cost? All one would need are 3 leads - power/ground/modulation-enable/output. Power driving could be left to the end user. I'm supprised no one makes these.
From: Tim Williams on 22 May 2010 17:54 Interesting question. Remote controls are all based on microcontrollers (possibly 4 bit, mask programmed), so they don't need it. Since this is true of the general marketplace, I guess that might answer your question. You can make your own from a 555, R and C, so it's not hard otherwise. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms <lektric.dan(a)gmail.com> wrote in message news:3cf8c49d-0ed1-4658-a068-3961355dd1d1(a)k31g2000vbu.googlegroups.com... > Why are there no one-chip 38KHz oscillators for remote control > hobbiests? How much does the cheapest PIC cost? All one would need > are 3 leads - power/ground/modulation-enable/output. Power driving > could be left to the end user. I'm supprised no one makes these.
From: David Eather on 22 May 2010 18:38 On 23/05/2010 7:29 AM, lektric.dan(a)gmail.com wrote: > Why are there no one-chip 38KHz oscillators for remote control > hobbiests? How much does the cheapest PIC cost? All one would need > are 3 leads - power/ground/modulation-enable/output. Power driving > could be left to the end user. I'm supprised no one makes these. Have a look at this - page 94 and 95 might be of interest http://www.rev-ed.co.uk/docs/picaxe_manual2.pdf
From: lektric.dan on 23 May 2010 03:20 On May 22, 4:54 pm, "Tim Williams" <tmoran...(a)charter.net> wrote: > Interesting question. > > Remote controls are all based on microcontrollers (possibly 4 bit, mask > programmed), so they don't need it. Well, yeah, but these aren't used by hobbiests either. That's what I'm thinking of. > Since this is true of the general > marketplace, I guess that might answer your question. No, not really. How big is the hobbiest market? Since no one's actually *bothered* to make one of these purpose-specific chips, it's hard to say what the penetration into the commercial market would be as well. > You can make your own from a 555, R and C, so it's not hard otherwise. > But I thought that's what the whole idea behind the PIC was. Now you want me to create an analog device using about six (or so) discrete parts when one digital part would do it? I specificly remember Don Lancaster writing in one of his columns years back about how he would never use a 555 again. Well, Don, am I right? Is this the equivalent of a 3-pin regulator, or just wishful thinking? (and you can be an extremely harsh but extremely realistic critic)
From: lektric.dan on 23 May 2010 03:30
On May 22, 5:38 pm, David Eather <eat...(a)tpg.com.au> wrote: > On 23/05/2010 7:29 AM, lektric....(a)gmail.com wrote: > > > Why are there no one-chip 38KHz oscillators for remote control > > hobbiests? How much does the cheapest PIC cost? All one would need > > are 3 leads - power/ground/modulation-enable/output. Power driving > > could be left to the end user. I'm supprised no one makes these. > > Have a look at this - page 94 and 95 might be of interest > > http://www.rev-ed.co.uk/docs/picaxe_manual2.pdf That's a little beyond what I was looking for, but nice to know. I wasn't looking for commands, just the modulation of the signal. In playing around with photodetector circuits recently, it would have been really nice to be able to use the IR modulation detectors available instead of just a simple phototransister. Although there's no actual data going over the beam, its a lot easier to pick out of the background. |