joe@mojave.UUCP (Joe Talbot) (01/20/89)
I'm working on a project involving DAT machines (which are wonderful) that requires control of the machines by a computer (for broadcast automation). The only control external to the machine is an IR handheld control. I need to emulate the signal that unit creates and interface it to my project. I opened the unit and found an NEC controller IC and called NEC who sent me the data sheets. I was disapointed to find that it was a microcontroller with on-board screened ROM full of sony code to make it run. I have to beleive that there are dumb chips out there that could do the same thing, or perhaps some alternative. It would be useful to control many "consumer" products that use infra-red remotes. I'm having difficulty finding where to get started. If any of you know of any app-notes or primers on this type of thing, please let me know. Joe Talbot apple!zygot!mojave!joe -- joe@mojave "I really hate my dumb job." "People are always telling me what a great (gag!) voice I have."
bill@videovax.tv.Tek.com (William K. McFadden) (01/25/89)
In article <141@mojave.UUCP> joe@mojave.UUCP (Joe Talbot) writes: >I'm working on a project involving DAT machines (which are wonderful) >that requires control of the machines by a computer (for broadcast >automation). The only control external to the machine is an IR handheld >control. I need to emulate the signal that unit creates and interface >it to my project. You could always get one of those universal remote controls and teach it the codes you need. Then wire your control circuit to the remote. Radio Shack sells a cheap one for $50. Or you could do what I did: wire a relay across the switch contacts in the player. It's really cheap and it works. I use this to start CD players from my board. Good luck! -- Bill McFadden Tektronix, Inc. P.O. Box 500 MS 58-639 Beaverton, OR 97077 UUCP: bill@videovax.Tek.COM, {hplabs,uw-beaver,decvax}!tektronix!videovax!bill GTE: (503) 627-6920 Silliest new cartoon title: Teenage Mutant Ninja Turtles
joe@mojave.UUCP (Joe Talbot) (01/26/89)
I'm looking for a "non-hacked" solution on my DAT project. I appreciate your responses to my question. My current version is, as you suggest, a remote interfaced to the outside world. I couldn't ever make very many of these and am VERY embarrassed when somebody into electronics sees this. There MUST be a real solution. Nobody knows of any chipsets or articles on IR remote controls? -- joe@mojave "I really hate my dumb job." "People are always telling me what a great (gag!) voice I have."
commgrp@silver.bacs.indiana.edu (01/27/89)
>I'm looking for a "non-hacked" solution on my DAT project. I >appreciate your responses to my question. My current version is, >as you suggest, a remote interfaced to the outside world. I >couldn't ever make very many of these... >-- >joe@mojave (e-mail wouldn't go) Radio Shack sells an IR remote control that can "clone" several such devices so that if you have multiple IR-controlled devices, you only need one "God stick." I think it is programmed directly by the other controllers via its own IR receiver. Byte magazine published details of a similar device a few years ago in "Ciarcia's Circuit Cellar." Can't provide exact reference. -- Frank reid@gold.bacs.indiana.edu
kevinro@microsoft.UUCP (Kevin Ross) (01/28/89)
This months issue (Feb 1989) of Modern Electronics has an article about the Sharp GP1U52X IR module. Might be worth looking at.
munir@hpfcmr.HP.COM (Munir Mallal) (01/29/89)
/ hpfcmr:sci.electronics / bill@videovax.tv.Tek.com (William K. McFadden) / 6:00 pm Jan 24, 1989 / In article <141@mojave.UUCP> joe@mojave.UUCP (Joe Talbot) writes: >I'm working on a project involving DAT machines (which are wonderful) >that requires control of the machines by a computer (for broadcast >automation). The only control external to the machine is an IR handheld >control. I need to emulate the signal that unit creates and interface >it to my project. There was an article in Byte some time back describing just this, written by Steve Ciarcia. Look in the back issues of look for his book which is a collection of his articles. Also, he has since left Byte and is now publishing Circuit Celler Ink.
zeeff@b-tech.ann-arbor.mi.us (Jon Zeeff) (02/03/89)
>>I'm working on a project involving DAT machines (which are wonderful) >>that requires control of the machines by a computer (for broadcast >>automation). The only control external to the machine is an IR handheld >>control. I need to emulate the signal that unit creates and interface What we really need is a IR control with a serial port (instead of buttons) for input. -- Jon Zeeff zeeff@b-tech.ann-arbor.mi.us Ann Arbor, MI mailrus!b-tech!zeeff
rick@ofa123.FIDONET.ORG (Rick Ellis) (04/07/90)
That will only work if the remote uses somewhere near 40kHz for it's carrier
frequency. (It's also dependent on how picky the receiver is.)
--
Rick Ellis
...!{dhw68k,zardoz,lawnet,conexch}!ofa123!rick rick@ofa123.FIDONET.ORG
714 544-0934 2400/1200/300mjw06513@uxa.cso.uiuc.edu (Mary Winters) (04/09/90)
In article <102.261CF0A4@ofa123.FIDONET.ORG> rick@ofa123.FIDONET.ORG (Rick Ellis) writes: > >That will only work if the remote uses somewhere near 40kHz for it's carrier >frequency. (It's also dependent on how picky the receiver is.) I've been experimenting with IR control of VCRs, and the Radio Shack IR detector module in particular. The detector module is made by Sharp, so it's fairly safe to assume that at least some Sharp products use 40kHz. The detector also properly decodes signals from my Sony and JVC remotes. Also, according to Steve Ciarcia in a Circuit Cellar article, most IR remotes have carrier frequencies between 32 and 48kHz, and he presents a circuit which will detect across that range. In my experiments with my Sony deck, the detection circuitry appears to have a fairly high tolerance (around 10%). I suspect most decks have fairly wide tolerances to accomodate for poor aim, weak batteries, and other adverse working conditions in the home environment. For a few $ in parts from the Shack, you can find out if your remote uses a 40kHz carrier (and it's a lot of fun finding out). -- uv@f69.n233.z1.fidonet.org Suffering from PMS (Presentation Manager Syndrome)
ssy@sage.cc.purdue.edu (Kyler Laird) (04/09/90)
In article <102.261CF0A4@ofa123.FIDONET.ORG> rick@ofa123.FIDONET.ORG (Rick Ellis) writes: > >That will only work if the remote uses somewhere near 40kHz for it's carrier >frequency. (It's also dependent on how picky the receiver is.) Very true. Fortunately all the remotes I've tested do. I think that this is fairly universal. --kyler
mjw06513@uxa.cso.uiuc.edu (Mary Winters) (04/10/90)
>>That will only work if the remote uses somewhere near 40kHz for it's carrier >>frequency. > >Very true. Fortunately all the remotes I've tested do. I think that this is >fairly universal. Now, the obvious followup question: How do I construct a simple 40kHz IR LED flasher which I can turn on and off with a TTL signal (such as a parallel output line from a computer)? Yes, I admit it, I'm a total novice WRT the hardware aspects of electronics. If someone has a schematic for a working carrier generator of this sort, I'd be very appreciative if you could send it to me (in what format to send it is another good question, but I'll save that one for later (-:) Thanks! -Yet Another Hardware Hacker WannaBe. -- uv@f69.n233.z1.fidonet.org Suffering from PMS (Presentation Manager Syndrome)
dclaar@hpcupt1.HP.COM (Doug Claar) (04/11/90)
Now, the obvious followup question: How do I construct a simple 40kHz IR LED
flasher which I can turn on and off with a TTL signal (such as a parallel
output line from a computer)? Yes, I admit it, I'm a total novice WRT the
-Yet Another Hardware Hacker WannaBe.
----------
Well, if you know of a sci.electronics archive, you can look for: "powering
50ma LED from TTL logic?" which is the notes string that I started to ask
the same thing. As I noted in the basenote, the ugly way is to find a
digital device that sinks enough current, and use it. The AS640 worked
for me: it sinks 64ma, and inverts, so that high=on: TTL can sink 'lots'
of current, but not source it. This means that you have to hook up the
LED 'backwards' in that when the output is high, the LED is off.
Since the inverter output is high when the input is low, it works out
that low = LED off.
diode resistor ground
+----+
| | | /|
|'640|o-------|< |---/\/\/\/\/\---+
| | | \| |
+----+ -----
---
-
Of course, this is really gross, and the transistor methods in the
response are much more elegant, but it worked for the prototype.dclaar@hpcupt1.HP.COM (Doug Claar) (04/12/90)
> diode resistor ground >+----+ >| | | /| >|'640|o-------|< |---/\/\/\/\/\---+ >| | | \| | >+----+ ----- > --- > - >Of course, this is really gross... > ======================================= Yeah, EXTREMELY GROSS, since it is wrong. (Thanks Neal, for pointing this out--and without flaming, too!). Let's try: diode resistor VCC (+5v) +----+ o | | | /| | |'640|o-------|< |---/\/\/\/\/\---+ | | | \| +----+ This is STILL really gross, but it should at least work... BLUSH! --Doug "Free advice is worth every penny you pay" Claar