2 vital functions only via missing remote control, not available to buy or borrow, to copy/learn from or to make a simple 2 function r/c. The other functions are setup menus that have no need to be on a remote.
7 data lines to 3x4 ,12 switch matrix on the unit and no odd spare lines. Large proprietory BGA controller does the decoding so totally hidden, no separate IR decoder available to monitor. Tried 5 "universal" zappers in quick search but no change from on to standby. Any ideas for at least cracking the ident/start code ? Is it always the case that this ident code repeated after a gap is always the code for on to standby operation? Any off-the-wall suggestions for consideration? eg 2 fans/ motorised vanes at variable analogue voltages interrupting pulsed beam of order 20 to 40 microsec repeat rate
I'll offer one that I would like the IR control codes for:
Singing Machines SMG-301 Karaoke box - 3CD elderly device belonging to our village hall. Seems to be obsolete, but kit itself still works OK. The remote unfortunately does not exist any more...
It is known to be incompatible with generic IR controllers and a selection of randomly chosen CD controllers. The original controller has vanished so no chance of repairing it.
If anyone would be kind enough to specify the control code sequences it sends for each of the keys I could easily program a PIC to send them. Thanks. Just the numbers and play buttons would do...
The only suggestion I have is go into Google/images and try and find another make+model that looks like a rebadged version of your one, then hunt for a replacement on that make and model
-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on
If you can find a lookalike make/model on google images then it's worth looking on
formatting link
to see if anyone has made a config file for the philips pronto touchscreen remotes for that device and on the site for the company that makes the 'oneforall' brand remotes
formatting link
to see if there's a setup code for your device on a recent model of their universal remotes.
If either of these sites has a downloadable config with your device supported then the raw codes can be exctracted from the config without needing access to the correct universal remote and maybe allow you to create that pic based remote (or maybe find someone to loan you the correct remote for the config or one that can already operate your CD player and let you copy all keys into a cheap learning remote).
Unfortunately remotes are complex devices - there are at least 20 different protocols used (philips have 2, NEC have at least 2, Toshiba have a couple, Sony have another couple, etc, all with multibit device number and button codes making it almost impossible to guess correct code to send, and an unknown brand chinese player could have used any one of them) so emulating one with a PIC chip isn't as easy as you would expect.
I always wondered how the mute works? I'd like to be able to universally mute any TV (usefull). Now the question is whether there are two different signals for mute on and mute off or is it just a Flip/Flop kind of thing.
In every case I know, MUTE is treated just like any other button on the remote. The remote usually transmits an IR packet which (when decoded) says "Device ID NNN, button MMM has been pressed".
It's up to the IR receiver logic, and the microcontroller in the TV, to decode the modulated IR burst, pull out the device ID and "realize" that the ID is that of the TV set, pull out the button ID and "realize" that this means "mute", and do whatever is necessary.
Unless your remote control is capable of firing a 50-calibre plastic slug through through the TV screen, that's not going to happen :-)
Every manufacturer can choose its own IR-modulation schema and command packet format (although there are a few very popular variants), device IDs, and button IDs. There is no universal standard.
Almost always a flip-flop, just like the POWER button. The remote control doesn't have any way of knowing whether the TV is on or off, muted or unmuted, etc.
In some remote-control dialects, there are different variants of some command codes (I think they're called "discrete" codes but I may be misremebering). For instance, the POWER code is used by the normal power-on/off pushbutton on the remote, and is a toggle... and there are separate POWER ON and POWER OFF codes as well. The POWER ON code would turn on the power if it's off, and would have no effect if the TV is already on.
These discrete codes usually aren't programmed directly to a pushbutton on the remote. Rather, they're used when composing a complex "macro" sequence of commands, on a programmable remote. One might set up a special-purpose button which means "Turn on the TV if it's off, turn on the DVD player if it's off, select the DVD input on the TV, dim the room lights to 50%, wait 10 seconds, send a PLAY command to the DVD player." Using a discrete-ON (e.g.) command ensures that the sequence will work correctly regardless of whether the device is on or off.
I've never seen a remote which has discrete MUTE and UNMUTE commands... it's always been a toggle. Some devices may support this, but I haven't run into one myself as far as I know.
--
Dave Platt AE6EO
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I seem to remember one of those gadget shps had a wrist watch that had an IR random pulse stream mode. So you could sit in front of a TV and every now and then TV would change channels or misbehave.
-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on
If the original unit still existed that would be handy. I might yet be able to find someone locally with an SMG-301 and clone the controller.
I thought that might be a problem. I wonder why SMG made their remote deliberately incompatible with generic universal remote controls? (it even says this in the manual which I have now found - unhelpful)
Thanks everyone for the various suggestions. I haven't been able to find a codebase for the SMG-301 but I have found some new places to look!
I found the manual for my Tevion URCT 48B "universal"/learning r/c.
4 codes for Singer DVD units scoping , without digging out a storage scope, just shows the same background code of 105mS cycle repeat, 8.5mS block, space, 0.6mS block, carrier 25uS, the non-repeated coding bursts are not triggerable.
-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on
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