Ideas for remote control of DVD players...????

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andyf:

--- Quote from: John Hill on November 16, 2011, 02:18:01 AM ---
I am really liking the idea of an IR flood light up high that they can all 'see' but I havent determined what sort of light would be required and how I could 'key' it.

John

--- End quote ---

Maybe you could use one of the existing remotes to key an infra-red floodlight by removing the led from it and using its connections to drive an amplifier of some sort, then take the amplified signal up to the floodlight via a cable.

Andy

picclock:
Rather than using a communication method to start play, you could possibly just connect a timer chip to pulse the play button after a few seconds from power on. Basically this would set play a few seconds after mains power is applied. Power for the circuit could easily be derived from the internal DVD player power supply.

This should be possible using very low cost components, and should also be fast and simple to install.

Best Regards

picclock

John Hill:

--- Quote from: David Jupp on November 16, 2011, 03:31:53 AM ---The IR that the player is looking for may not be just pulsed - I am told by a usually reliable source that the IR is typcially modulated at a moderately high frequency too. Filters in the receiver separate out that frequency, making the system more sensitive and immune to interference form other IR sources.

Must be a common frequency used by most makers though as 'universal remote controls' are quite common.

--- End quote ---

He he, I have learned a lot today, I learned that the data modulates a 38khz carrier. Thats makes it impossible to modulate a filament type lamp though it would not be too hard to put a chopper disk on a mains synchronous motor to chop the light from a QH lamp, that would certainly get the 38khz infra red to flood the display space.

John Hill:

--- Quote from: picclock on November 16, 2011, 03:46:07 AM ---Rather than using a communication method to start play, you could possibly just connect a timer chip to pulse the play button after a few seconds from power on. Basically this would set play a few seconds after mains power is applied. Power for the circuit could easily be derived from the internal DVD player power supply.

This should be possible using very low cost components, and should also be fast and simple to install.

Best Regards

picclock

--- End quote ---

Good idea but it is a bit more tricky than that, we need the play button then select the chapter required then set the repeat, but it is still worth thinking about, thanks.

BillTodd:

--- Quote from: John Hill ---He he, I have learned a lot today, I learned that the data modulates a 38khz carrier. Thats makes it impossible to modulate a filament type lamp though it would not be too hard to put a chopper disk on a mains synchronous motor to chop the light from a QH lamp, that would certainly get the 38khz infra red to flood the display space.

--- End quote ---

John,

It's along time since I played with IR remote devices !

There are a few different carrier frequencies in common use usually between 35- 40kHz

You would need to use IR LEDs for the flood light, not difficult or too expensive, but you may need quite a few LEDs if it's a big hanger! It might even be possible to construct the unit as a passive repeater by using a different carrier frequency to send commands to the unit (would save a lot of wiring)

However, if you are going to have to send several common (e.g. 'chapter', '1', 'play') commands the main problem would be maintaining synchronisation between players; i.e. if one took too long to change to 'chapter 1' it might miss the 'play' signal or - nightmare scenario - the units have a play/pause button, 'cos you just know one will get out of sync.

If you need to send different chapter select commands to different machines, it just not going to work ( Although, Sony machines often have a selectable device number so multiple players can be addressed)

It may seem a silly question, but have you checked that the DVD machines don't have a auto-start/play function? It used to be a common feature on VCRs & cassette players for exhibition use.

Bill

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