Dallas Semiconduction one-wire support

I have many intertwined ideas for this. The simplest one would be to have a reader that you press a key fob ibutton to and the empeg could then identify you. It could be tied to wendy filters, playlists, volume, etc. I think that there is some support for one-wire built into the empeg. I read something about the built in temp sensor is a one-wire ds1820 chip.

I should point out this is total vapor at the moment. I have worked with one-wire chips and weather stations under linux, but I haven't yet sucessfully built an empeg kernel. You can read about one-wire/ibuttions at www.ibutton.com.

other ideas I have:

tie it to the ignition system. so no ibutton or no empeg, and no car start.
have it linked to my NO system so only people with authorised ibuttons can use the nitrous.

Yeah, one of Hugo's earliest ideas for the Wendy filter was to have some kind of gadget literally detect when Wendy was in the car, and send a command to the player's serial port to activate that particular Wendy filter. Never got implemented, but hey, anything is possible.

Sounds good to me... I've built an empeg kernel but never gotten to play with iButtons. I've wanted to ever since I first read the web page on them, however. There's always the microphone input on the docking connector which is looking like it will never be used. If there's already a one-wire interface on the empeg, is there any chance that we can get to it? Otherwise, a serial converter appears to cost $5 and wouldn't void the waranty. I'd love to have an interior/exterior thermometer display, which would also be possible. I don't share my car, so ID isn't too important for me...

Matthew

I would like the thermometer too.

Hmm, Dallas One Wire interface - sounds like something Patrick could possibly add to his new Tuner while its still in early production.

Such a interface could be used for all sorts of things, and as the car already docks to the tuner when its in the car theres no need to hack the sled or open your empeg to borrow the mic input wires for a One Wire interface.

This could be used for external temperature sensors - which some folks here have expressed a real interest in.

I'm sure the Tuner/Empeg protocol is flexible enough to accomodate a 1 wire interface to developers in the empeg.

It sounds like the most interest is temperature. I have a spare serial port adapter, so no need for me to void the warranty... ...yet. I did some searches on this bbs (search is everybody's friend) and the internal temp probe is a one-wire chip. It is a surface mount device, so I am not excited about tacking some wires on it to extend the bus. (but someone on this bbs did, to replace a faulty chip). I also found some scripts that download all the tools and code and compile the kernel for you, so now it is up to me to see if I have enough of a clue to make this work.

I use ds1820's to monitor temps around my house and in computers etc. The linux s/w I use is from http://www.brianlane.com and is free with source code. It just requires a ds9097u or ds9097s serial adaptor which plugs into the serial port.

I might try and get ths working at the weekend with my 10 exsitng sensors (at least from the command line).

I've just setup something like that at my place. I've got two sensor in place, and planning on getting some more in. I'm using that software, but I'm hacking on the perl scripts that do the image creation since the computer that has the sensors attached to it is not the main server.

For those interested here's the link to the graph http://home.konosky.org/images/temp.png

Does this post help?

single wire input

For those interested in expanding the memory of the empeg:

Is it possible to interface the ibutton memory modules http://www.ibutton.com./products/ibuttons.html#memory
with the mute or headlight dimmer wire?

Just thought I'd put it out there for anyone interested.

Don't see why not. But the only thing is that the iButton's don't store very much. I guess you could use it instead of flash for settings tho...

- Trevor