Honda Steering Wheel Remote Question

OK, this is a not so newbie question from a very newbie to remotes type person. I posted the question of which signals are sent to the Honda Stereo from the remote and this was one of the answers I got back.


green/red at the radio harness is the steering wheel control. Just tie in there. Signals are resistors that get pulled to ground when a button is pressed. Factory resistors are:
100, 270, 620 and 3.6k (IIRC)
Take a look at this:
http://peripheralelectronics.com/images/products/peswi3%20revised%205_01.pdf

Video on navi conversion *NOTE: Tony should follow this link!*
http://www.odyclub.com/ubb/Forum4/HTML/000130.html


So the top link suggests, I think, that I should rewire the remote to the IR reciever then program the Empeg to recognize the ir commands for the remote. Is that right? If so, where would I mount the IR device? Or should I try to connect the wires from the remote to a plug ala the Sony Remote if the signals are the same? Or am I just missing the point all together?

The bottom link goes into detail on how to hook up a DVD player to output to the screen the Honda/Acura Navigation system uses. A very interesting read IMHO.

Greg

I don't see why you're discussing IR here? I thought the first one is talking about wired steering-wheel controls?

Looks a lot like the Sony Stalk arrangement, in fact. Wonder if it'd plug straight into the tuner module?

In reply to:

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Looks a lot like the Sony Stalk arrangement, in fact. Wonder if it'd plug straight into the tuner module?

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The principle is the same, but the values are very different. I calculated some values to adapt my (Peugeot) stalk, which has 4 switches to a common rail, to be usable with the empeg tuner:

http://empeg.comms.net/php/showthreaded.php?Cat=&Board=install&Number=43411&page=0&view=collapsed&sb=5&o=7

I don't see why you're discussing IR here? I thought the first one is talking about wired steering-wheel controls?

I was but then his response include the URL http://peripheralelectronics.com/images/products/peswi3%20revised%205_01.pdf which talks about connecting the remote to a converter which changes the signal to IR for interfacing with several different types of units. That's how I got confused becuase I would rather do this in a non-IR.

Looks a lot like the Sony Stalk arrangement, in fact. Wonder if it'd plug straight into the tuner module?

That's what I thought but the remote is wired to the wiring harness so you would need to splice the wires into the proper plug for the Sony Stalk then set the values to match the signals which seem to be very different from the Sony signals. I could be wrong tho and we would both have a plug and play solution

Greg

If you have access to your steering wheel remote's resistors and/or wiring to individual buttons, Toby's respons in this thread and this Sven's entry on riocar.org should be enough to improvise something similar to Toby's solution.

Okay, this "racerboy" shift knob was brought up a long while back by Jeff Wickiser... and it was mentioned that it could be interfaced via IR to the empeg.

Now that we have that tuner interface schematic... and looking at that shift knob.... what would it take to be able to plug it straight into the tuner to emulate the front panel buttons on the empeg???

It would never emulate the front panel buttons, it would only emulate a subset of the Sony stalk buttons (slightly different).

However, all that you would need is to know the resistor values of the Sony stalk and then assign each of the racerboy buttons to a given resistor value. Then it could wire directly into the tuner module.

I'm interested in these values, because I'm considering making my own "stealth" buttons to wire into the tuner module. They would be very small and be integrated with my car's existing steering-wheel controls. All I need is to find some very-low-clearance buttons. Anyone have any ideas on where I can find some?

Should the resistor values be published at the developer site somewhere?

Should the resistor values be published at the developer site somewhere?

They can be easily calculated from tables in this Sven's guide. I'll do that in few minutes and post it.

ahh... i was under the impression that there were commands... either in the Sony interface or in the serial connection... that would control the empeg as the front buttons do. But after checking out the Developer info again, i see there isn't... it's just FF/RW/volume etc.. Argh. So much for that. So i guess the next thing would be to wire it to an IR repeater or the like. Soo... what would THAT take?

(i plan on taking som electronics night classes around here soon so i can stop bothering you guys about this stuff=]) Thanks for the replies Tony.

All I need is to find some very-low-clearance buttons. Anyone have any ideas on where I can find some?

www.allelectronics.com

Do a search for "buttons"... there's quite a few mini-pc mount buttons that might work for ya.

Thanks, I'll check there.

Sorry for delay... Here are resistor values, finally (I hope I got them right):

cmd byte    R       R1      R2   button



3a   58    6477    5635    7372  back/front

af  175   48125   43233   53811  middle

9a  154   33545   30430   37053  front/back

2a   42    4338    3616    5101  att

5a   90   12000   10807   13283  back track

48   72    8656    7683    9695  fwd track

16   22    2077    1473    2714  source

84  132   23610   21488   25949  vol back

6e  110   16690   15152   18360  vol fwd

First two columns are command bytes (in hex and decimal), then ideal value of the resistor (in ohms), then minimal and maximal value that should still be recognised by 2.0 kernel (it is wise, of course, to use much smaller tolerances; 1.03 kernel is about three times more strict).

See my post for combinations of standard (E12) values for the functions I implemented. Mine were all series combinations; all the parallel combinations were further from the ideal values (or required more resistors).

If anyone wants to copy any text or diagram from the BBS to riocar.org, consider permission given.

I used your diagram as sanity check of my figures: volume up/down and track skip/back sounded reasonable .

Indeed, it would be a good idea to supplement Sven's article on Sony stalk on riocar.org with ideal resistor values, Toby's solution for 4-button remote and perhaps definition of E12 standard resistor series. Of course, if someone knows the whole Sony resistor network (or is able to reconstruct it), it would be perfect.

I've done a little more calculation, finding the following combinations:

Series

function	ideal	resistors	actual
vol+	16690	12K + 4K7	16700
vol-	23610	18K + 5K6	23600
track+	8656	8K2 + 470	8670
track-	12000	12K	12000
front/back	33545	33K + 560	33560
middle	48125	47K + 1K2	48200

Parallel

function	ideal	resistors	actual
source	2077	5K6, 3K3	2076
att	4338	56K, 4K7	4336
back/front	6477	18K, 10K	6429

I have the Gnumeric spreadsheet I used to calculate these if needed.

Note that I have only tested the four functions I needed, and that I've assumed 0% tolerances on the internal resistor and the sense circuit.

Sweet. I'll refer back to this when I wire up my custom buttons.

Question: The plug that goes into the Tuner module...

Is it a stereo 1/8" plug or a mono 1/8" plug? If it's stereo, what's the other conductor do?

The 3.5mm jack plug on the Sony stalk is a stereo one. I think it was Hugo (but can't find the thread) that said that the other (i.e. 'left') conductor is for the shift button. I don't have a Sony stalk to test this, though.

So which is the conductor with all the resistor buttons? Is that the tip or the middle sleeve?

I think the jack plug is arranged:

Tip ('right')

resistor sense

middle sleeve ('left')

shift sense

ring ('common')

ground

Can someone with a geniune Sony stalk to hand (Hugo?) confirm this, please?

That's correct.

Hugo