I like the digital display.  Let's put a red LED on either side to indicate out of range system voltage.  Too low on left side. Too high on right side.  

I love procrastination.

Why use 2 more LEDs when you can use this? It happens to be one of the cheaper, thinner 7-segment display, too.



To use the microprocessor I was thinking of, a setup like this would be needed (idea and pic yoinked from this site):


The major difference is that he used an LCD display instead of a 7-segment display. The idea of using a shift register to minimize output use still holds. You go from 4 I/O ports to 2 for the display which would free up enough I/O to sense the battery level without a larger microcontroller. I have two concerns about this, though. First is resolution of the A/D converter. Since it's only 8 bits, will it be precise enough to do the battery thing? My second concern is what the display looks like when values change. It should be fast enough so that you wouldn't notice the bits shifting through, but who knows.

I'm just running with the PIC idea cause I started with it. I figure that the more ideas we start with, the better.

ok, really, think you're working the wrong braincells here, the GS450 already has the sensor, no digital anything, now the shift drum does run backwards so its a matter of reversing the wiring . its a 7 pole rotary switch, that run up to bulbs in the gauges where there are 6 sep holes for 6 sep bulbs for gears 1-6 and the separate green one for neutral.

now, it doesnt change resistances, its the same 12v for bulb, the drum switch if im not mistaken, is the grounding end. so dropping a resistor for one Keyed hotlead to feed all 6 LED's the  (neutral has its own, no need to change that) would keep it simple enough. If however you want a Numbered display, then you can do the homework for however you want to make it, but just using single LED's be it bar form, or 6 arranged around the perimeter of the tach or speedo. think i have a couple on my 450 engines. i will see if i can get out there on my days off to pull one.

Quote from: goatWhy use 2 more LEDs when you can use this? It happens to be one of the cheaper, thinner 7-segment display, too.

OK, I like that.  Use the left and right decimal points for low and high voltage warning lights.  Good call.    I wonder if they will be bright enough to see in daylight. :dunno:

Are you thinking of the Panasonic LN518?

Quote from: Blueknytok, really, think you're working the wrong braincells here, the GS450 already has the sensor, no digital anything, now the shift drum does run backwards so its a matter of reversing the wiring . its a 7 pole rotary switch, that run up to bulbs in the gauges where there are 6 sep holes for 6 sep bulbs for gears 1-6 and the separate green one for neutral.

now, it doesnt change resistances, its the same 12v for bulb, the drum switch if im not mistaken, is the grounding end. so dropping a resistor for one Keyed hotlead to feed all 6 LED's the  (neutral has its own, no need to change that) would keep it simple enough. If however you want a Numbered display, then you can do the homework for however you want to make it, but just using single LED's be it bar form, or 6 arranged around the perimeter of the tach or speedo. think i have a couple on my 450 engines. i will see if i can get out there on my days off to pull one.

If you can try one on for size that would be great.  This is no doubt the easiest way to do it.  For bulbs or LEDs.  For those who want a digital display, the addition of some diode logic arrays and a 7 segment display should be easy.

Quote from: Blueknytok, really, think your working the wrong braincells here,   the GS450 already has the sensor, no digital anything, now the shift drum does run backwards so its a matter of reversing the wireing.

I read your first post, but the implication didn't register. That would be a lot easier than what I was thinking

Quote from: John BatesI wonder if they will be bright enough to see in daylight. dunno

Are you thinking of the Panasonic LN518?

Thats actually a picture of a Lumex model. Here is some more info on them. They do have more than one brightness.

My GS400 had a digital one. It was just a single LCD clock display 8 and would show 1 2 3 4 5 6 upon shifting.

Here is a gear position indicator light made for the TL. It is compatible with the GSXR as well. There are pics of them running.
http://www.tlplanet.com/forums/showthread.php?s=&threadid=34632&perpage=20

Page 2 has the GPI Schematic

Quote from: dgyverHere is a gear position indicator light made for the TL. It is compatible with the GSXR as well. There are pics of them running.
http://www.tlplanet.com/forums/showthread.php?s=&threadid=34632&perpage=20

Page 2 has the GPI Schematic

Exactly what I have breadboarded on my work bench.  Same concept, slightly different implementation.  

Looks like Pedrodani has access to ckt board manufacturing with surface mount tech.  Big advantage.

I'm going to continue with my ckt.  I want digital display.

Does the GSXR switch also interchange with the earlier GS's?  (I'm up to something....don't want to jinx it yet).

I have an 89'.

Thx.

Quote from: Blueknytok, really, think you're working the wrong braincells here, the GS450 already has the sensor, no digital anything, now the shift drum does run backwards so its a matter of reversing the wiring . its a 7 pole rotary switch, that run up to bulbs in the gauges where there are 6 sep holes for 6 sep bulbs for gears 1-6 and the separate green one for neutral.

now, it doesnt change resistances, its the same 12v for bulb, the drum switch if im not mistaken, is the grounding end. so dropping a resistor for one Keyed hotlead to feed all 6 LED's the  (neutral has its own, no need to change that) would keep it simple enough. If however you want a Numbered display, then you can do the homework for however you want to make it, but just using single LED's be it bar form, or 6 arranged around the perimeter of the tach or speedo. think i have a couple on my 450 engines. i will see if i can get out there on my days off to pull one.

I agree..  My op-amp theory teacher always said "keep it simple stupid".  Does the 450 switch work in the GS-E engine?

so..is someone gonna build me one or what?  :lol:

i like the what the TLR have. Very nice.

Quote from: V8PintoDoes the GSXR switch also interchange with the earlier GS's?  (I'm up to something....don't want to jinx it yet).

I have an 89'.

Thx.

Yes , according to the microfich, it should fit all years of GS with the addition of the 1/8 in. (3 mm.) spacer.

Quote from: V8Pinto.......... Does the 450 switch work in the GS-E engine?

I don't know yet. I'll be getting one any day now.  It's supposed to be from an 82 GN125 which should be the same as the one on the 83 GS450.  Again, according to the microfich. :dunno:

the GS450 uses the same lower end as the 500. the shifter faces forward instead of the rear as is on th 500, the shift drum is reversed, but again, one would just wire in reverse order as it is a 7 position contact switch. 1N23456
the pin out would become something like this
6N54321  on the wires. wouldnt be hard to figure out. weather has been sucky as hell, and today was nice out but wife threw me into a honeydo list.  as soon as i can, i will grab it and use my little rinkydink 10$digicam to snap pix of it mounted, then of the contact side.

I just received a gear indicator switch that came from an 82 GN125.  According to the microfich it is part no. 37720-33200 which I understand is the same as 37720-45100.  Both of these part no's were apparently used in the early eightys GS450.

The switch is physically identical to the GS500 neutral switch.  No spacer needed like on the GSXR gear position switch.  Electrically it has the additional six gear position contacts, each with its own dedicated wire terminating into a six pin "molex" style connector.  The neutral contact has a separate wire terminating into a bullet connector.

It looks like it will mount and wire in as a direct replacement for the GS neutral sw. The additional six wires can then be used to furnish ground to six LEDs or a translation ckt for a digital display.

Looks like part one of the puzzle is solved.

Now we need a display design.  Either discreet LEDs or a digital readout.
Has anyone worked with LCD displays?  I think they would view better than LEDs in sunlight but I understand they are more complicated to implement.  Something about their inability to use DC.

I would like to incorporate two idiot lights to indicate when the system voltage is out of limits.  I have a ckt that uses 2 LEDs, 4 res., 2 zenar diodes and 1 transistor. It runs off of the system voltage so no power regulator etc.
If anyone can do it in fewer parts count, lets hear about it.

Quote from: werase643geeeeee
my 5speed indicator used 5 12V bulbs
and the gear indicator assy grounds a diff bulb in each gear
easy peasy japaneesy

and i might even add a 6th bulb....but no indication...would be 6th

10 days of work and back to square one....
KISS usually is better :mrgreen:  :mrgreen:  :mrgreen:  :mrgreen:  :mrgreen:

Quote from: werase643........................
KISS usually is better :mrgreen:  :mrgreen:  :mrgreen:  :mrgreen:  :mrgreen:

I agree, do you have a design worked up that you could share with us.  Something specific that you or someone else could prototype. :dunno:

Quote from: John BatesNow we need a display design.  Either discreet LEDs or a digital readout. Has anyone worked with LCD displays?  I think they would view better than LEDs in sunlight but I understand they are more complicated to implement.  Something about their inability to use DC.

LCDs work on DC (assuming we are both talking about the 2-line dot matrix LCD displays) are going to be a lot more work than LEDs. A lot more expensive, too. You would need some sort of display control That could be a microcontroller or some sort of display controller (If they exist for whatever model of LCD you are using).

A 7 segment display/LEDs can be done with some logic gates. Much simpler and less work IMHO.

I have worked with LCDs. 7 segment displays like the Lumex products at the top of this link still require some controller as they are usually multiplexed.

Older multimeters that have used these, and the one below, usually have the mux controller integrated into the meter chip, i.e. ICL7106 A/D LCD interface, ICL7107 A/D LED interface (though these examples are ancient and probably not recommeded for new design).

Jameco carries a 4 digit, 7 seg display here that I have also worked with. It is $15.

A single digit or two digit LCD unit will have to be hacked out of something or ordered from one of the display makers.

7 seg LED displays are readily available and can be stacked at will. The daylight issue previously mentioned is a drawback. I have several kinds available to the cause if anyone wishes to tinker with it.