active tach/speedo idea...help me with this
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not as easy as it sounds
one. how exactly do you tell the display which gear you are in (i know the answer but I want to know if YOU know the answer)? Without an answer to that you are dead in the water.
one. how exactly do you tell the display which gear you are in (i know the answer but I want to know if YOU know the answer)? Without an answer to that you are dead in the water.
figgie said:
a correlation between engine RPM and vehicle speed. these two variables can only correspond to one gear in a given "window" of values per gear.
neutral would be a little different and would have to check a few different conditions.
maybe there is an easier way? but this is the only way i can think of doing it without ADDING anything else to the car.
programming this would be simple, even with the different SPEED scaling. its the hardware implementation id have to learn a little more about.
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lagged said:
sorry no
see the issue then becomes that the rpm window has to ALWAYS be the same. Otherwise you CAN be going 45 in fifth OR fourth. 40 in Fifth, fourth or third.
here is a hint. Strain.....
figgie said:sorry no
see the issue then becomes that the rpm window has to ALWAYS be the same. Otherwise you CAN be going 45 in fifth OR fourth. 40 in Fifth, fourth or third.
here is a hint. Strain.....
yeah but 45 in fifth is at X RPMs and 45 in fourth is at Y RPMs. like i said before, you have to moniter speed and rpms.
lagged said:
Remember you'd have to tell it when the car is/is not in gear..or whether the clutch is slipping, because you can do whatever speed you want and still be doing 700 rpm.
If you put a switch on the clutch and maybe some sort of sensor? on the shifter with magnetic pickups in the notches..you could figure out what gear you are in that way.
lagged said:
nah
K.I.S.S.
just directly monitor where the "stick" is at.
Mrbaboon said:
exactly what a STRAIN gage does
like i said earlier, youd also have to determine when the car is in "neutral" or the clutch is in. trivial however.
the method i described would work. like i also said earlier, doing it that way keeps you from having to install extra sensors in the car. take two wires from the engine harness, and however else you want to hook up the LED assembly and youre done.
its easy enough to do.
the method i described would work. like i also said earlier, doing it that way keeps you from having to install extra sensors in the car. take two wires from the engine harness, and however else you want to hook up the LED assembly and youre done.
its easy enough to do.
figgie said:nah
K.I.S.S.
just directly monitor where the "stick" is at.
exactly what a STRAIN gage does
instead of saying "BZZZT WRONG" (paraphrased
), what you should have said was, " i think this method would be better..."and for the record, i think my method is better
.instead of having to mount/install 6 sensors, you can have software do all that by means of simple calculations.
youre gonna end up having to program an EEPROM or some other embedded system to get this thing to work well so why not reduce the amount of hardware youre going to have to use?
youre keeping the install process down to a minimum (more desireable for customers huh?)
1. install speedometer overlay? or however you want to implement it.
2. connect to black box housing your electronics.
3. connect to power, the RPM signal and SPEED signal
4. FINISHED!
lagged said:instead of saying "BZZZT WRONG" (paraphrased
and for the record, i think my method is better
instead of having to mount/install 6 sensors, you can have software do all that by means of simple calculations.
youre gonna end up having to program an EEPROM or some other embedded system to get this thing to work well so why not reduce the amount of hardware youre going to have to use?
now what fun would that be
as for 6 sensors, where did you get that number?
You only need ONE strain gage sensor on the gear shift lever. That is it
figgie said:now what fun would that be
as for 6 sensors, where did you get that number?
You only need ONE strain gage sensor on the gear shift lever. That is it
well, IMO we have TWO opportunities to use the KISS guidline:
1. keep it simple for developers
OR
2. keep it simple for customers/installers
which one do you think is going to make the product more successful in the long run?
ease of install is a biggg factor that you cant deny!
lagged said:well, IMO we have TWO opportunities to use the KISS guidline:
1. keep it simple for developers
OR
2. keep it simple for customers/installers
which one do you think is going to make the product more successful in the long run?
ease of install is a biggg factor that you cant deny!
I forgot to mention. The K.I.S.S was not directed at anyone especially you. I should have prefaced it with, "I believe in the K.I.S.S. prinicple".
for me i don't care.. this is way to much work already. Programming, Dynamic LCD/OLED.. meh
For display purposes, I would get something like
Bosch DDU-4 Display
or
Motec ADL2
and be done with it
for selling. Way to much programming altering, installing to work. You are already installing a custom LCD and the programming/wiring assoicated with it. One strain gage will not make it any more complicated.
btw the Bosch DDU-4 does allow for dynamic display of RPM based on inputs
this is where the strain gage comes in handy
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figgie said:I forgot to mention. The K.I.S.S was not directed at anyone especially you. I should have prefaced it with, "I believe in the K.I.S.S. prinicple".
for me i don't care.. this is way to much work already. Programming, Dynamic LCD/OLED.. meh
For display purposes, I would get something like
Bosch DDU-4 Display
or
Motec ADL2
and be done with it
for selling. Way to much programming altering, installing to work. You are already installing a custom LCD and the programming/wiring assoicated with it. One strain gage will not make it any more complicated.
btw the Bosch DDU-4 does allow for dynamic display of RPM based on inputs
well, ive always been one to reinvent the wheel.
what happens if u were doing 50 in fourth and u pushed the clutch in and the rpm went to 700rpm but still doing 40 in 4th gear with the clutch down? it would prolyl be easier to use a tach with 5 difrent lines across it and 1-5 on either side of the lines. have the speed for that rpm in that gear on that line so u can just look at ur rpm and kno what gear would be best. kinda like a cross refrence. but then again who looks at the speedo besides when cops are around lol
nosechunks said:
totally off topic
but I do
there are two ways too speed. The stupid way and the "minimize the chance of getting caught" way.
I speed and has been a bit over 5 years since I last got "caught". I usually keep it under 10 mph over the limit as most cops don't care. Go 11-15 and you are royal fucked.
Here in Australia they've decided that there is a 3% allowance for speed then you can be booked even though the ADR (Australian Design Rule) for speedo's is 7%!
This has the effect that now if I'm doing 103 kph in a 100 zone I feel like a criminal and spend more time monitoring speed than traffic and I'm sure this causes accidents as everyone else is doing the same....
This has the effect that now if I'm doing 103 kph in a 100 zone I feel like a criminal and spend more time monitoring speed than traffic and I'm sure this causes accidents as everyone else is doing the same....
A buddy of mine always said that speed limits shouldnt apply to Supra's and if the do, they should be double the limit for everyone else :icon_bigg
You guys are making it toooo complicated....
Buy this:
http://www.gear-indicator.com/
No need to program and build your own eprom. Just biuld your led sections on the tach and mph to light up with the corrsponding gear output....
Easy as 1-2-3 and 4 :bigthumb:
Buy this:
http://www.gear-indicator.com/
No need to program and build your own eprom. Just biuld your led sections on the tach and mph to light up with the corrsponding gear output....
Easy as 1-2-3 and 4 :bigthumb:
there would be a need to reprogram becaust it is built for a bikes rpm range/speed. and you would need to hack up and extend their wiring harness to make it work with the supra.
