After extensive usage, my batterypowered does around 4hours (a rechargeble 9v "square" battery), and I got mine configed like this:
R Y Y
___
| |
|___|
| |
|___|
G
Where R is a red LED - Y is a yellow one, and G a green one.
Red is my shift light, middle yellow is my "over the redline" light and the right yellow is 3% fuel light.
Green led is Traction Control
BUT after a long time using, I realized I only really used the shift light and the fuel light.
So Im thinking of making one with no 7-seg display. Just a lot of leds.
Problem is, with only 5 leds to use, Im running out of them quickly
I wanted a 6-led array for the rev/shift lights (Green Green Yellow YellowYellow RedShiftLight), and a 7th for the fuel light, and maybe a 8th for the engine-not-running light.
Now, the idea would be to use the main pins for this. I KNOW I can do it, via changing code/figuring out what binary number to send to LPT port to turn on one of the lights, one by one.
But... Im very busy (College, 2 kids, 2 cats, 1 dog, 1 wife...) so I'll be requesting some help
One bug I've had (no bug, actually) is that sometimes when using the rpm1 rpm2 rpm3.... the shift light lit up BEFORE all the rpm lights were on - specially in some cars.
This depends on the gearing on the setup - which makes the shift point being closer/farther away from the rev limiter.
So far, my solution is this:
G G Y Y R R R Y Y G G <-----LED array
Where the 2 Outside Green leds are all tied to the rpm5, the 2 outside Greens on rmp4, the 2 outside Yellows on rpm3, the 2 inside yellows on rpm2, and all the red lights on Shift Light.
(I wont use the rpm2 and rpm1 trigger cause sometimes shift light lights up before it). Superbrights on the red leds (so its the "Shift, goddamnit" kind of indicator), and one low power blue led somewhere for fuel.
If I make this thin enough, I can stick it on top of my g25, so I see it just behind the wheel.
But I only got 3 rpm levels - Id like 5 rpm levels, shift light, and fuel light. - This via making one of the triggers send a number to the main data pins that would light up one of the lights.