Gear indicator

[Crazy]

I know there are gear indicators on teh market for around $100... but I'm an ECE major (actually computer eng), and it seems like a lot of money for something that is probably a very simple circuit. so I'm kinda curious if anyone knows any info about the speed/rpm/other signals that go to the dashboard... I guess I could just hook up my bike to an oscilloscope??

not that I really need one, just would be a fun project.

[Trip]

From what I have read, the fancy ones use the tach and speedo to calculate gear. That would be more chip programming than I would care to get into and the cost to get the software and hardware to do this would warrant the $100 to buy one. If you planned to sell them, then it could possibly be worth it.

[Crazy]

yeah thats what i've found so far, but its kinda hard to mount an oscilloscope to your bike and ride around to figure out the details of the signal...

true its probably not worth doing money and effort wise but if i can do it for anything less than $150 i would do it, most of them are priced from 100- 150 and up. I probably have more free time than you

and i've done some basic microcontroller programming before , but really need to know the signal details first.

[Amber Lamps]

Originally Posted by Crazy

yeah thats what i've found so far, but its kinda hard to mount an oscilloscope to your bike and ride around to figure out the details of the signal...

true its probably not worth doing money and effort wise but if i can do it for anything less than $150 i would do it, most of them are priced from 100- 150 and up. I probably have more free time than you

and i've done some basic microcontroller programming before , but really need to know the signal details first.

Well,if you know a friendly dyno owner...... or if you're REALLY,REALLY smart you could crack the programming in the computer since most,if not all FI bikes send that info to the bikes computer along with throttle position, o2 info, rpm, speed,etc.

[Crazy]

good point tigger, actually just searching around, it looks like there is a gear position sensor which gives different resistances to the ECU. tap the wire and then use a circuit like this:

http://www.bluegauges.com/gpi_stuff/gpi_schematic.gif

so then you'd have an led counter, 1 led on for 1st gear, 2 on for 2nd etc.

I think that would work...

I should probably invest in a manual for my bike first heh

[No Worries]

My 75 Suzuki GT550 and 76 GT750 had digital gear indicators. No idea how they worked, but they were definitely kool. Could probably find them in a junk yard, but they were five-speeds.

[Trip]

Originally Posted by Crazy

good point tigger, actually just searching around, it looks like there is a gear position sensor which gives different resistances to the ECU. tap the wire and then use a circuit like this:

http://www.bluegauges.com/gpi_stuff/gpi_schematic.gif

so then you'd have an led counter, 1 led on for 1st gear, 2 on for 2nd etc.

I think that would work...

I should probably invest in a manual for my bike first heh

Hell that site is everything you need, it's already setup for suzukis