Digital Tach

wanarace94 · April 1st, 2014, 07:57 PM

I have a different sort of idea for a digital tach. I want to take an arduino and make a digital tach with a shift light for the 250. I am in the preliminary design phases right now trying to create a schematic. I have run into a few questions that I'm hoping people will have answers for.

1. I thought I read the new gen tach was powered by a cable. So a adapter would have to be created. Or is there a wire that has the rpm being run through it? I have not looked at the wiring yet on my bike.
2. What voltage is put out at the stator?

I am sure I will have more questions as time go on but this is it for now.

Thanks!

Kevin

Alex · April 1st, 2014, 08:16 PM

The pre-gen and new-gen speedos are run by a mechanical cable to the front wheel. But I thought that the tach was electronic on all generations of the bike.

SuperAmp13 · April 2nd, 2014, 07:27 AM

The new gen tach rpms are run through a wire in the 9 pin harness. I want to say it is black in color, but i could be very wrong.

If you look up a wiring diagram it will tell you exactly what color it is. The only cable driven guage is the speedo.

NevadaWolf · April 2nd, 2014, 10:39 AM

Here you go.

SuperAmp13 · April 2nd, 2014, 12:02 PM

Quote:

Originally Posted by NevadaWolf

Here you go.

So looking at this diagram (which btw, I am suprised brown is on there. I think brown is actually for the left or right turn signal) you want to hook the black to your tack wire for the digital guage and then black/yellow is ground to ground the entire system. You do not need to only ground the tach.

I literally just converted to a digital tach last week, so I remember these colors and how it works slightly. If you have any questions, let me know.

If you look at my thread, you will see the digital dash I put on.

http://www.ninjette.org/forums/showthread.php?t=173871

InvisiBill · April 3rd, 2014, 11:46 AM

2008+ Ninja 250r FULL Electrical Wiring Diagram here!

The black/yellow is the common ground wire. The brown wire is switched ignition power. The black wire T's off from between the igniter and coil, and is your tach signal.

I'm not sure if the 250 is exactly the same, but when testing the EX500 stator, you're supposed to get around 60VAC between any two of the three stator leads. The regulator/rectifier converts the AC to DC (rectifies) and limits the voltage to the standard "12V" values (regulates).

linkinpark9812 · April 7th, 2014, 08:43 AM

Quote:

Originally Posted by wanarace94

I have a different sort of idea for a digital tach. I want to take an arduino and make a digital tach with a shift light for the 250. I am in the preliminary design phases right now trying to create a schematic. I have run into a few questions that I'm hoping people will have answers for.

1. I thought I read the new gen tach was powered by a cable. So a adapter would have to be created. Or is there a wire that has the rpm being run through it? I have not looked at the wiring yet on my bike.
2. What voltage is put out at the stator?

I am sure I will have more questions as time go on but this is it for now.

Thanks!

Kevin

I would also recommend using an optoisolator for your tach signal. That way you don't have to deal with any noise from the computer setting off the igniter coils.

On that same note, I believe the 250 uses TDI for ignition. Basically, it GROUNDS the igniter coil wire during ignition, so it is a ground signal you would have to be detecting.

Once you get that, should be pretty easy. Program an interrupt for that pin on a high-low transition. Time between two ignitions and get an RPM!

wanarace94 · April 15th, 2014, 11:32 AM

Thank you guys very much! I am going to be finalizing some of my ideas this weekend when I am home from college. I will keep you updated!

bitaria · April 20th, 2014, 09:28 AM

Subscribe. I'm doing something similar with the idea of using it as racing data logger. Would be interested on updates, especially any efforts to clean up analog signal.

wanarace94 · May 5th, 2014, 10:52 AM

I talked to an EE from a different engineering school in MKE both in agreement a capacitor is going to be worth a try.

My semester is done next week and I will be splitting my free time after my internship on this project and a few other ones i have going on.

bitaria · May 5th, 2014, 02:08 PM

Quote:

Originally Posted by wanarace94

I talked to an EE from a different engineering school in MKE both in agreement a capacitor is going to be worth a try.

My semester is done next week and I will be splitting my free time after my internship on this project and a few other ones i have going on.

Feel free to post up a schematic if you get it working!

bitaria · May 7th, 2014, 07:23 AM

http://www.allaboutcircuits.com/vol_2/chpt_8/2.html

You may find this useful, I did a bit more looking around last night, not sure yet which design will have the best results, but implementing a simple filter like this should do the trick for tach signal.

April 1st, 2014, 07:57 PM	#1
wanarace94 The Dark Horse Name: Kevin Location: Waukesha Wi Join Date: Jul 2012 Motorcycle(s): 09 ninja 250r SE, 71 honda Cl100 Posts: 52	Digital Tach I have a different sort of idea for a digital tach. I want to take an arduino and make a digital tach with a shift light for the 250. I am in the preliminary design phases right now trying to create a schematic. I have run into a few questions that I'm hoping people will have answers for. 1. I thought I read the new gen tach was powered by a cable. So a adapter would have to be created. Or is there a wire that has the rpm being run through it? I have not looked at the wiring yet on my bike. 2. What voltage is put out at the stator? I am sure I will have more questions as time go on but this is it for now. Thanks! Kevin __________________________________________________ http://mefi.us/images/fuelly/sig-us/146688.png

April 1st, 2014, 08:16 PM	#2
Alex ninjette.org dude Name: 1 guess :-) Location: SF Bay Area Join Date: Jun 2008 Motorcycle(s): '13 Ninja 300 (white, the fastest color!), '13 R1200RT, '14 CRF250L, '12 TT-R125LE Posts: Too much. Blog Entries: 7	The pre-gen and new-gen speedos are run by a mechanical cable to the front wheel. But I thought that the tach was electronic on all generations of the bike. __________________________________________________ Montgomery Street Motorcycle Club / cal24.com / crf250l.org / ninjette.org ninjette.org Terms of Service Shopping for motorcycle parts or equipment? Come here first. The friendliest Ninja 250R/300/400 forum on the internet! (especially Unregistered)

April 15th, 2014, 11:32 AM	#8
wanarace94 The Dark Horse Name: Kevin Location: Waukesha Wi Join Date: Jul 2012 Motorcycle(s): 09 ninja 250r SE, 71 honda Cl100 Posts: 52	Thank you guys very much! I am going to be finalizing some of my ideas this weekend when I am home from college. I will keep you updated! __________________________________________________ http://mefi.us/images/fuelly/sig-us/146688.png

May 5th, 2014, 10:52 AM	#10
wanarace94 The Dark Horse Name: Kevin Location: Waukesha Wi Join Date: Jul 2012 Motorcycle(s): 09 ninja 250r SE, 71 honda Cl100 Posts: 52	I talked to an EE from a different engineering school in MKE both in agreement a capacitor is going to be worth a try. My semester is done next week and I will be splitting my free time after my internship on this project and a few other ones i have going on. __________________________________________________ http://mefi.us/images/fuelly/sig-us/146688.png

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April 2nd, 2014, 07:27 AM	#3
SuperAmp13 ninjette.org newbie Name: Adam Location: Boston, MA Join Date: May 2012 Motorcycle(s): 2012 Kawasaki Ninja 250R Posts: 9	The new gen tach rpms are run through a wire in the 9 pin harness. I want to say it is black in color, but i could be very wrong. If you look up a wiring diagram it will tell you exactly what color it is. The only cable driven guage is the speedo.

April 3rd, 2014, 11:46 AM	#6
InvisiBill EX500 full of EX250 parts Name: Bill Location: Grand Rapids-ish, MI Join Date: Jul 2012 Motorcycle(s): '18 Ninja 400 • '09 Ninja 500R (selling) • '98 VFR800 (project) • '85 Vulcan VN700 (sold) Posts: A lot. Blog Entries: 1 MOTM - Aug '15	2008+ Ninja 250r FULL Electrical Wiring Diagram here! The black/yellow is the common ground wire. The brown wire is switched ignition power. The black wire T's off from between the igniter and coil, and is your tach signal. I'm not sure if the 250 is exactly the same, but when testing the EX500 stator, you're supposed to get around 60VAC between any two of the three stator leads. The regulator/rectifier converts the AC to DC (rectifies) and limits the voltage to the standard "12V" values (regulates).

April 20th, 2014, 09:28 AM	#9
bitaria ninjette.org member Name: Oleg Location: Seattle WA Join Date: Aug 2013 Motorcycle(s): CRF450X, CRF250R/SM, Husky 630 SMS, Ninja 250R Posts: 144	Subscribe. I'm doing something similar with the idea of using it as racing data logger. Would be interested on updates, especially any efforts to clean up analog signal.

May 7th, 2014, 07:23 AM	#12
bitaria ninjette.org member Name: Oleg Location: Seattle WA Join Date: Aug 2013 Motorcycle(s): CRF450X, CRF250R/SM, Husky 630 SMS, Ninja 250R Posts: 144	http://www.allaboutcircuits.com/vol_2/chpt_8/2.html You may find this useful, I did a bit more looking around last night, not sure yet which design will have the best results, but implementing a simple filter like this should do the trick for tach signal.