sti robot project (robotmeter project)-see post #461 if you want to test a setup out! - Page 5

***Mack*** · 04-08-2007, 05:07 AM

lookin' good!

Darksabre · 04-09-2007, 12:11 AM

Makin nice progress!

Brings me back to the days (and nights...) in the EE labs. A friend of mine made a wireless accelerometer. We hooked it up to my "modded" Xmod R/C car (those were the days...) and tore it through the halls. It logged all kinds of neat things like current speed, instantaneous acceleration, lateral g's, etc.

sti robot · 04-09-2007, 11:35 AM

I'm going out today to get a fuse and some other small bits and then it'll be installable in the car. After looking over the spec again it'll power of off the 12V from the car...so I could plug it in where the clock is if I really wanted to...and I might.

W00T!

sti robot · 04-11-2007, 05:01 PM

set it up temporarily in a plastic box on my dash and just took it for a road test. It works better than I thought. I took a video but it sucked so I'll have to try again with someone holding the camera and without a bunch of rain.

I'm probably going to install it in place of the clock this weekend

pictures of the ghetto fab i did to test it out. Everything held together by double sided sticky tape.

I've also been thinking about using a vertical line or a dot or something to keep track of peaks. Not sure though. Thoughts?

sti robot · 04-11-2007, 06:59 PM

I found this in the video section...its like the alms system but not: http://www.crawfordperformance.com/n...gymkhana.shtml

***Mack*** · 04-12-2007, 05:43 AM

Quote:

Originally Posted by sti robot

I've also been thinking about using a vertical line or a dot or something to keep track of peaks. Not sure though. Thoughts?

Lookin' good!

I like the line idea. Maybe treat it like stereo's do, where it leaves the peak bar for X amount of time, while still updating the display. (Hope that makes sense)

Would it be possible to do all three axises (wrong word) of g force? X, Y & Z? This won;t show true g-force b/c when turning the car leans and will do some bit of all axises of force... Maybe you could write a formula to add all 3 up and display 1 general force.

for example: -1 X (turning right), .25 Y (accelerating) & 1.25 Z (peaking a hill) = Force

Not sure how that would work, but you may have an idea.

sti robot · 04-12-2007, 08:33 AM

Sure, the temporary peak hold is something called a VU meter on stereos I think. Adding that wouldn't be to difficult at all. I think I'll try it out.

Adding a 3rd axis is easy as they make 3 axis accelerometers. Not sure if the calculations would always work though. I think the correct way to correct for roll would be a gyroscope (more $ of course). Once I get the video up you'll see how little little lean will change the reading. Also, you'll see how bumps make for an instantaneous change in the reading due to sudden g-forces.

Pitcherman · 04-12-2007, 08:54 AM

How about fabbing up an artificial horizon and vertical speed indicator so I can tell if my car is rolling over in the dark or if I have driven off a cliff?

J/k, it's looking pretty good so far, though the bump thing would probably make it useless in the streets around me.

sti robot · 04-12-2007, 09:02 AM

It doesn't make it useless. It just takes readings from all accelerations. So if you tilt it at an angle rapidly (say a big pothole) it'll make a single quick reading.

I could give you an artificial horizon if you really wanted...but those are for airplanes and rock crawlers

sti robot · 04-13-2007, 05:37 PM

Short update.

-Zeroing of the accelerometer works. So if you have it tilted a little where you mount it, it should start out at zero for readings. Works for both x an y axies.
-Peak meter works. I'm currently using the same bar for the peak. I was going to us "|" but its a special character used by the serial controller to control the backlight. The peak bar decays after time and the pos and neg peaks decay separately.

View Poll Results: What should I work on next (choose multiples if you'd like)?
Lap timer	30	25.00%
Temp gauges (low temps: intake, intercooler, ambient, underhood, etc.)	59	49.17%
boost (w/peak, etc.)	55	45.83%
boost ref ic spray	33	27.50%
EGT/Oil temp - mess with off the shelf senders (egauges sells them by themselves)	45	37.50%
Something else	15	12.50%
Multiple Choice Poll. Voters: 120. You may not vote on this poll

04-11-2007, 05:01 PM	#44
sti robot Spec C Club Feedback Score: 3 reviews Car: 04 STI Java black w/ Fav Mod: a garage Location: Just outside Manassass VA Posts: 1,804 IWSTI Addict since: Sep 2005	set it up temporarily in a plastic box on my dash and just took it for a road test. It works better than I thought. I took a video but it sucked so I'll have to try again with someone holding the camera and without a bunch of rain. I'm probably going to install it in place of the clock this weekend pictures of the ghetto fab i did to test it out. Everything held together by double sided sticky tape. I've also been thinking about using a vertical line or a dot or something to keep track of peaks. Not sure though. Thoughts? Last edited by sti robot; 04-11-2007 at 07:29 PM..

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04-08-2007, 05:07 AM	#41
*Mack* Platinum Member Feedback Score: 14 reviews My Stuff: Subaru Parts Posts: 18,401 IWSTI Addict since: Oct 2005	lookin' good!

04-09-2007, 12:11 AM	#42
Darksabre Junior STI Driver Feedback Score: 3 reviews Car: 05 Subaru WRX STi Location: Gardner, KS Posts: 171 IWSTI Addict since: Feb 2007	Makin nice progress! Brings me back to the days (and nights...) in the EE labs. A friend of mine made a wireless accelerometer. We hooked it up to my "modded" Xmod R/C car (those were the days...) and tore it through the halls. It logged all kinds of neat things like current speed, instantaneous acceleration, lateral g's, etc.

04-09-2007, 11:35 AM	#43
sti robot Spec C Club Feedback Score: 3 reviews Car: 04 STI Java black w/ Fav Mod: a garage Location: Just outside Manassass VA Posts: 1,804 IWSTI Addict since: Sep 2005	I'm going out today to get a fuse and some other small bits and then it'll be installable in the car. After looking over the spec again it'll power of off the 12V from the car...so I could plug it in where the clock is if I really wanted to...and I might. W00T!

04-11-2007, 06:59 PM	#45
sti robot Spec C Club Feedback Score: 3 reviews Car: 04 STI Java black w/ Fav Mod: a garage Location: Just outside Manassass VA Posts: 1,804 IWSTI Addict since: Sep 2005	I found this in the video section...its like the alms system but not: http://www.crawfordperformance.com/n...gymkhana.shtml

04-12-2007, 08:33 AM	#47
sti robot Spec C Club Feedback Score: 3 reviews Car: 04 STI Java black w/ Fav Mod: a garage Location: Just outside Manassass VA Posts: 1,804 IWSTI Addict since: Sep 2005	Sure, the temporary peak hold is something called a VU meter on stereos I think. Adding that wouldn't be to difficult at all. I think I'll try it out. Adding a 3rd axis is easy as they make 3 axis accelerometers. Not sure if the calculations would always work though. I think the correct way to correct for roll would be a gyroscope (more $ of course). Once I get the video up you'll see how little little lean will change the reading. Also, you'll see how bumps make for an instantaneous change in the reading due to sudden g-forces.

04-12-2007, 08:54 AM	#48
Pitcherman STI Master Feedback Score: 6 reviews Car: 04 JVP STi Fav Mod: Blitz NUR Spec R Location: B.F.E, Texas Posts: 8,290 IWSTI Addict since: Apr 2004	How about fabbing up an artificial horizon and vertical speed indicator so I can tell if my car is rolling over in the dark or if I have driven off a cliff? J/k, it's looking pretty good so far, though the bump thing would probably make it useless in the streets around me.

04-12-2007, 09:02 AM	#49
sti robot Spec C Club Feedback Score: 3 reviews Car: 04 STI Java black w/ Fav Mod: a garage Location: Just outside Manassass VA Posts: 1,804 IWSTI Addict since: Sep 2005	It doesn't make it useless. It just takes readings from all accelerations. So if you tilt it at an angle rapidly (say a big pothole) it'll make a single quick reading. I could give you an artificial horizon if you really wanted...but those are for airplanes and rock crawlers

04-13-2007, 05:37 PM	#50
sti robot Spec C Club Feedback Score: 3 reviews Car: 04 STI Java black w/ Fav Mod: a garage Location: Just outside Manassass VA Posts: 1,804 IWSTI Addict since: Sep 2005	Short update. -Zeroing of the accelerometer works. So if you have it tilted a little where you mount it, it should start out at zero for readings. Works for both x an y axies. -Peak meter works. I'm currently using the same bar for the peak. I was going to us "\|" but its a special character used by the serial controller to control the backlight. The peak bar decays after time and the pos and neg peaks decay separately.