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| digital speedo https://www.ausmini.com/forums/viewtopic.php?f=2&t=76584 |
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| Author: | min-E [ Mon Apr 30, 2012 7:01 am ] |
| Post subject: | digital speedo |
Has anyone installed one on their mini? If so do you have any pics? Can it be done and What is involved? |
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| Author: | simon k [ Mon Apr 30, 2012 11:16 am ] |
| Post subject: | |
I made this a few years ago, it works really well to produce a speed pulse... but the actual speedo is still in my pile of unfinished projects. 
It's just a little magnet in a ring on the speedo drive that goes around, and a hall effect switch that gives a 0v output. Someone else did one using a thingy that picked up when a wheel weight went past a sensor (bit dodgy), and other ideas were thrown about such as putting something inside a rear brake drum to pick up the back of wheel studs etc. |
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| Author: | smac [ Mon Apr 30, 2012 11:26 am ] |
| Post subject: | |
Easiest would be a cycle computer, with the pick up strapped on the axle or pot joint. |
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| Author: | seifer [ Mon Apr 30, 2012 11:29 am ] |
| Post subject: | |
I have an Acewell guage on my bike but I believe I have seen these istalled in Minis. They operate via a reed sensor with a magnet attached to a pot or wheel etc etc. Very simple to set up. 
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| Author: | Harley [ Mon Apr 30, 2012 12:04 pm ] |
| Post subject: | |
The Acewell bike senders plug directly into early speedo cables for minis. |
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| Author: | simon k [ Mon Apr 30, 2012 12:05 pm ] |
| Post subject: | |
pfft, all too simple - I like to do it the hard way 
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| Author: | Mike_Byron [ Mon Apr 30, 2012 1:12 pm ] |
| Post subject: | |
Black box recorders and usb to GPS are all the rage now. My son is currently doing something similar utilising an android notebook on his XM ute. Mike |
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| Author: | drmini in aust [ Mon Apr 30, 2012 1:15 pm ] |
| Post subject: | |
You can get GPS speedos in USA now, no messing about with drive adaptors to get a pulse. They just lock on and away ya go. Matching tachos too. There is a thread on MM forum I'll try and find it. [edit] here ya go- http://www.minimania.com/web/startretur ... thread.cfm |
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| Author: | smac [ Mon Apr 30, 2012 1:17 pm ] |
| Post subject: | |
The only problem with GPS is if you drive around watching one you'll see frequent black spots. Especially in town and hilly terrain. Kinda annoying for a speedo and odo. |
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| Author: | simon k [ Mon Apr 30, 2012 2:17 pm ] |
| Post subject: | |
it wouldn't be *just* GPS - it'd use accelerometers as well. Accelerometers do the instantaneous changes in speed and would cater for blackspots, GPS keeps it honest You can see with your own navigation GPS that it predicts the speed, if you accelerate then brake, the speed will keep going up for a bit after you started braking... |
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| Author: | Mike_Byron [ Mon Apr 30, 2012 4:01 pm ] |
| Post subject: | |
The official lag for a GPS signal here in Australia is 360 milliseconds but (depending on the GPS) some processing time. Always that bit behind. Mike |
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| Author: | sgc [ Mon Apr 30, 2012 4:54 pm ] |
| Post subject: | |
If these GPS speedo's are any good they'll do dead reckoning as well using inertia sensors / accelerometers. The factory GPS in my old BMW did this, and was surprisingly accurate - it would have my position spot on at the far end of the Burnley Tunnel in Melbourne, which is several km's long. |
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| Author: | min-E [ Mon Apr 30, 2012 5:31 pm ] |
| Post subject: | |
Thanks for all the responses guys a lot of options out there I will do a lot more researching and weigh up the pros and cons. Cheers Pete |
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| Author: | 1071 S [ Mon Apr 30, 2012 9:25 pm ] |
| Post subject: | |
If these GPS speedo's are any good they'll do dead reckoning as well using inertia sensors .... I hope they've improved in the last few years. It was always amusing to pull up at a traffic light in NY and watch the GPS cursor march away into the distance. They would snap back into place if you crossed the right intersection and the machine got a glimpse of a satellite.... Cheers, Ian |
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| Author: | Irish Yobbo [ Mon Apr 30, 2012 9:36 pm ] |
| Post subject: | |
But the good thing about GPS's is that the speed is very accurate and near instantaneous. GPS's donit usually use dead reckoning for speed calculation, they often use the doppler effect from the signal to calculate the speed. This means that, so long as it has a signal, it can calculate the speed. |
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