BrianHawley wrote:Wow, that's amazing.
I like a roughly original look inside and out, so I always had the dream of replacing the central speedo with a round display showing a purely digital rendering of the normal instrument, but able to switch over to a reversing camera image or a SatNav display when required. The main thing thwarting me is that larger round displays seem to be totally unavailable. Most of them seem to be for watches. TomTom do a round SatNav for scooters (https://www.tomtom.com/en_gb/sat-nav/scooter-sat-nav/) but it's not clear where they get the displays. Might even be a rectangular one and just masked off to appear round.
On the subject of GPS speedos, Dakota Instruments do a nice range. With an additional antenna they even recommend them for cruise control - so I guess they can be fairly accurate (other than in tunnels!)
What's your plan for the outer ring? A circle of LEDs?
Your design has inspired me. A ring of LEDs on the normal bezel and a rectangular display in the middle masked to look round might be the way to go. Although I'd probably go with the 'pi as I'm happier with Python than C.
(Sorry if this post looks like Chinese to any non-nerds!)
Bidz wrote:No extra LEDs, but maybe some where the warning lights ordinarily go. I think extras look a bit tacky and the idea is to display any data using the 0-100 scale and the OLEDs.
Bidz wrote:That technology from Dakota isn't cheap. It could be implemented cheaply with an Arduino and GPS sensor I suppose - you'd never need to recalibrate then! I'd just be worried how reliable hobbyist technology is, and the speed sensor is [theoretically] bulletproof.
Bidz wrote:That said, I'm a bit worried about the reliability of the code at higher pulse counts. At 70mph the pulse rate will be around 40Hz, and with the screens and servo sensor I'm not sure the Arduino will handle it reliably - a GPS chip would just output a speed integer, so this might be the way to go........
Custard wrote:All good stuff I like it.
Not sure if it would give more or less pulses than your set up, but the one I had on a kit car had 4 magnets that were clamped to the propshaft, then a hall effect sensor mounted close by.
All close to the gearbox end of the prop as it does not move much there and the sensor located at the side of the prop too so it could be close but safe from contact as the prop should not move sideways at all.
The one I have not yet fitted has a disk with fifteen holes in it and that is supposed to sandwich between the prop and diff, but it could be vulnerable so I am slow to fit it.
If you could mount a sensor to pick up wheel speed rather than gearbox output that would reduce your pulses a fair bit too.
Panky wrote:Sounds good Just remember to fit a normal bulb in the ignition light position, the charging circuit doesn't like LEDs
BrianHawley wrote:Yes, I missed something obvious there. You still have the original needle mechanism and can use that. Stepping motor? Would make a cool multi-function indicator.
BrianHawley wrote:Can you run the counter in a different thread? I don't really know the Arduino. Alternatively, maybe external electronics with a divider to send out one pulse to the Arduino for every ten in?
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