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manuka
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Joined: 18/12/2006
Location: New Zealand
Posts: 19

Posted: 09:13pm 17 Dec 2006

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Quality (Cateye) bike computers can now be picked up here in NZ for ~A$12,& so I've been exploring driving one with a Picaxe-08M. Results have been pleasing - the idea of course is for the bike computer to show current (in Amps) as a km/hr & A.h as km. My eventual lash up thus is a promising charge "fuel gauge", suiting battery charge monitoring from erratic energy sources such as PVs & wind.

Gizzmo's web site has been a great help with shunt & hall effect sensors, but I've initially settled on the former as it's worked out very cleanly & simply, with minimal code. We intend using it as a schools electronics motivator, so low cost is naturally an issue too.

It's shaping up as a "Silicon Chip" educational article, perhaps for the Feb. 2007 issue. Full credit to "thebackshed" will naturally be given ! Thanks- Manuka (Stan)

Gizmo

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Joined: 05/06/2004
Location: Australia
Posts: 5078

Posted: 01:39am 18 Dec 2006

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Very clever idea there, those little bike computers have a bunch of usefull features. Never thought of connecting one to a PicAxe, but it makes sense and could be used for a lot of new applications. I think some of those bike computers have a paek hold, so they could also record peaks in current.

Thanks for the plug.

Glenn

The best time to plant a tree was twenty years ago, the second best time is right now.
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manuka
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Joined: 18/12/2006
Location: New Zealand
Posts: 19

Posted: 10:39am 18 Dec 2006

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Glenn - happy to point these out. The "Cateye Velo" model used here certainly also has a peak hold option. I'll eventually post detailed pix/code/schematics but for starters check => www.picaxe.orcon.net.nz/bikecomp.jpgEdited by manuka 2006-12-19

brucedownunder2
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Joined: 14/09/2005
Location: Australia
Posts: 1548

Posted: 03:06pm 18 Dec 2006

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Hello Stan, remember me ?
You came to my house on the North shore of Sydney some years ago with Brett from Newcastle.
Well ,I'm retired now and more than ever fiddling around with all this windmill stuff. In the hinterland,west of the Gold Coast.

Good to see you in the pack, look forward to reading your contributions-follow your articles in Silicon Chip .

Bruce

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manuka
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Joined: 18/12/2006
Location: New Zealand
Posts: 19

Posted: 08:31am 23 Dec 2006

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Bruce- recall your F&P setup well. Mmm- that must have been (engages brain Google) Dec 2002? Given the sunshine in Queensland I'm suprised you've not gone solar instead !

Have just uploaded draft 08M/Bike Computer material & would appreciate any comments pre the early Jan. publication deadlines. Naturally I've a lengthy text coverage & other pix, but the key files are -

Schematic (draft)=>www.picaxe.orcon.net.nz/bikeamph.gif

Driving code =>www.picaxe.orcon.net.nz/bikeamph.bas

Breadboard layout =>www.picaxe.orcon.net.nz/bikeamph.jpg

EXTRA: Could anyone near a bike shop please do a me a favour & check the Oz. prices of CATEYE Velo 1 bike computers. CATEYE are the worlds #1 firm in this field, but they've many Velo models at higher prices. Even here in little old EnZed I spotted a Velo 8 ... Thanks ! StanEdited by manuka 2006-12-24

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