Recent content by dm9876

I think we can all agree that the current regulations on ebikes are not helpful for anyone or anything, however nothing will change without well backed, organised and sustained lobbying. Clearly after nearly 1000 posts in this thread none of us fit the bill to make it happen. I think the change...

OLED display

Given the isolated output, maybe the solution for those wanting to series up for higher voltage could be as simple as a CC-CV programmable power supply mode with nothing more than voltage and current set points, possibly an optional timeout. Of course the data on the other unit would be wrong...

I do like the suggestion a few pages back of pushing for an entirely different classification. For me, any new or adjusted regulation needs to do away with power output having anything to do with it. Regulating power output is not enforceable in any practical sense. If we propose something...

Post on DIY Drones blog about the device. http://diydrones.com/profiles/blog/show?id=705844%3ABlogPost%3A1568189 Comments on there from the device developer suggests that it's using a resistive divider network. which means uneven cell drain and maybe different levels of accuracy for each cell...

I so agree agree with you! I think the real thing that holds us back is economy of scale.. can we really integrate all of the front end for $15 per 8 cells? Plenty of people on here have done or tried to roll their own BMS, just never seems to be popular beyond a few or the cost is very high...

yeah, seems like a good idea but unsprung mass issues would kill the handling. a few years back these ones sounded promising but seemed to go no where. Not sure if the 3Ph AC axial flux induction approach would be less weight or what? they also quoted similar power figures, but after some...

http://www.bbc.com/future/story/20130212-why-you-really-hate-cyclists likely similar reasons of cyclists feelings toward ebikers. Dean

Re: My earlier statement about ABS vs polycarbonate cases. I found some data here: http://www.tcforensic.com.au/docs/article10.html (Celcius) ABS: melt range 88°-125°, ignition 416° Polycarbonate: melt range 140°-150°, ignition 580° Also found there are polycarbonate cases available from...

I too am interested in this approach. I was looking at building a pack using these 'pelican' style hard cases, they would provide impact protection as well. http://www.jaycar.com.au/productView.asp?ID=HB6381 My concerns with this approach are that sealing it up is also insulating it and the...

That nfpa article is an excellent reference. (someone posted it earlier in this thread as well) I think that we are discussing interesting things, but there is no one answer. 'safe' chemistries. quality of products etc are all relative anyway. Different choices are appropriate for different...

what about polyfuse's (PPTC) in the balance wires (parallel cell connections)? Dean

@TheBeastie, that's the sort of platform I was planning to use, mainly due to built in Wi-fi etc. Yeah I forgot to mention that the RP, while more powerful than an Arduino is weak by PC standards. Those USB form factor Android pc's are much better. You should note that the MK808 while dual core...

I was thinking along the line of the Celllog8's funky power supply arrangements to the differential amps ref: http://www.endless-sphere.com/forums/viewtopic.php?f=14&t=20142 Maybe it is not trying to be so flexible and is clearly intended for permanent connection. Still, it's not something...

Raspberry-Pi (RP) has some general purpose I/O but not like Arduino (no analog inputs if I recall)... but it is orders of magnitude more powerful and runs Linux (compiled for ARM cpu architecture so not 100% of Linux stuff can be re purposed here, since most is compiled for x86 architecture and...