[Hackability] battery voltages in mobility scooters
Ian Smith
ismith at metaforgotten.org
Sat Sep 22 22:05:01 UTC 2012
I can't make it on Thursday or Friday, but I could definitely be there on
the weekend, either day.
On Sep 22, 2012 6:03 PM, "john benson" <followthatparade at yahoo.com> wrote:
> sorry to hear you were out of sorts zach!
> thanks for the volt meter plans, i don't have those chips handy but would
> like to try to build when
> i get them.
> the folding scooter needs a new motor? bummer - didn't know.
> i just gave away a really big one yesterday. four wheel bulky...
>
> *************************************************************
> ~john trevor benson q.
> ------------------------------
> *From:* Zach <organic_unity at yahoo.com>
> *To:* "heinousbutch at gmail.com" <heinousbutch at gmail.com>; john benson <
> followthatparade at yahoo.com>
> *Cc:* "hackability at lists.noisebridge.net" <
> hackability at lists.noisebridge.net>
> *Sent:* Saturday, September 22, 2012 12:45 PM
> *Subject:* Re: [Hackability] battery voltages in mobility scooters
>
> Hey John,
> Here's the file then, it's a small one so hopefully it will go out on
> our list. It's a great little chip that does a 10 LED display and someone
> posted this in an online forum as a way to expand it to take 24v+ I
> haven't built it yet but it is pretty simple enough and I bet it works
> great.
>
> Would be interested in hearing about the scooter, though if I can get the
> motor replaced on the folding one I think I will be very content with what
> I have :) Would still love to come to the shop sometime soon, have you
> been able to make a key? I was really sick for a few weeks so I've been
> out of touch. Any ideas what days you're around the coming week?
>
> Also-- to the group--- LETS MAKE A SCOOTER HACK DAY :D I know weve been
> talking and talking but lets just make this thing happen! How about
> Thursday or Friday this coming week, 27th and 28th? Or that weekend? I'm
> available then and can bring lots of cool stuff to show if we meet at
> Noisebridge. Just post back if you're interested and have a preferred day
> :)
>
> Zach
>
> --- On *Sat, 9/15/12, john benson <followthatparade at yahoo.com>* wrote:
>
>
> From: john benson <followthatparade at yahoo.com>
> Subject: Re: [Hackability] battery voltages in mobility scooters
> To: "heinousbutch at gmail.com" <heinousbutch at gmail.com>, "
> organic_unity at yahoo.com" <organic_unity at yahoo.com>
> Cc: "hackability at lists.noisebridge.net" <hackability at lists.noisebridge.net
> >
> Date: Saturday, September 15, 2012, 10:26 PM
>
>
> Hey Zack- any schematics for a 24 volt for meter or for that matter any
> add ons you may know of could be very helpful
> I just acquired another scooter you may be interested in
> Sent from Yahoo! Mail on Android
> *From: *Zach ;
> *To: *Susan Werner ;
> *Cc**: *hackability at lists.noisebridge.net ;
> *Subject: *Re: [Hackability] battery voltages in mobility scooters
> *Sent: *Mon, Sep 3, 2012 12:16:24 AM
> Thanks Susan, this could be very useful!
> One of the hangups I'm finding with the BQ2013H is sourcing the 0.005
> ohm 10W resistor. I can only find suitable ones on Digikey for $3 each +
> ship... itll be something like $10 just for that part.
> Also, the max battery capacity is measured at 15Ah, which means it will
> work for Liz's scooter but not my main one. Liz, would you want the
> circuit after I'm done building it? It makes the most sense for you to use
> it :)
> Other than that, it's very very badass.
> I also did another scooter hack last night at NB, and a very useful one I
> think. My forward/reverse pot comes loose over time with its shitty set
> screw, resulting in me moving slowly backwards when I put the key in. The
> only way to fix it is to disassemble the whole thing and reset the
> screw...which is a serious pain in the arse to do every so often. The
> fix? Wire in a parallel externally adjustable 50k trimmer pot. It was
> Jake's idea, and it works great :)
> Also got a schem for using the LM3914 with a 24v lead acid battery I can
> upload here if people want a simple 10-LED volt gauge for the chairs. Its
> pretty nice.
> Zach
>
>
> ----- Original Message -----
> From: Susan Werner
> To: Zach
> Cc: hackability at lists.noisebridge.net
> Sent: Wednesday, August 29, 2012 1:56 PM
> Subject: Re: [Hackability] battery voltages in mobility scooters
> Oooh, thanks. That's useful information. Can you give me contact
> information
> for John? I'd just like to ask before I commit to a certain design.
> This might be of interest -- it's a fully analog (so no microcontroller
> needed!)
> power and current monitor that's very easy to use:
> http://www.linear.com/product/LT2940www.linear.com<http://www.linear.com/product/LT2940>
> /product/LT2940 <http://www.linear.com/product/LT2940>
> --
> Susan
> On Aug 29 13:41, Zach wrote:
> > Hey Susan,
> > I've never seen a scooter with over 24v....it would be very rare to
> find. John is a good person to ask (with the scooter shop).
> >
> > Great news: Got the Bq2013H chips in the mail and after some intense
> datasheet work I have finally calculated all the set values and parts for
> our application. See attached schematic. I'll update my webpage soon with
> more details.
> >
> > I'm going to build the circuit and test within the week and if it works
> we can get on designing a PCB board for it! One downside I've realized is
> that it works with a max battery capacity of 15Ah (according to the site
> anyway), which means it will work for most scooters but might not be the
> best for the especially big ones. But we'll see.
> >
> > --- On Wed, 8/29/12, Susan Werner wrote:
> >
> > > From: Susan Werner
> > > Subject: [Hackability] battery voltages in mobility scooters
> > > To: hackability at lists.noisebridge.net
> > > Date: Wednesday, August 29, 2012, 4:05 AM
> > > I'm working on a DC-DC converter /
> > > battery charger circuit with Liz to act as a
> > > regenerative brake for mobility scooters, and it's an
> > > explicit goal for the
> > > design to be easily adaptable on different models. I've a
> > > question -- what is
> > > the highest battery voltage commonly used? I need this
> > > information in order to
> > > properly select the DC-DC converter controller and the power
> > > transistors for
> > > the DC-DC converter. I know 24 volts is a voltage that's
> > > used (two 12V
> > > batteries in series), but are there any mobility scooters
> > > that use higher
> > > battery voltages? Are there any that use voltages that are
> > > higher than say,
> > > 36 volts? The end goal is to have a model-agnostic
> > > regenerative brake
> > > controller that needs minimum customization (beyond, of
> > > course, desired
> > > voltage output) for each individual installation.
> > >
> > > Also, if you'd like to get involved, let me or Liz know!
> > >
> > > --
> > > Susan
> > >
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