[Ovmsdev] OVMS v3 - Microcontroller

Julien Banchet jaxx at jaxx.org
Tue Feb 2 15:34:48 HKT 2016


I love the OpenCV part, though I'll have to find a way to retofit
powersteering and brake actuators in a Twizy, that said, it all shoots way
beyond the scope of OVMS (even a v4/v5) imho... but, but, but... an OVMS
module shall be the bridge and the low-level comms offloader for an
optionnal "Hyper Smart OpenCV Dashboard Music Streaming thingy" that a
sister project can take over :-) (my opinion again)

So yeah, It needs to be beefy, and the ESP32 seems to be a nice candidate
and embeds by itself a nice load of functions (Wifi and BLE!)

It has no CAN, but it has SPI (can't tell how many on this pinout) and
plenty of HS GPIOs for native or soft UARTs. Having 2 CANbuses shouldn't be
an issue (I'll let those who fathomed that more than me tell me wrong

I don't believe everyone needs a 2/3/4G stack, not counting that those
radios end up being the big bucks of the BOM.

Instead, would it be possible to envision a naked board with an extension
bus and i2c, interrupts, multiplexed (or not) enable and power lanes? (an
edge fitted socket for example, each extension board presents another

The motivation for this particular request is:
- It lowers the base cost, with knowledge it can be enhanced, and still
carries Wifi+BTBLE for local connectivity with an ESP32
- I doubt my Twizy will ever be stolen to be brought out of LoRa range, and
those networks are being deployed quickly, no need for power hungry GSM
stacks (that empty my Twizys' 12V battery in 3 days, driving me nuts by the
- I might want a home brewed I2C GPIO extender on it, a socket makes it
easy to make (or a stepper motor drivers to pilot a paintball gun turret
fitted on the roof and shoot *ssholes)
- The hypothetical day I upgrade to a Tesla 3, I can add that 5G Module
that wasn't out yet ;-)

Just thoughts,


On Mon, Feb 1, 2016 at 8:30 PM, Michael Eymann <Michael.Eymann at networkz.de>

> All,
> what about opening our garden, providing a public park which could be used
> for several features beside the scope of this group?
> 3G/4G Wlan Bluetooth GPS whatever could be added / replaced easily….
> what i mean is vocabulary like:
> - raspberry pi
> - CarPI (CarPC)
> - OBD - smartphone speedometer gadgets (sure really useless - but the
> mainstream love it)
> - Harry´s laptimer support (http://www.gps-laptimer.de) // video: Harry's
> LapTimer GPS/OBD II Video Overlay - Nordschleife with 911 GTS
> <https://www.youtube.com/watch?v=fTCNhmsFZBE>
> https://www.youtube.com/watch?v=fTCNhmsFZBE
> - Wlan.. repeater - hotspot… (my favorit)
> this could also enable add on development….
> - spotify
> - surround view parking (raspian & openCV?) // AVM: AVM (Around View
> Monitoring /monitor ) 4CH camera become 360 degree Parking Guidance System
> <https://www.youtube.com/watch?v=1Q9iVoSvjGk>
> https://www.youtube.com/watch?v=1Q9iVoSvjGk
> - KITT Watch - car call?
> - replace Infotainment systems
> - SmartAutomation like OpenHab integration (They call it „Binding“ - Tesla
> Model S Binding is already integrated - did they overtake us? ;-)
> http://www.openhab.org
> views?
> Michael
> Am 01.02.2016 um 18:51 schrieb Dominik Westner <ovms at nikwest.de>:
> Generally I think 3G doesn’t make a lot of sense. A new platform should be
> 4G capable. As far as I know 2G is more likely to stay longer than 3G.
> I know already some areas in Germany and Austria where you can find 4G and
> maybe 2G, but no 3G.
> For example seeedstudio retargeted their Rephone 3G module to 4G after
> some investigations about the future of 3G.
> (
> https://www.kickstarter.com/projects/seeed/rephone-kit-worlds-first-open-source-and-modular-p/posts/1468366
> )
> Just my 2 cents
> Dominik
> On 01 Feb 2016, at 18:30, Arthur Hebert <ahebert at gmail.com> wrote:
> The Particle Electron has recently caught my attention:
> https://www.particle.io/cellular. Actual performance and usability are
> unknown, since the first units don't ship until later this month, but it
> has some attractive features:
>    - low-cost M2M-oriented international SMS/data plans ($3/mo. for 20k
>    messages)
>    - STM32F205 MCU with *1MB flash*, 128k RAM and *2 CAN buses*
>    - free development IDE: https://www.particle.io/dev
>    - also a free web-based dev environment at https://build.particle.io
>    (I assume/hope this will support the Electron cellular board when it comes
>    out)
> I know it doesn't come close to meeting the RAM requirements, but the
> cellular plan is a pretty big draw IMO. Perhaps worth using this module in
> conjunction with another board with a better MCU?
> -Arthur
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