[Ovmsdev] OVMS v3

[Mastro Gippo]

I really don't like the SO-DIMM form factor, especially in an automotive
environment. If the biggest problem is current consumption, I think that
the best option would still be a smartphone (maybe MTK based), as a phone
can easily last a day or two on a 1200mAh battery while receiving
notifications from the network...


2014-06-23 6:42 GMT+02:00 Mark Webb-Johnson <mark at webb-johnson.net>:

> Marcos,
>
> Looks really interesting as a form factor.
>
> I looked at both Pi and BeagleBone black for this project, but power
> requirements are very high for both. The modules are both designed for 3G
> graphics via HDMI, don’t have CAN bus, and probably have too high CPU speed
> and RAM+Flash for our needs. Really not a good fit from what I can see
> (excessive in some areas, not enough in others), but the Raspberry Compute
> Module is a lot closer than the original Pi A. It seems to be that using
> the older A version of the Pi, and re-working the power supply, 20% can be
> saved on the power, but that is still no-where close to what we want. I saw
> another product where they paired a little arduino MCU beside the Pi, to be
> able to sleep/awake the Pi and reduce power consumption.
>
> From a power point of view, the only way this is going to work if we are
> going to be able to put as much as possible to sleep when the car is not
> driving and not charging, but to be able to wake it up remotely from the
> App if necessary. It seems that using a smart modem should give us that
> capability - as we can control GPIOs from the modem and have that wake up
> the CPU if necessary.
>
> Regards, Mark.
>
> On 21 Jun, 2014, at 4:59 am, Marcos Mezo <mmezo at selexco.net> wrote:
>
>  Hello everyone,
>
> no really knowing at all about all this, but... Have you heard about the
> Raspberry Compute Module?
>
> It's basically the Raspberry A on a module + 4Gb Flash. I think it's
> design is open and the page says it will sell for about 30$ in batches of
> 100, a bit more for individual purchases. It has internal 4Gb Flash and
> 512Mb RAM and a 32bit CPU ). All the gpios and everything else are routed
> to a SODIMM connector.
>
> I've read in the product documentation [2] that internally, the broadcom
> chip does not power at all it's different parts or modules unless they are
> beeing used, so if no 3D is used this part of the chip is not powered and
> draining any power...
>
> Theres is still no CAN or Wifi or bluetooth, but maybe that could be in
> the "mainboard". There could even be different mainboards with/without Wifi
> or 3g...
>
> Just my 2c in case it can be useful.
>
> [1] http://www.raspberrypi.org/raspberry-pi-compute-module-new-product/
> [2]
> http://www.raspberrypi.org/documentation/hardware/computemodule/README.md
>
> Marcos
>
>
>    - For me, the requirement comes down to a base framework and module
>    that supports:
>     - 32bit CPU with enough grunt, and a low-power sleep mode
>       - Dual CAN
>       - Async + I2C + SPI + GPIO expansion
>       - SD-Card
>       - USB
>       - Lots of RAM and FLASH
>       - Wifi
>       - Bluetooth
>       - Optional GSM
>       - Optional display (or can we get away with bluetooth to a
>       cellphone?)
>
>        - What is interesting is the advent of low-cost Linux frameworks
>    that are very close to what we need. Things like the BeagleBone and
>    RasberryPi are fascinating, but really designed for HDMI video output - and
>    the overhead of GPU + HDMI is a huge power drain. The closest I've found to
>    what we require is (
>    http://compulab.co.il/products/computer-on-modules/cm-t335/) - pretty
>    amazing little device - low power, wifi+bluetooth, dual CAN, up to 512MB
>    RAM and 1GB FLASH, for around US$50 (in horrendous quantities). I'm working
>    with my contacts in China to see if we can base on a dev board something
>    like that. If they can make Android phones for US$50, we should be able to
>    get the guts of such a device for something similar. Then, add on GSM, take
>    it from a BOM to a product, and we're probably looking at something still
>    <US$150 but with so much more. The closest thing to ideal I've found at the
>    moment is build a baseboard (connectors, power, CAN buses, etc) and have
>    slots to take that CM-T335 module and an optional GSM module. But, I still
>    think we can find something on the China market even closer to what we
>    want/need.
>
>
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