[Ovmsdev] OVMS v3

Marcos Mezo mmezo at selexco.net
Sat Jun 21 04:59:11 HKT 2014

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/


>   * For me, the requirement comes down to a base framework and module
>     that supports:
>       o 32bit CPU with enough grunt, and a low-power sleep mode
>       o Dual CAN
>       o Async + I2C + SPI + GPIO expansion
>       o SD-Card
>       o USB
>       o Lots of RAM and FLASH
>       o Wifi
>       o Bluetooth
>       o Optional GSM
>       o 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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