[OpenTRV-dev] V0.09 power consumption

Mon Mar 18 19:46:42 GMT 2013

Thank you for reminding me to check the sleep performance before 
re-spinning my sensors.  1.5 uA with the 32.768 kHz crystal oscillator 
running.  Rather than just being a gloat, this of interest because these 
boards are quite similar to what an AVR version of the OpenTRV board 
would need to be.


On 18/03/13 17:26, Damon Hart-Davis wrote:
> Yes, a careful 3-line change (+ #ifdefs!) just knocked ~25% off consumption.  So lots of scope for improvement.
> Rgds
> Damon
> On 18 Mar 2013, at 14:01, Damon Hart-Davis wrote:
>> Hi,
>> Just as a point of reference, the current V0.09 design (on breadboard, some extra instrumentation and pins floating, etc) is drawing a little under 600uA at 3.6V--5V (unregulated), so about 5x the target energy budget to run for 1 year off 2x AA 2000mA NiMH hybrid cells.  Lots and lots of things would improve that; primarily a hardware SPI implementation I think.  That budget would have to include the local motor for an all-in-one implementation too.
>> I don't see it as being especially hard to reach the target consumption with a PICAXE design slightly evolved from V0.09, and I have no reason to be worried about an ATmega/Arduino solution either at this stage, assuming that it uses the same peripherals as for the putative updated PICAXE design.
>> Rgds
>> Damon
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