>>
>> It would be a good thing to take cheap displays, make a USB to SPI
>> convertor board, a bay mountable fixture possibly with buttons.
>> Overall cost budget should be pegged at $12-13 which is achievable.
>> Typical components and prices are LDO $1.5 ( 5V to 3.3V), a
>> microcontroller with a USB device (PIC or MSP $1.5)  and board would
>> cost approx $1 with passives.
>>
>
> Yes. Sub $15 is my target too.
>

I am definitely buying one!

Do you guys know what will be the power consumption like ? The display 
is the one that worries me.

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