On Tue, Aug 18, 2009 at 9:29 AM, Vicent Colomar
Prats<vicentecolomar@gmail.com> wrote:
> Solarwind, most regular smd components (resistors, capacitors, diodes, trts,
> ...) are cheaper than their dip versions. They are smaller and no need for a
> special package.Look at online shops, ebay, etc.
>
> As Bob Blick said, it's degenerating too much discousing reel switch or not
> reel switch. So back again to PIC, have you an idea what micro are you going
> to use? 16F, 18F, ? Pin count?
> And about periferals, battery type? Comercial cycle computers normaly run on
> CR2032 or 2025 coin cell batterys. Number of buttons? Suppousing you are
> going to use buttons, may be a touch lcd?
> What are you going to use to program, asm or C ?

The actual cost of the components is not my worry. It's the shipping
and duties fees that cost more than the components themselves.

For this type of project, even a 16F will do, but I'm probably going
to use a dsPIC33F128GP802 as I already have a lot of those (DIP form,
however). As for battery type, I can use 2 AA batteries or something,
it's not a big deal. All of the electronics can fit nicely under the
seat. I need a proof of concept going at first, then I can work on
improvements.

As for buttons, I don't really need any. To keep the project as simple
as possible initially, I just have an on/off switch and pre-program my
RTC chip (which is SMT) initially and the rest is good to go.

I will program it in C. For anything 18F and higher, I will use C as
the assembler presents too many options and instructions and things
for me to optimize well. The 12Fs and 16Fs have a much simpler
assembler (and I already know it) so I could use ASM for those series.
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