As a novice, I have tried several approaches to get this going.

No one seems too eager to take on my relatively small project for a small
fee, and I have been unable to find a ready-made design. So, for a learner
with primarily analog experience, what is the most direct route to PIC
signal generation apps like the following.

To produce simultaneously 3 sinewaves of differing amplitude and frequency
(between 0.1 and 100Hz) at 8 bit res. One SW will always sit at max
available swing.

Desired values for both parameters above are to be entered by myself at
program stage (ideally). Increments of 0.1Hz and 0.03 volts (assuming 3V
operation) are preferred for this. I can be a bit flexible according to the
most straightforward maths.

Above SW's are then summed to one output. Each is to be capable of being
independently disabled via external link. I suppose 3 separately pinned
outputs could be _externally_ summed, level trimmed, and switched if this
is all I can manage in the next few months.

Overall output level is to be compatible with op amp input. Circuit to run
on 4 x "AAA" batteries. Micro looks at battery voltage and lights LED when
low. The device needs to be portable and stand-alone, so that let's out
PC's. I also need about a dozen for my university field work.

There are a few similar but related projects I am also interested in doing,
so continually out-sourcing design work is not an economical option.

Thus far, I have found only strings of partially suitable code online, and
a couple of relatively expensive learning kits, such as Brunning's, that
offer a sine generation project as part of the manual.

What is the most efficient PIC (or Atmel) to use? Where is my closest
starting point, kit, code library, etc. in terms of a hands-on learning
experience? BTW I am not interested in control apps, but I wish I were
because EVERYONE seems to be doing this.

Or ... has anyone seen or done anything that will fit the bill, more or
less as is? And, of course, I would still be willing to pay someone
something for the working code.

Any suggestions much appreciated.

Peter Nielsen

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