I've noticed several of these specs before. The issue comes down to
updating the firmware easily.

A simple way of programming would be to install a bootloader that can
accept updates from
a serial port. Unfortunately, there ARE no serial ports any more. So
we have been updating
through a I2C EEPROM in a tiny box with a connector. Works fine except
we cannot change the configuration word(s).

So for that, the PIC would be a PIC16F87 or F88 or the newer cheaper copies.

--Bob A

On 7/10/09, AGSCalabrese <agscal@gmail.com> wrote:
> I want a PIC with two ADC inputs ( 10bits ) , 8 GPIO , a
> timer ......     It can be as slow as molasses.   What is crucial to
> me is that it is $5 or less: that I can pick up a cheep and trivial
> method of programming it ( $25 ) ; that I can get a cheep development
> IDE with Basic or C or whatever ($ 25 )  ; that it runs on 3.3 or 5
> volts.   The bigger the physical size of the pins, the better.  DIP is
> better than SOIC, etc.
>
> I want to quickly bang out a really creepy , dirty , data aquisition
> device that samples two ADC inputs twice per second and talks to
> another device via SPI  ( in, out, clk ) as the slave to a master.
> There will be no demand on the PIC ; the SPI will be slow ( 1K bit per
> second )  , with a total traffic of maybe 50 - 100 bits per
> second ) .  The master will not bother the PIC for .25 seconds after
> asking for status so there is plenty of time to complete an ADC cycle.
>
> Gus
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