Re: uC Slection for a learner project

On May 3, 10:51 am, AC Me <mmal...@xxxxxxxxxxxxxxxx> wrote:
Hi all.

Yet another request for help in the selection of an appropriate uC.

I would like to construct a data logger. This data logger may be
located in areas remote from power and human kind. It will read 1-Wire
interfaced weather instruments at an interval of 2 seconds and store
the weather data over an extended period of time, such as a year. The
weather data acquired should be stored with the date and time. The
stored data will have to be transferred to a PC at some point. The
requirements for such a data logger would be:
1. Very small power consumption. It would be nice if the uC would be
capable of operating from the merest suggestion of a hint of a
picowatt :)

If you put the uC in standby between readings, it can extend battery
life substantially. For example, our custom chip run at 800uA and
standby at 80uA. It can run standby for 100 days and forever with a
small solar cell.

4. PROM - I do not know what size the program will be - yet.

We have 16K One Time Programmable PROM.

7. A real time clock

Yes.

8. Some mechanism to configure the device - for example the date and
time; this could be via a PC link or perhaps the use of on-board
switches and an LCD. If switches/LCD then the ability to drive an LCD
would be required.

Yes, we have LCD driver (up to 12 segments and 4 commons)

9. Reasonable overall cost.

50 cents for the uC.

10. The availability of evaluation boards at perhaps $100 or less.

5 dollars for the evaluation board.

11. Free or cheap development tools

Yes, free C compiler.


About me...
I have discovered that the best way to learn a subject is to give
oneself a project that is of real use - hence the above. I studied
electronics in college in the early '80s. There, we did some work with
the Intel 8085 and the Rockwell 6502.

Yes, it's a 6502 core in a 32 pins QFP (5mm x 5mm)
.