9999 count appearing on the LED
display. This time, however, the count
is being produced by the 28X1, not
the 08M. Also, you’ll see that I didn’t
include the zero-blanking code in the
28X1’s test program — I left that little
chore for you!
So, that’s it for our LED display.
We have successfully constructed
another stand-alone serial peripheral
for use with our PICAXE projects.
I’m sure you have a couple of pet
projects that could make good use
of a four-digit LED display — I know
The first thing that comes to
mind is a countdown timer. The
28X1’s settimer command would
make a timer project relatively easy
to implement. We may do exactly
that in one of the future installments
of the Primer. In the meantime,
you may want to give it a try on
In any case, I have an entirely
different sort of project in mind
for our next Primer. I have been
working on a new way to power
and program PICAXE projects.
(How’s that for alliteration?) This
approach — which I call the AxMate
— is capable of implementing both
these functions (power supply and
programming adapter) in a circuit
that occupies less than 1/2 square
inch of space.
To whet your appetite, Figure 2
shows the stripboard circuit that we
will be constructing. This little
AxMate board is powering the 08M
circuit that’s installed on the
breadboard, and I also used it to
download a simple “Hello World!”
program to the 08M.
As you can see, there is no other
power connection to the breadboard;
the AxMate board provides the
power connections, as well as the
necessary programming connections.
One tiny board and one cable is all
I’m really pleased with the
AxMate project, and I hope you will
enjoy it as well.
See you next time. NV
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