However, it would be extremely
difficult — if not impossible — to use
the above approach to implement
the scan on port C, because the port
Cylon15.bas program. If you read
through the program listing, you’ll see
that I’ve used the PICAXE lookup
command to implement our
scanning. If we were just doing an
eight-LED Cylon Eye on port B, there
are other ways to accomplish the
same thing. For example, consider
the following code snippet:
( tempSerialToPi.bas and
tempSerialFromAx.py) to
communicate with the Pi.
C pins are not in numerical order.
Fortunately, the lookup command
solves this problem. All we need to
do is arrange the values in
parentheses so that they match the
physical order of the port C pins.
for index = 1 to 7
pause abit
outpinsB = outpinsB 2
next index
Implementing an RPi /
RazzPi-LCD / RazzPi- 20
System
If we replaced the first for/next
loop in Cylon15.bas with the above
code, the program would be
functionally identically. We could also
use the same approach to implement
the last for/next loop in Cylon15.bas
as well, by dividing (rather than
multiplying) outpinsB by two.
We don’t have enough space to
include a complete RPi / RazzPi-LCD
With minor changes in the pin
and variable definitions, we could use
those two programs as a starting
point for any PICAXE-Pi project that
uses the RazzPi-LCD and RazzPi- 20
boards. In addition, we could also
combine the functions of this
month’s RazzPi-LCDtoLCD.py
program with the
tempSerialFromAx.py program to
enable the Pi to display the PICAXE
data on the RazzPi-LCD’s external
LCD. Now that I think of it, that’s a
great programming challenge!
/ RazzPi- 20 experiment this month,
and I’m sure some readers wouldn’t
be interested anyway. Also, we’ve
already covered the necessary basics
back in the April 2014 installment of
the Primer. In that article, we used
two 08M2 programs
That’s it for this month. If you’re
interested in the RazzPi boards,
check out the additional information
that’s available on my website. In the
meantime, keep those cards and
letters coming, and have fun! NV
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