Serial Relays

[skimask]

Is there any supplement to this manual or other clear examples to shed some light on things like i=i+1?

PBP is PicBasicPro...emphasis on BASIC. There really isn't a supplement to the manual for BASIC, because the whole manual is about BASIC. I can't cite any specific BASIC tutorial other than to Google it and see what you find. Your question on the 'i = i + 1' is reference, albiet indirectly in the manual. i is a variable stored in local memory. = and + are the operators. Whatever is on the right side of the = goes to the left side of the =. Therefore, whatever was in 'i', gets 1 added to it and put back in 'i'.

And your program needs fixing..........

IF relay = 1 THEN outr1 
...............................
IF relay = 12 THEN outr12

Check the PBP manual under branch, save some space and headache

outr1:
IF stat = 1 THEN high1 
LOW 0: GOTO loop 
high1:
HIGH 0:
gosub loop1
low 0: GOTO loop

HIGH 0: will be recognized as a label and not a command, same thing with the rest of the chunks in the rest of the program. You can't have a colon at the end of a line unless it's a label.

IF relay = 1 THEN loop
.............................
IF relay = 12 THEN loop

How about this instead:

IF relay => 0 AND relay <= 12 THEN GOTO LOOP

[T.Jackson]

As Ski pointed out, i is a variable. It's called a variable because, unlike fixed constants it changes. If i is a byte sized variable it can take on any form between (0-255) Whilst if it's a word sized it can be assigned with anything up to 65,536.

When we see something like this:

i = i + 1

It's basically just adding 1 to the existing contents of i. This is referred to as incrementing. So, if i = 100 and we encounter i = i + 1, the new value of i will be 101.

For Next Loops:

FOR i = 1 TO 10
    j = j + 20
NEXT

Strangely enough, more than often we encounter i as a variable within these loops. It could be anything actually. J, K - doesn't matter. FOR NEXT loops will execute the contents between FOR and NEXT a predefined number of times which is set by the numbers after TO minus the numbers after FOR. In the example above, j will have 20 added to it 10 times. The final result of j will be 200 when the loop has finished. However, this assumes that the initial starting value of j was 0.
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