switches in order

Technical Programming
1

Here is a piece of code in PBasic 2.5
IF p1_sw_top=1 AND p2_sw_top=1 then
p1_y=200

This means that at any given time, if p1 switch and p2 switch are pressed together p1_y=200, but here is my question:

Is there a way that you can program so that the switches will have to be pressed in order- first p1 switch and then p2 switch or vice versa- then only p1_y=200???

2

Yes, you can declare a latch or memory bit that is set when the first button is pushed and cleared when the second button is pressed.

Tim Tedrow

3

yes, you can do that very simply, using 2 for, next loops:

sw1:
if p1_sw_top = 1 then sw2
goto endswich

sw2:
if p2_sw_top = 1 then dostuff:
goto endswich

Dostuff:
p1_y = 200

endswich:

the program will process the first loop, then only if that requirement is met, go to the second loop. if the requirement isnt met at either button, or at the second, not the first, it bypasses the dostuff loop ^.^

~Pyro

4

Here’s a bit of code which will do what you want:


'in variable declaration section
seq1_flag VAR bit

'in main loop

'Check 2nd condition first to allow for continuous action, and not just one loop
if p2_sw_top = 1 AND seq1_flag = 1 then run_seq1

'Check first condition
if p1_sw_top = 0 then skip_seq1

'if we got here, condition 1 is true, set flag
seq1_flag = 1
'jump out of sequence loop
goto seq1_done

skip_seq1:
'first condition is not met, clear flag
seq1_flag = 0
'jump out of sequence loop
goto seq1_done

run_seq1:
'both conditions met, set value
p1_y = 200

seq1_done:
'end of sequence loop
5

isnt that overkill?

~Pyro

6

No. The code you posted doesn’t actually take the order you pressed the switches into account. The switch variables don’t get updated until you do a SERIN, so you need a way to keep track of stuff between the loops.

–Rob