Macro loop input time delay

[Mcasey]

Hi guys,

I am using a collision detect head on a plasma head and the problem I have is that my proximity sensors are too sensitive, if the head barely touches the smallest bit of dross it stops the machine, I want to make a macro loop that will have a time delay of approx 0.5sec before it sends a signal, this will allow the head to have a small amount of movement before it actives the limit. I have been pulling my hair out trying to do this, can anyone shed some light on how to add a time delay to an input.

[dezsoe]

Do you want to write the macro or just a solution to delay the sensor? If the second then try the Fault signals plugin: it has a delay on the input signal.

[Mcasey]

I would like to write it if possible, I'm trying to learn how to write macros, I've done quite a few simple macros just executing g code, but just can't figure this out

[dezsoe]

OK, then you need to know some basics.
- Your macroloop code will be executed 20 times per second. (In fact, your code is inserted into a loop which ends with a 50 ms delay.) So, you can have a counter which counts the 50 ms loops: 10 will be a half second.
- To use variables that are not recreated in all loop iterations you have to declare them after the #Events code.

Your macroloop should look like this (in pseudo-code, because you want to write it):

Code: Select all

bool inputstate = getled(inputportpin)

if inputstate <> lastinputstate
  // state changed
  if inputstate
    // changed and become active -> reset counter to delay in 50 ms steps
    counter = 10
  // save input state
  lastinputstate = inputstate

if inputstate and counter > 0
  // the input is active and no time-out
  --counter
  if counter = 0
    // timed out
    // do your stuff here

#Events

int counter = 0
bool lastinputstate = false