Debounce timing

Turnbull2112

I am reading an RCTIME and have a threshold set as a trip point. Example below.


DO

IF time > 5000 THEN
HIGH 5
LOW 6

ENDIF

IF time < 5000 THEN
LOW 5
HIGH 6
GOSUB flash

ENDIF

flash:

HIGH 7
PAUSE 200
LOW 7
PAUSE 200
HIGH 7
PAUSE 200
LOW 7
LOOP UNTIL time > 5000

RETURN

How would I build in a way to delay the trip point·if the process variable fluctuates under/over the setpoint? While maintaining the flasher? Adding hysteresis? Some deadband? Ideas? So far I just keep flickering on and off.

·

Tracy Allen

Turnbull,
I assume that is not a complete program, no? Both IF statements end up executing the flash routine, one because it simply drops through, and the second in a syntax warp of a GOSUB. Check the program flow.

Hysteresis can be arranged with the following kind of statement, which creates a one bit state variable, separate from the measurement itself

tripped  VAR bit
time VAR Word
k VAR Nib
DO
  ' measurement here
  IF time>5100 THEN 
     tripped=0
  ELSEIF time<4900 THEN
     tripped=1
  ENDIF         
  IF tripped THEN
    FOR k=0 to 3
      TOGGLE 7   ' alternately high and low
    NEXT
  ENDIF
LOOP

In the space between 4900 and 5100, the value of tripped retains a value that can be either 0 or 1, depending on the direction of trend.

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Tracy Allen
www.emesystems.com

metron9

You could store the values you receive in a maximum and Minimum variable. Then you would know your parameters. Once you see what you are getting for input you will know what to do.

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Think Inside the box first and if that doesn't work..
Re-arrange what's inside the box then...
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