Joystick Button One-Shot (a.k.a. Rising Edge) Detection

[grosh]

Originally Posted by Alan Anderson

Run that output through another case block controlled by the second button, wiring the value straight through without modification in the False case and wiring the desired "DOWN" motor speed out of the True case. Run that output through the In Range and Coerce select block controlled by the limit switch; I showed an example of that a few posts ago.

Alan- Is this what you are describing?

[Alan Anderson]

Originally Posted by grosh

Alan- Is this what you are describing?

Not quite. I suggest that the motor should be set only once at the end of the process, with just the numeric values that will be set going through the case blocks.

It looks like your ramp runs upward with -1 and downward with +1, so the "down" limit should prevent the value from going positive. Using -1 and 0 as the range limits will let it run upward but not downward when the limit input is active.

(The three "False" cases at the top are just there to show what's going on in the bottom case blocks.)

[grosh]

Thanks for the life-ring. I think I understand how this works now.

Can I ask one more question? Can you explain the logic of the In Range and Coerce for this instance. I have read the context help but don't understand how it works in this instance.

Thanks again!

[Alan Anderson]

Originally Posted by grosh

Can I ask one more question? Can you explain the logic of the In Range and Coerce for this instance. I have read the context help but don't understand how it works in this instance.

In Range and Coerce takes a lower limit, an upper limit, and an input value. It then does two things.

1: It provides an "In Range" boolean output that is True when the value is between the limits, and False when the value is outside the limits. This feature is not used in the code I showed.

2: It provides a "Coerce"d output value that matches the input value when it is inside the limits, but does not exceed the limits in either direction when the input is outside the range. This is how the motor is kept from driving in a particular direction, by making sure the value never goes above 0.