On Wed, Aug 15, 2007 at 10:31:49PM +0200, Sven Mueller wrote:
> Hi.
>
> Due to the way our machine drives the axes, we would like to turn off
> the amplpifiers when no axis moves (even when the spindle is on), since
> the steppers get really hot if they don't move but are driven at full
> current.
[...]
The following component can be added to an emc 2.1 system with
"sudo comp --install change_detect.comp", and has an output which is
TRUE when the input is changing.
component change_detect;
pin in float in;
pin out bit out "TRUE if \\fBin\\fR changed since the last run; FALSE
otherwise";
pin out bit out_not "FALSE if \\fBin\\fR changed since the last run; TRUE
otherwise";
option data float;
function _;
;;
MODULE_LICENSE("GPL");
FUNCTION(_) {
float temp = in;
if(data != temp) { out = 1; out_not = 0; }
else { out = 0; out_not = 1; }
data = temp;
}
its behavior when the input is a square wave or a sine wave:
http://emergent.unpy.net/files/sandbox/change-detect-1.png
http://emergent.unpy.net/files/sandbox/change-detect-2.png
Jeff
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