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heater.c: Update link to 'PID without a PhD' Tim Wescott 2000 Embedded article.

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David Forrest 2014-05-09 14:31:06 -04:00 committed by Markus Hitter
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commit 9d5d2a5492
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@ -46,7 +46,7 @@ static const heater_definition_t heaters[NUM_HEATERS] =
The three factors kP, kI, kD are chosen to give the desired behaviour given the dynamics of the system.
See http://www.eetimes.com/design/embedded/4211211/PID-without-a-PhD for the full story
See http://www.embedded.com/design/prototyping-and-development/4211211/PID-without-a-PhD for the full story
*/
struct {
int32_t p_factor; ///< scaled P factor: mibicounts/qc