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heater: Provide symbolic names for pid check_busy (aka M109 / M190) 

Add PID_SETTLE_DELTA and PID_SETTLE_SLOPE constants to the code to try
and make it a little more clear how the wait for temperature code
works.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2018-01-03 10:44:01 -05:00
parent a0b4cdb5c4
commit bba22ab7f0
1 changed files with 5 additions and 1 deletions
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6
klippy/heater.py
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@ -215,6 +215,9 @@ class ControlBangBang:
# Proportional Integral Derivative (PID) control algo
######################################################################
PID_SETTLE_DELTA = 1.
PID_SETTLE_SLOPE = .1
class ControlPID:
def __init__(self, heater, config):
self.heater = heater
@ -255,7 +258,8 @@ class ControlPID:
self.prev_temp_integ = temp_integ
def check_busy(self, eventtime):
temp_diff = self.heater.target_temp - self.heater.last_temp
return abs(temp_diff) > 1. or abs(self.prev_temp_deriv) > 0.1
return (abs(temp_diff) > PID_SETTLE_DELTA
or abs(self.prev_temp_deriv) > PID_SETTLE_SLOPE)
######################################################################