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docs: Recommend running PID_CALIBRATE in Config_checks.md 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor 2018-03-18 12:43:41 -04:00
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@ -115,6 +115,29 @@ turns in the correct direction. If it does not, see the
troubleshooting tips in the previous section to confirm the troubleshooting tips in the previous section to confirm the
"enable_pin", "step_pin", and "dir_pin" settings for the extruder. "enable_pin", "step_pin", and "dir_pin" settings for the extruder.
### Calibrate PID settings
Klipper supports
[PID control](https://en.wikipedia.org/wiki/PID_controller) for the
extruder and bed heaters. In order to use this control mechanism it is
necessary to calibrate the PID settings on each printer. (PID settings
found in other firmwares or in the example configuration files often
work poorly.)
To calibrate the extruder, navigate to the OctoPrint terminal tab and
run the PID_CALIBRATE command. For example: `PID_CALIBRATE
HEATER=extruder TARGET=170`
At the completion of the tuning test, update the printer.cfg file with
the recommended pid_Kp, pid_Ki, and pid_Kd values.
If the printer has a heated bed and it supports being driven by PWM
(Pulse Width Modulation) then it is recommended to use PID control for
the bed. (When the bed heater is controlled using the PID algorithm it
may turn on and off ten times a second, which may not be suitable for
heaters using a mechanical switch.) A typical bed PID calibration
command is: `PID_CALIBRATE HEATER=heater_bed TARGET=60`
### Next steps ### Next steps
This guide is intended to help with basic verification of pin settings This guide is intended to help with basic verification of pin settings