// Uncomment this to enable PID on the bed. It uses the same frequency PWM as the extruder.
// If your PID_dT is the default, and correct for your hardware/configuration, that means 7.689Hz,
// which is fine for driving a square wave into a resistive load and does not significantly impact you FET heating.
// This also works fine on a Fotek SSR-10DA Solid State Relay into a 250W heater.
// If your configuration is significantly different than this and you don't understand the issues involved, you probably
// shouldn't use bed PID until someone else verifies your hardware works.
// If this is enabled, find your own PID constants below.
#define PIDTEMPWATER
//#define WATER_LIMIT_SWITCHING
#define WATER_HYSTERESIS 2 //only disable heating if T<target-WATER_HYSTERESIS and enable heating if T<target+WATER_HYSTERESIS (works only if WATER_LIMIT_SWITCHING is enabled)
#define WATER_CHECK_INTERVAL 5000 //ms between checks in bang-bang control
// This sets the max power delivered to the bed.
// all forms of bed control obey this (PID, bang-bang, bang-bang with hysteresis)
// setting this to anything other than 255 enables a form of PWM to the bed,
// so you shouldn't use it unless you are OK with PWM on your bed. (see the comment on enabling PIDTEMPWATER)
#define MAX_WATER_POWER 255 // limits duty cycle to bed; 255=full current
#define PID_WATER_INTEGRAL_DRIVE_MAX MAX_WATER_POWER // limit for the integral term
// 120v 250W silicone heater into 4mm borosilicate (MendelMax 1.5+)
// from FOPDT model - kp=.39 Tp=405 Tdead=66, Tc set to 79.2, aggressive factor of .15 (vs .1, 1, 10)
#define DEFAULT_waterKp 10.00
#define DEFAULT_waterKi .023
#define DEFAULT_waterKd 305.4
// FIND YOUR OWN: "M303 E-1 C8 S90" to run autotune on the bed at 90 degreesC for 8 cycles.
//#define PID_WATER_DEBUG // Sends debug data to the serial port.
